1232 lines
37 KiB
JavaScript
1232 lines
37 KiB
JavaScript
/*!
|
|
* Dependencies
|
|
*/
|
|
var assert = require('assert');
|
|
var util = require('util');
|
|
var i8n = require('inflection');
|
|
var defineScope = require('./scope.js').defineScope;
|
|
var mergeQuery = require('./scope.js').mergeQuery;
|
|
var ModelBaseClass = require('./model.js');
|
|
|
|
exports.Relation = Relation;
|
|
exports.RelationDefinition = RelationDefinition;
|
|
|
|
var RelationTypes = {
|
|
belongsTo: 'belongsTo',
|
|
hasMany: 'hasMany',
|
|
hasOne: 'hasOne',
|
|
hasAndBelongsToMany: 'hasAndBelongsToMany'
|
|
};
|
|
|
|
exports.RelationTypes = RelationTypes;
|
|
exports.HasMany = HasMany;
|
|
exports.HasManyThrough = HasManyThrough;
|
|
exports.HasOne = HasOne;
|
|
exports.HasAndBelongsToMany = HasAndBelongsToMany;
|
|
exports.BelongsTo = BelongsTo;
|
|
|
|
var RelationClasses = {
|
|
belongsTo: BelongsTo,
|
|
hasMany: HasMany,
|
|
hasManyThrough: HasManyThrough,
|
|
hasOne: HasOne,
|
|
hasAndBelongsToMany: HasAndBelongsToMany
|
|
};
|
|
|
|
function normalizeType(type) {
|
|
if (!type) {
|
|
return type;
|
|
}
|
|
var t1 = type.toLowerCase();
|
|
for (var t2 in RelationTypes) {
|
|
if (t2.toLowerCase() === t1) {
|
|
return t2;
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Relation definition class. Use to define relationships between models.
|
|
* @param {Object} definition
|
|
* @class RelationDefinition
|
|
*/
|
|
function RelationDefinition(definition) {
|
|
if (!(this instanceof RelationDefinition)) {
|
|
return new RelationDefinition(definition);
|
|
}
|
|
definition = definition || {};
|
|
this.name = definition.name;
|
|
assert(this.name, 'Relation name is missing');
|
|
this.type = normalizeType(definition.type);
|
|
assert(this.type, 'Invalid relation type: ' + definition.type);
|
|
this.modelFrom = definition.modelFrom;
|
|
assert(this.modelFrom, 'Source model is required');
|
|
this.keyFrom = definition.keyFrom;
|
|
this.modelTo = definition.modelTo;
|
|
assert(this.modelTo, 'Target model is required');
|
|
this.keyTo = definition.keyTo;
|
|
this.modelThrough = definition.modelThrough;
|
|
this.keyThrough = definition.keyThrough;
|
|
this.multiple = (this.type !== 'belongsTo' && this.type !== 'hasOne');
|
|
this.properties = definition.properties || {};
|
|
this.options = definition.options || {};
|
|
this.scope = definition.scope;
|
|
}
|
|
|
|
RelationDefinition.prototype.toJSON = function () {
|
|
var json = {
|
|
name: this.name,
|
|
type: this.type,
|
|
modelFrom: this.modelFrom.modelName,
|
|
keyFrom: this.keyFrom,
|
|
modelTo: this.modelTo.modelName,
|
|
keyTo: this.keyTo,
|
|
multiple: this.multiple
|
|
};
|
|
if (this.modelThrough) {
|
|
json.modelThrough = this.modelThrough.modelName;
|
|
json.keyThrough = this.keyThrough;
|
|
}
|
|
return json;
|
|
};
|
|
|
|
/**
|
|
* Apply the configured scope to the filter/query object.
|
|
* @param {Object} modelInstance
|
|
* @param {Object} filter (where, order, limit, fields, ...)
|
|
*/
|
|
RelationDefinition.prototype.applyScope = function(modelInstance, filter) {
|
|
if (typeof this.scope === 'function') {
|
|
var scope = this.scope.call(this, modelInstance, filter);
|
|
if (typeof scope === 'object') {
|
|
mergeQuery(filter, scope);
|
|
}
|
|
} else if (typeof this.scope === 'object') {
|
|
mergeQuery(filter, this.scope);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Apply the configured properties to the target object.
