1026 lines
30 KiB
JavaScript
1026 lines
30 KiB
JavaScript
/*!
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* Dependencies
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*/
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var assert = require('assert');
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var util = require('util');
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var i8n = require('inflection');
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var defineScope = require('./scope.js').defineScope;
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var mergeQuery = require('./scope.js').mergeQuery;
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var ModelBaseClass = require('./model.js');
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exports.Relation = Relation;
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exports.RelationDefinition = RelationDefinition;
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var RelationTypes = {
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belongsTo: 'belongsTo',
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hasMany: 'hasMany',
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hasOne: 'hasOne',
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hasAndBelongsToMany: 'hasAndBelongsToMany'
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};
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exports.RelationTypes = RelationTypes;
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exports.HasMany = HasMany;
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exports.HasManyThrough = HasManyThrough;
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exports.HasOne = HasOne;
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exports.HasAndBelongsToMany = HasAndBelongsToMany;
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exports.BelongsTo = BelongsTo;
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var RelationClasses = {
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belongsTo: BelongsTo,
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hasMany: HasMany,
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hasManyThrough: HasManyThrough,
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hasOne: HasOne,
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hasAndBelongsToMany: HasAndBelongsToMany
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};
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function normalizeType(type) {
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if (!type) {
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return type;
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}
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var t1 = type.toLowerCase();
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for (var t2 in RelationTypes) {
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if (t2.toLowerCase() === t1) {
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return t2;
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}
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}
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return null;
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}
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/**
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* Relation definition class. Use to define relationships between models.
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* @param {Object} definition
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* @class RelationDefinition
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*/
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function RelationDefinition(definition) {
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if (!(this instanceof RelationDefinition)) {
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return new RelationDefinition(definition);
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}
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definition = definition || {};
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this.name = definition.name;
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assert(this.name, 'Relation name is missing');
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this.type = normalizeType(definition.type);
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assert(this.type, 'Invalid relation type: ' + definition.type);
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this.modelFrom = definition.modelFrom;
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assert(this.modelFrom, 'Source model is required');
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this.keyFrom = definition.keyFrom;
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this.modelTo = definition.modelTo;
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assert(this.modelTo, 'Target model is required');
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this.keyTo = definition.keyTo;
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this.modelThrough = definition.modelThrough;
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this.keyThrough = definition.keyThrough;
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this.multiple = (this.type !== 'belongsTo' && this.type !== 'hasOne');
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this.properties = definition.properties || {};
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this.scope = definition.scope;
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}
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RelationDefinition.prototype.toJSON = function () {
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var json = {
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name: this.name,
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type: this.type,
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modelFrom: this.modelFrom.modelName,
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keyFrom: this.keyFrom,
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modelTo: this.modelTo.modelName,
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keyTo: this.keyTo,
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multiple: this.multiple
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};
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if (this.modelThrough) {
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json.modelThrough = this.modelThrough.modelName;
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json.keyThrough = this.keyThrough;
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}
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return json;
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};
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/**
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* Apply the configured scope to the filter/query object.
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* @param {Object} modelInstance
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* @param {Object} filter (where, order, limit, fields, ...)
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*/
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RelationDefinition.prototype.applyScope = function(modelInstance, filter) {
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if (typeof this.scope === 'function') {
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var scope = this.scope.call(this, modelInstance, filter);
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if (typeof scope === 'object') {
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mergeQuery(filter, scope);
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}
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} else if (typeof this.scope === 'object') {
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mergeQuery(filter, this.scope);
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}
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};
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/**
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* Apply the configured properties to the target object.
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* @param {Object} modelInstance
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* @param {Object} target
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*/
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RelationDefinition.prototype.applyProperties = function(modelInstance, target) {
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if (typeof this.properties === 'function') {
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var data = this.properties.call(this, modelInstance);
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for(var k in data) {
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target[k] = data[k];
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}
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} else if (typeof this.properties === 'object') {
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for(var k in this.properties) {
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var key = this.properties[k];
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target[key] = modelInstance[k];
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}
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}
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};
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/**
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* A relation attaching to a given model instance
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* @param {RelationDefinition|Object} definition
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* @param {Object} modelInstance
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* @returns {Relation}
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* @constructor
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* @class Relation
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*/
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function Relation(definition, modelInstance) {
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if (!(this instanceof Relation)) {
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return new Relation(definition, modelInstance);
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}
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if (!(definition instanceof RelationDefinition)) {
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definition = new RelationDefinition(definition);
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}
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this.definition = definition;
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this.modelInstance = modelInstance;
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}
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Relation.prototype.resetCache = function (cache) {
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cache = cache || undefined;
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this.modelInstance.__cachedRelations[this.definition.name] = cache;
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};
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Relation.prototype.getCache = function () {
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return this.modelInstance.__cachedRelations[this.definition.name];
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};
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/**
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* HasMany subclass
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* @param {RelationDefinition|Object} definition
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* @param {Object} modelInstance
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* @returns {HasMany}
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* @constructor
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* @class HasMany
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*/
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function HasMany(definition, modelInstance) {
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if (!(this instanceof HasMany)) {
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return new HasMany(definition, modelInstance);
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}
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assert(definition.type === RelationTypes.hasMany);
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Relation.apply(this, arguments);
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}
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util.inherits(HasMany, Relation);
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HasMany.prototype.removeFromCache = function (id) {
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var cache = this.modelInstance.__cachedRelations[this.definition.name];
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var idName = this.definition.modelTo.definition.idName();
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if (Array.isArray(cache)) {
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for (var i = 0, n = cache.length; i < n; i++) {
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if (cache[i][idName] === id) {
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return cache.splice(i, 1);
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}
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}
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}
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return null;
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};
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HasMany.prototype.addToCache = function (inst) {
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if (!inst) {
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return;
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}
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var cache = this.modelInstance.__cachedRelations[this.definition.name];
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if (cache === undefined) {
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cache = this.modelInstance.__cachedRelations[this.definition.name] = [];
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}
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var idName = this.definition.modelTo.definition.idName();
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if (Array.isArray(cache)) {
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for (var i = 0, n = cache.length; i < n; i++) {
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if (cache[i][idName] === inst[idName]) {
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cache[i] = inst;
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return;
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}
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}
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cache.push(inst);
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}
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};
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/**
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* HasManyThrough subclass
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* @param {RelationDefinition|Object} definition
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* @param {Object} modelInstance
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* @returns {HasManyThrough}
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* @constructor
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* @class HasManyThrough
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*/
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function HasManyThrough(definition, modelInstance) {
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if (!(this instanceof HasManyThrough)) {
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return new HasManyThrough(definition, modelInstance);
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}
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assert(definition.type === RelationTypes.hasMany);
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assert(definition.modelThrough);
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HasMany.apply(this, arguments);
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}
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util.inherits(HasManyThrough, HasMany);
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/**
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* BelongsTo subclass
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* @param {RelationDefinition|Object} definition
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* @param {Object} modelInstance
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* @returns {BelongsTo}
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* @constructor
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* @class BelongsTo
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*/
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function BelongsTo(definition, modelInstance) {
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if (!(this instanceof BelongsTo)) {
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return new BelongsTo(definition, modelInstance);
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}
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assert(definition.type === RelationTypes.belongsTo);
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Relation.apply(this, arguments);
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}
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util.inherits(BelongsTo, Relation);
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/**
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* HasAndBelongsToMany subclass
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* @param {RelationDefinition|Object} definition
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* @param {Object} modelInstance
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* @returns {HasAndBelongsToMany}
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* @constructor
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* @class HasAndBelongsToMany
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*/
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function HasAndBelongsToMany(definition, modelInstance) {
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if (!(this instanceof HasAndBelongsToMany)) {
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return new HasAndBelongsToMany(definition, modelInstance);
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}
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assert(definition.type === RelationTypes.hasAndBelongsToMany);
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Relation.apply(this, arguments);
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}
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util.inherits(HasAndBelongsToMany, Relation);
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/**
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* HasOne subclass
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* @param {RelationDefinition|Object} definition
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* @param {Object} modelInstance
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* @returns {HasOne}
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* @constructor
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* @class HasOne
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*/
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function HasOne(definition, modelInstance) {
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if (!(this instanceof HasOne)) {
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return new HasOne(definition, modelInstance);
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}
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assert(definition.type === RelationTypes.hasOne);
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Relation.apply(this, arguments);
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}
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util.inherits(HasOne, Relation);
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/*!
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* Find the relation by foreign key
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* @param {*} foreignKey The foreign key
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* @returns {Object} The relation object
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*/
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function findBelongsTo(modelFrom, modelTo, keyTo) {
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var relations = modelFrom.relations;
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var keys = Object.keys(relations);
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for (var k = 0; k < keys.length; k++) {
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var rel = relations[keys[k]];
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if (rel.type === RelationTypes.belongsTo &&
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rel.modelTo === modelTo &&
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(keyTo === undefined || rel.keyTo === keyTo)) {
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return rel.keyFrom;
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}
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}
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return null;
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}
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/*!
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* Look up a model by name from the list of given models
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* @param {Object} models Models keyed by name
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* @param {String} modelName The model name
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* @returns {*} The matching model class
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*/
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function lookupModel(models, modelName) {
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if(models[modelName]) {
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return models[modelName];
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}
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var lookupClassName = modelName.toLowerCase();
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for (var name in models) {
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if (name.toLowerCase() === lookupClassName) {
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return models[name];
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}
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}
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}
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/**
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* Define a "one to many" relationship by specifying the model name
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*
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* Examples:
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* ```
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* User.hasMany(Post, {as: 'posts', foreignKey: 'authorId'});
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* ```
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*
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* ```
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* Book.hasMany(Chapter);
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* ```
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* Or, equivalently:
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* ```
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* Book.hasMany('chapters', {model: Chapter});
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* ```
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* @param {Model} modelFrom Source model class
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* @param {Object|String} modelTo Model object (or String name of model) to which you are creating the relationship.
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* @options {Object} params Configuration parameters; see below.
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* @property {String} as Name of the property in the referring model that corresponds to the foreign key field in the related model.
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* @property {String} foreignKey Property name of foreign key field.
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* @property {Object} model Model object
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*/
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RelationDefinition.hasMany = function hasMany(modelFrom, modelTo, params) {
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var thisClassName = modelFrom.modelName;
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params = params || {};
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if (typeof modelTo === 'string') {
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params.as = modelTo;
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if (params.model) {
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modelTo = params.model;
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} else {
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var modelToName = i8n.singularize(modelTo).toLowerCase();
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modelTo = lookupModel(modelFrom.dataSource.modelBuilder.models, modelToName);
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}
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}
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var relationName = params.as || i8n.camelize(modelTo.pluralModelName, true);
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var fk = params.foreignKey || i8n.camelize(thisClassName + '_id', true);
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var idName = modelFrom.dataSource.idName(modelFrom.modelName) || 'id';
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var definition = new RelationDefinition({
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name: relationName,
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type: RelationTypes.hasMany,
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modelFrom: modelFrom,
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keyFrom: idName,
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keyTo: fk,
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modelTo: modelTo,
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multiple: true,
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properties: params.properties,
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scope: params.scope
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});
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if (params.through) {
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definition.modelThrough = params.through;
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var keyThrough = definition.throughKey || i8n.camelize(modelTo.modelName + '_id', true);
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definition.keyThrough = keyThrough;
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}
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modelFrom.relations[relationName] = definition;
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if (!params.through) {
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// obviously, modelTo should have attribute called `fk`
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modelTo.dataSource.defineForeignKey(modelTo.modelName, fk, modelFrom.modelName);
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}
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var scopeMethods = {
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findById: scopeMethod(definition, 'findById'),
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destroy: scopeMethod(definition, 'destroyById')
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}
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if(definition.modelThrough) {
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scopeMethods.create = scopeMethod(definition, 'create');
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scopeMethods.add = scopeMethod(definition, 'add');
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scopeMethods.remove = scopeMethod(definition, 'remove');
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} else {
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scopeMethods.create = scopeMethod(definition, 'create');
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scopeMethods.build = scopeMethod(definition, 'build');
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}
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// Mix the property and scoped methods into the prototype class
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defineScope(modelFrom.prototype, params.through || modelTo, relationName, function () {
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var filter = {};
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filter.where = {};
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filter.where[fk] = this[idName];
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definition.applyScope(this, filter);
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if (params.through) {
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filter.collect = i8n.camelize(modelTo.modelName, true);
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filter.include = filter.collect;
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}
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return filter;
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}, scopeMethods);
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};
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function scopeMethod(definition, methodName) {
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var method = function () {
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var relationClass = RelationClasses[definition.type];
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if (definition.type === RelationTypes.hasMany && definition.modelThrough) {
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relationClass = RelationClasses.hasManyThrough;
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}
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var relation = new relationClass(definition, this);
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return relation[methodName].apply(relation, arguments);
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};
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return method;
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}
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HasMany.prototype.findById = function (id, cb) {
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var modelTo = this.definition.modelTo;
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var fk = this.definition.keyTo;
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var pk = this.definition.keyFrom;
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var modelInstance = this.modelInstance;
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var idName = this.definition.modelTo.definition.idName();
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var filter = {};
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filter.where = {};
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filter.where[idName] = id;
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filter.where[fk] = modelInstance[pk];
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this.definition.applyScope(modelInstance, filter);
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modelTo.findOne(filter, function (err, inst) {
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if (err) {
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return cb(err);
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}
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if (!inst) {
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return cb(new Error('Not found'));
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}
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cb(null, inst);
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});
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};
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HasMany.prototype.destroyById = function (id, cb) {
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var self = this;
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this.findById(id, function(err, inst) {
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if (err) {
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return cb(err);
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}
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self.removeFromCache(inst[fk]);
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inst.destroy(cb);
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});
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};
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// Create an instance of the target model and connect it to the instance of
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// the source model by creating an instance of the through model
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HasManyThrough.prototype.create = function create(data, done) {
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var self = this;
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var definition = this.definition;
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var modelTo = definition.modelTo;
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var modelThrough = definition.modelThrough;
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if (typeof data === 'function' && !done) {
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done = data;
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data = {};
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}
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var modelInstance = this.modelInstance;
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// First create the target model
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modelTo.create(data, function (err, to) {
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if (err) {
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return done && done(err, to);
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}
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// The primary key for the target model
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var pk2 = definition.modelTo.definition.idName();
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var fk1 = findBelongsTo(modelThrough, definition.modelFrom,
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definition.keyFrom);
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var fk2 = findBelongsTo(modelThrough, definition.modelTo, pk2);
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var d = {};
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d[fk1] = modelInstance[definition.keyFrom];
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d[fk2] = to[pk2];
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definition.applyProperties(modelInstance, d);
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// Then create the through model
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modelThrough.create(d, function (e, through) {
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if (e) {
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// Undo creation of the target model
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to.destroy(function () {
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done && done(e);
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});
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} else {
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self.addToCache(to);
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done && done(err, to);
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}
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});
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});
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};
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|
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/**
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* Add the target model instance to the 'hasMany' relation
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* @param {Object|ID} acInst The actual instance or id value
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*/
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HasManyThrough.prototype.add = function (acInst, done) {
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var self = this;
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var definition = this.definition;
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var modelThrough = definition.modelThrough;
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var pk1 = definition.keyFrom;
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var data = {};
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var query = {};
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var fk1 = findBelongsTo(modelThrough, definition.modelFrom,
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definition.keyFrom);
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// The primary key for the target model
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var pk2 = definition.modelTo.definition.idName();
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var fk2 = findBelongsTo(modelThrough, definition.modelTo, pk2);
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query[fk1] = this.modelInstance[pk1];
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query[fk2] = acInst[pk2] || acInst;
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var filter = { where: query };
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definition.applyScope(this.modelInstance, filter);
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data[fk1] = this.modelInstance[pk1];
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data[fk2] = acInst[pk2] || acInst;
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definition.applyProperties(this.modelInstance, data);
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// Create an instance of the through model
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modelThrough.findOrCreate(filter, data, function(err, ac) {
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if(!err) {
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if (acInst instanceof definition.modelTo) {
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self.addToCache(acInst);
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}
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}
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done(err, ac);
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});
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};
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/**
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* Remove the target model instance from the 'hasMany' relation
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* @param {Object|ID) acInst The actual instance or id value
|
|
*/
|
|
HasManyThrough.prototype.remove = function (acInst, done) {
|
|
var self = this;
|
|
var definition = this.definition;
|
|
var modelThrough = definition.modelThrough;
|
|
var pk1 = definition.keyFrom;
|
|
|
|
var query = {};
|
|
|
|
var fk1 = findBelongsTo(modelThrough, definition.modelFrom,
|
|
definition.keyFrom);
|
|
|
|
// The primary key for the target model
|
|
var pk2 = definition.modelTo.definition.idName();
|
|
|
|
var fk2 = findBelongsTo(modelThrough, definition.modelTo, pk2);
|
|
|
|
query[fk1] = this.modelInstance[pk1];
|
|
query[fk2] = acInst[pk2] || acInst;
|
|
|
|
var filter = { where: query };
|
|
|
|
definition.applyScope(this.modelInstance, filter);
|
|
|
|
modelThrough.deleteAll(filter.where, function (err) {
|
|
if (!err) {
|
|
self.removeFromCache(query[fk2]);
|
|
}
|
|
done(err);
|
|
});
|
|
};
|
|
|
|
|
|
/**
|
|
* Declare "belongsTo" relation that sets up a one-to-one connection with
|
|
* another model, such that each instance of the declaring model "belongs to"
|
|
* one instance of the other model.
|
|
*
|
|
* For example, if an application includes users and posts, and each post can
|
|
* be written by exactly one user. The following code specifies that `Post` has
|
|
* a reference called `author` to the `User` model via the `userId` property of
|
|
* `Post` as the foreign key.
|
|
* ```
|
|
* Post.belongsTo(User, {as: 'author', foreignKey: 'userId'});
|
|
* ```
|
|
*
|
|
* This optional parameter default value is false, so the related object will
|
|
* be loaded from cache if available.
|
|
*
|
|
* @param {Class|String} modelTo Model object (or String name of model) to
|
|
* which you are creating the relationship.
|
|
* @options {Object} params Configuration parameters; see below.
|
|
* @property {String} as Name of the property in the referring model that
|
|
* corresponds to the foreign key field in the related model.
|
|
* @property {String} foreignKey Name of foreign key property.
|
|
*
|
|
*/
|
|
RelationDefinition.belongsTo = function (modelFrom, modelTo, params) {
|
|
params = params || {};
|
|
if ('string' === typeof modelTo) {
|
|
params.as = modelTo;
|
|
if (params.model) {
|
|
modelTo = params.model;
|
|
} else {
|
|
var modelToName = modelTo.toLowerCase();
|
|
modelTo = lookupModel(modelFrom.dataSource.modelBuilder.models, modelToName);
|
|
}
|
|
}
|
|
|
|
var idName = modelFrom.dataSource.idName(modelTo.modelName) || 'id';
|
|
var relationName = params.as || i8n.camelize(modelTo.modelName, true);
|
|
var fk = params.foreignKey || relationName + 'Id';
|
|
|
|
var relationDef = modelFrom.relations[relationName] = new RelationDefinition({
|
|
name: relationName,
|
|
type: RelationTypes.belongsTo,
|
|
modelFrom: modelFrom,
|
|
keyFrom: fk,
|
|
keyTo: idName,
|
|
modelTo: modelTo
|
|
});
|
|
|
|
modelFrom.dataSource.defineForeignKey(modelFrom.modelName, fk, modelTo.modelName);
|
|
|
|
// Define a property for the scope so that we have 'this' for the scoped methods
|
|
Object.defineProperty(modelFrom.prototype, relationName, {
|
|
enumerable: true,
|
|
configurable: true,
|
|
get: function() {
|
|
var relation = new BelongsTo(relationDef, this);
|
|
var relationMethod = relation.related.bind(relation);
|
|
relationMethod.create = relation.create.bind(relation);
|
|
relationMethod.build = relation.build.bind(relation);
|
|
relationMethod._targetClass = relationDef.modelTo.modelName;
|
|
return relationMethod;
|
|
}
|
|
});
|
|
|
|
// Wrap the property into a function for remoting
|
|
// so that it can be accessed as /api/<model>/<id>/<belongsToRelationName>
|
|
// For example, /api/orders/1/customer
|
|
var fn = function() {
|
|
var f = this[relationName];
|
|
f.apply(this, arguments);
|
|
};
|
|
|
|
fn.shared = true;
|
|
fn.http = {verb: 'get', path: '/' + relationName};
|
|
fn.accepts = {arg: 'refresh', type: 'boolean', http: {source: 'query'}};
|
|
fn.description = 'Fetches belongsTo relation ' + relationName;
|
|
fn.returns = {arg: relationName, type: 'object', root: true};
|
|
|
|
modelFrom.prototype['__get__' + relationName] = fn;
|
|
};
|
|
|
|
BelongsTo.prototype.create = function(targetModelData, cb) {
|
|
var self = this;
|
|
var modelTo = this.definition.modelTo;
|
|
var fk = this.definition.keyTo;
|
|
var pk = this.definition.keyFrom;
|
|
var modelInstance = this.modelInstance;
|
|
|
|
if (typeof targetModelData === 'function' && !cb) {
|
|
cb = targetModelData;
|
|
targetModelData = {};
|
|
}
|
|
|
|
modelTo.create(targetModelData, function(err, targetModel) {
|
|
if(!err) {
|
|
modelInstance[fk] = targetModel[pk];
|
|
self.resetCache(targetModel);
|
|
cb && cb(err, targetModel);
|
|
} else {
|
|
cb && cb(err);
|
|
}
|
|
});
|
|
};
|
|
|
|
BelongsTo.prototype.build = function(targetModelData) {
|
|
var modelTo = this.definition.modelTo;
|
|
return new modelTo(targetModelData);
|
|
};
|
|
|
|
/**
|
|
* Define the method for the belongsTo relation itself
|
|
* It will support one of the following styles:
|
|
* - order.customer(refresh, callback): Load the target model instance asynchronously
|
|
* - order.customer(customer): Synchronous setter of the target model instance
|
|
* - order.customer(): Synchronous getter of the target model instance
|
|
*
|
|
* @param refresh
|
|
* @param params
|
|
* @returns {*}
|
|
*/
|
|
BelongsTo.prototype.related = function (refresh, params) {
|
|
var self = this;
|
|
var modelTo = this.definition.modelTo;
|
|
var pk = this.definition.keyTo;
|
|
var fk = this.definition.keyFrom;
|
|
var modelInstance = this.modelInstance;
|
|
|
|
if (arguments.length === 1) {
|
|
params = refresh;
|
|
refresh = false;
|
|
} else if (arguments.length > 2) {
|
|
throw new Error('Method can\'t be called with more than two arguments');
|
|
}
|
|
|
|
var cachedValue;
|
|
if (!refresh) {
|
|
cachedValue = self.getCache();
|
|
}
|
|
if (params instanceof ModelBaseClass) { // acts as setter
|
|
modelInstance[fk] = params[pk];
|
|
self.resetCache(params);
|
|
} else if (typeof params === 'function') { // acts as async getter
|
|
var cb = params;
|
|
if (cachedValue === undefined) {
|
|
modelTo.findById(modelInstance[fk], function (err, inst) {
|
|
if (err) {
|
|
return cb(err);
|
|
}
|
|
if (!inst) {
|
|
return cb(null, null);
|
|
}
|
|
// Check if the foreign key matches the primary key
|
|
if (inst[pk] === modelInstance[fk]) {
|
|
self.resetCache(inst);
|
|
cb(null, inst);
|
|
} else {
|
|
cb(new Error('Permission denied: foreign key does not match the primary key'));
|
|
}
|
|
});
|
|
return modelInstance[fk];
|
|
} else {
|
|
cb(null, cachedValue);
|
|
return cachedValue;
|
|
}
|
|
} else if (params === undefined) { // acts as sync getter
|
|
return cachedValue;
|
|
} else { // setter
|
|
modelInstance[fk] = params;
|
|
self.resetCache();
|
|
}
|
|
};
|
|
|
|
/**
|
|
* A hasAndBelongsToMany relation creates a direct many-to-many connection with
|
|
* another model, with no intervening model. For example, if your application
|
|
* includes users and groups, with each group having many users and each user
|
|
* appearing in many groups, you could declare the models this way:
|
|
* ```
|
|
* User.hasAndBelongsToMany('groups', {model: Group, foreignKey: 'groupId'});
|
|
* ```
|
|
*
|
|
* @param {String|Object} modelTo Model object (or String name of model) to
|
|
* which you are creating the relationship.
|
|
* @options {Object} params Configuration parameters; see below.
|
|
* @property {String} as Name of the property in the referring model that
|
|
* corresponds to the foreign key field in the related model.
|
|
* @property {String} foreignKey Property name of foreign key field.
|
|
* @property {Object} model Model object
|
|
*/
|
|
RelationDefinition.hasAndBelongsToMany = function hasAndBelongsToMany(modelFrom, modelTo, params) {
|
|
params = params || {};
|
|
var models = modelFrom.dataSource.modelBuilder.models;
|
|
|
|
if ('string' === typeof modelTo) {
|
|
params.as = modelTo;
|
|
if (params.model) {
|
|
modelTo = params.model;
|
|
} else {
|
|
modelTo = lookupModel(models, i8n.singularize(modelTo)) ||
|
|
modelTo;
|
|
}
|
|
if (typeof modelTo === 'string') {
|
|
throw new Error('Could not find "' + modelTo + '" relation for ' + modelFrom.modelName);
|
|
}
|
|
}
|
|
|
|
if (!params.through) {
|
|
var name1 = modelFrom.modelName + modelTo.modelName;
|
|
var name2 = modelTo.modelName + modelFrom.modelName;
|
|
params.through = lookupModel(models, name1) || lookupModel(models, name2) ||
|
|
modelFrom.dataSource.define(name1);
|
|
}
|
|
params.through.belongsTo(modelFrom);
|
|
params.through.belongsTo(modelTo);
|
|
|
|
this.hasMany(modelFrom, modelTo, {as: params.as, through: params.through});
|
|
|
|
};
|
|
|
|
/**
|
|
* A HasOne relation creates a one-to-one connection from modelFrom to modelTo.
|
|
* This relation indicates that each instance of a model contains or possesses
|
|
* one instance of another model. For example, each supplier in your application
|
|
* has only one account.
|
|
*
|
|
* @param {Function} modelFrom The declaring model class
|
|
* @param {String|Function} modelTo Model object (or String name of model) to
|
|
* which you are creating the relationship.
|
|
* @options {Object} params Configuration parameters; see below.
|
|
* @property {String} as Name of the property in the referring model that
|
|
* corresponds to the foreign key field in the related model.
|
|
* @property {String} foreignKey Property name of foreign key field.
|
|
* @property {Object} model Model object
|
|
*/
|
|
RelationDefinition.hasOne = function (modelFrom, modelTo, params) {
|
|
params = params || {};
|
|
if ('string' === typeof modelTo) {
|
|
params.as = modelTo;
|
|
if (params.model) {
|
|
modelTo = params.model;
|
|
} else {
|
|
var modelToName = modelTo.toLowerCase();
|
|
modelTo = lookupModel(modelFrom.dataSource.modelBuilder.models, modelToName);
|
|
}
|
|
}
|
|
|
|
var pk = modelFrom.dataSource.idName(modelTo.modelName) || 'id';
|
|
var relationName = params.as || i8n.camelize(modelTo.modelName, true);
|
|
|
|
var fk = params.foreignKey || i8n.camelize(modelFrom.modelName + '_id', true);
|
|
|
|
var relationDef = modelFrom.relations[relationName] = new RelationDefinition({
|
|
name: relationName,
|
|
type: RelationTypes.hasOne,
|
|
modelFrom: modelFrom,
|
|
keyFrom: pk,
|
|
keyTo: fk,
|
|
modelTo: modelTo,
|
|
properties: params.properties
|
|
});
|
|
|
|
modelFrom.dataSource.defineForeignKey(modelTo.modelName, fk, modelFrom.modelName);
|
|
|
|
// Define a property for the scope so that we have 'this' for the scoped methods
|
|
Object.defineProperty(modelFrom.prototype, relationName, {
|
|
enumerable: true,
|
|
configurable: true,
|
|
get: function() {
|
|
var relation = new HasOne(relationDef, this);
|
|
var relationMethod = relation.related.bind(relation)
|
|
relationMethod.create = relation.create.bind(relation);
|
|
relationMethod.build = relation.build.bind(relation);
|
|
return relationMethod;
|
|
}
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Create a target model instance
|
|
* @param {Object} targetModelData The target model data
|
|
* @callback {Function} [cb] Callback function
|
|
* @param {String|Object} err Error string or object
|
|
* @param {Object} The newly created target model instance
|
|
*/
|
|
HasOne.prototype.create = function (targetModelData, cb) {
|
|
var self = this;
|
|
var modelTo = this.definition.modelTo;
|
|
var fk = this.definition.keyTo;
|
|
var pk = this.definition.keyFrom;
|
|
var modelInstance = this.modelInstance;
|
|
|
|
if (typeof targetModelData === 'function' && !cb) {
|
|
cb = targetModelData;
|
|
targetModelData = {};
|
|
}
|
|
targetModelData = targetModelData || {};
|
|
targetModelData[fk] = modelInstance[pk];
|
|
var query = {where: {}};
|
|
query.where[fk] = targetModelData[fk];
|
|
|
|
this.definition.applyScope(modelInstance, query);
|
|
this.definition.applyProperties(modelInstance, targetModelData);
|
|
|
|
modelTo.findOne(query, function(err, result) {
|
|
if(err) {
|
|
cb(err);
|
|
} else if(result) {
|
|
cb(new Error('HasOne relation cannot create more than one instance of '
|
|
+ modelTo.modelName));
|
|
} else {
|
|
modelTo.create(targetModelData, function (err, targetModel) {
|
|
if (!err) {
|
|
// Refresh the cache
|
|
self.resetCache(targetModel);
|
|
cb && cb(err, targetModel);
|
|
} else {
|
|
cb && cb(err);
|
|
}
|
|
});
|
|
}
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Create a target model instance
|
|
* @param {Object} targetModelData The target model data
|
|
* @callback {Function} [cb] Callback function
|
|
* @param {String|Object} err Error string or object
|
|
* @param {Object} The newly created target model instance
|
|
*/
|
|
HasMany.prototype.create = function (targetModelData, cb) {
|
|
var self = this;
|
|
var modelTo = this.definition.modelTo;
|
|
var fk = this.definition.keyTo;
|
|
var pk = this.definition.keyFrom;
|
|
var modelInstance = this.modelInstance;
|
|
|
|
if (typeof targetModelData === 'function' && !cb) {
|
|
cb = targetModelData;
|
|
targetModelData = {};
|
|
}
|
|
targetModelData = targetModelData || {};
|
|
targetModelData[fk] = modelInstance[pk];
|
|
|
|
this.definition.applyProperties(modelInstance, targetModelData);
|
|
|
|
modelTo.create(targetModelData, function(err, targetModel) {
|
|
if(!err) {
|
|
// Refresh the cache
|
|
self.addToCache(targetModel);
|
|
cb && cb(err, targetModel);
|
|
} else {
|
|
cb && cb(err);
|
|
}
|
|
});
|
|
};
|
|
/**
|
|
* Build a target model instance
|
|
* @param {Object} targetModelData The target model data
|
|
* @returns {Object} The newly built target model instance
|
|
*/
|
|
HasMany.prototype.build = HasOne.prototype.build = function(targetModelData) {
|
|
var modelTo = this.definition.modelTo;
|
|
var pk = this.definition.keyFrom;
|
|
var fk = this.definition.keyTo;
|
|
|
|
targetModelData = targetModelData || {};
|
|
targetModelData[fk] = this.modelInstance[pk];
|
|
|
|
this.definition.applyProperties(this.modelInstance, targetModelData);
|
|
|
|
return new modelTo(targetModelData);
|
|
};
|
|
|
|
/**
|
|
* Define the method for the hasOne relation itself
|
|
* It will support one of the following styles:
|
|
* - order.customer(refresh, callback): Load the target model instance asynchronously
|
|
* - order.customer(customer): Synchronous setter of the target model instance
|
|
* - order.customer(): Synchronous getter of the target model instance
|
|
*
|
|
* @param {Boolean} refresh Reload from the data source
|
|
* @param {Object|Function} params Query parameters
|
|
* @returns {Object}
|
|
*/
|
|
HasOne.prototype.related = function (refresh, params) {
|
|
var self = this;
|
|
var modelTo = this.definition.modelTo;
|
|
var fk = this.definition.keyTo;
|
|
var pk = this.definition.keyFrom;
|
|
var definition = this.definition;
|
|
var modelInstance = this.modelInstance;
|
|
|
|
if (arguments.length === 1) {
|
|
params = refresh;
|
|
refresh = false;
|
|
} else if (arguments.length > 2) {
|
|
throw new Error('Method can\'t be called with more than two arguments');
|
|
}
|
|
|
|
var cachedValue;
|
|
if (!refresh) {
|
|
cachedValue = self.getCache();
|
|
}
|
|
if (params instanceof ModelBaseClass) { // acts as setter
|
|
params[fk] = modelInstance[pk];
|
|
self.resetCache(params);
|
|
} else if (typeof params === 'function') { // acts as async getter
|
|
var cb = params;
|
|
if (cachedValue === undefined) {
|
|
var query = {where: {}};
|
|
query.where[fk] = modelInstance[pk];
|
|
definition.applyScope(modelInstance, query);
|
|
modelTo.findOne(query, function (err, inst) {
|
|
if (err) {
|
|
return cb(err);
|
|
}
|
|
if (!inst) {
|
|
return cb(null, null);
|
|
}
|
|
// Check if the foreign key matches the primary key
|
|
if (inst[fk] === modelInstance[pk]) {
|
|
self.resetCache(inst);
|
|
cb(null, inst);
|
|
} else {
|
|
cb(new Error('Permission denied'));
|
|
}
|
|
});
|
|
return modelInstance[pk];
|
|
} else {
|
|
cb(null, cachedValue);
|
|
return cachedValue;
|
|
}
|
|
} else if (params === undefined) { // acts as sync getter
|
|
return cachedValue;
|
|
} else { // setter
|
|
params[fk] = modelInstance[pk];
|
|
self.resetCache();
|
|
}
|
|
};
|