|
|
* @param {Object} modelInstance
|
|
* @param {Object} target
|
|
*/
|
|
RelationDefinition.prototype.applyProperties = function(modelInstance, target) {
|
|
if (typeof this.properties === 'function') {
|
|
var data = this.properties.call(this, modelInstance);
|
|
for(var k in data) {
|
|
target[k] = data[k];
|
|
}
|
|
} else if (typeof this.properties === 'object') {
|
|
for(var k in this.properties) {
|
|
var key = this.properties[k];
|
|
target[key] = modelInstance[k];
|
|
}
|
|
}
|
|
};
|
|
|
|
/**
|
|
* A relation attaching to a given model instance
|
|
* @param {RelationDefinition|Object} definition
|
|
* @param {Object} modelInstance
|
|
* @returns {Relation}
|
|
* @constructor
|
|
* @class Relation
|
|
*/
|
|
function Relation(definition, modelInstance) {
|
|
if (!(this instanceof Relation)) {
|
|
return new Relation(definition, modelInstance);
|
|
}
|
|
if (!(definition instanceof RelationDefinition)) {
|
|
definition = new RelationDefinition(definition);
|
|
}
|
|
this.definition = definition;
|
|
this.modelInstance = modelInstance;
|
|
}
|
|
|
|
Relation.prototype.resetCache = function (cache) {
|
|
cache = cache || undefined;
|
|
this.modelInstance.__cachedRelations[this.definition.name] = cache;
|
|
};
|
|
|
|
Relation.prototype.getCache = function () {
|
|
return this.modelInstance.__cachedRelations[this.definition.name];
|
|
};
|
|
|
|
/**
|
|
* HasMany subclass
|
|
* @param {RelationDefinition|Object} definition
|
|
* @param {Object} modelInstance
|
|
* @returns {HasMany}
|
|
* @constructor
|
|
* @class HasMany
|
|
*/
|
|
function HasMany(definition, modelInstance) {
|
|
if (!(this instanceof HasMany)) {
|
|
return new HasMany(definition, modelInstance);
|
|
}
|
|
assert(definition.type === RelationTypes.hasMany);
|
|
Relation.apply(this, arguments);
|
|
}
|
|
|
|
util.inherits(HasMany, Relation);
|
|
|
|
HasMany.prototype.removeFromCache = function (id) {
|
|
var cache = this.modelInstance.__cachedRelations[this.definition.name];
|
|
var idName = this.definition.modelTo.definition.idName();
|
|
if (Array.isArray(cache)) {
|
|
for (var i = 0, n = cache.length; i < n; i++) {
|
|
if (cache[i][idName] === id) {
|
|
return cache.splice(i, 1);
|
|
}
|
|
}
|
|
}
|
|
return null;
|
|
};
|
|
|
|
HasMany.prototype.addToCache = function (inst) {
|
|
if (!inst) {
|
|
return;
|
|
}
|
|
var cache = this.modelInstance.__cachedRelations[this.definition.name];
|
|
if (cache === undefined) {
|
|
cache = this.modelInstance.__cachedRelations[this.definition.name] = [];
|
|
}
|
|
var idName = this.definition.modelTo.definition.idName();
|
|
if (Array.isArray(cache)) {
|
|
for (var i = 0, n = cache.length; i < n; i++) {
|
|
if (cache[i][idName] === inst[idName]) {
|
|
cache[i] = inst;
|
|
return;
|
|
}
|
|
}
|
|
cache.push(inst);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* HasManyThrough subclass
|
|
* @param {RelationDefinition|Object} definition
|
|
* @param {Object} modelInstance
|
|
* @returns {HasManyThrough}
|
|
* @constructor
|
|
* @class HasManyThrough
|
|
*/
|
|
function HasManyThrough(definition, modelInstance) {
|
|
if (!(this instanceof HasManyThrough)) {
|
|
return new HasManyThrough(definition, modelInstance);
|
|
}
|
|
assert(definition.type === RelationTypes.hasMany);
|
|
assert(definition.modelThrough);
|
|
HasMany.apply(this, arguments);
|
|
}
|
|
|
|
util.inherits(HasManyThrough, HasMany);
|
|
|
|
/**
|
|
* BelongsTo subclass
|
|
* @param {RelationDefinition|Object} definition
|
|
* @param {Object} modelInstance
|
|
* @returns {BelongsTo}
|
|
* @constructor
|
|
* @class BelongsTo
|
|
*/
|
|
function BelongsTo(definition, modelInstance) {
|
|
if (!(this instanceof BelongsTo)) {
|
|
return new BelongsTo(definition, modelInstance);
|
|
}
|
|
assert(definition.type === RelationTypes.belongsTo);
|
|
Relation.apply(this, arguments);
|
|
}
|
|
|
|
util.inherits(BelongsTo, Relation);
|
|
|
|
/**
|
|
* HasAndBelongsToMany subclass
|
|
* @param {RelationDefinition|Object} definition
|
|
* @param {Object} modelInstance
|
|
* @returns {HasAndBelongsToMany}
|
|
* @constructor
|
|
* @class HasAndBelongsToMany
|
|
*/
|
|
function HasAndBelongsToMany(definition, modelInstance) {
|
|
if (!(this instanceof HasAndBelongsToMany)) {
|
|
return new HasAndBelongsToMany(definition, modelInstance);
|
|
}
|
|
assert(definition.type === RelationTypes.hasAndBelongsToMany);
|
|
Relation.apply(this, arguments);
|
|
}
|
|
|
|
util.inherits(HasAndBelongsToMany, Relation);
|
|
|
|
/**
|
|
* HasOne subclass
|
|
* @param {RelationDefinition|Object} definition
|
|
* @param {Object} modelInstance
|
|
* @returns {HasOne}
|
|
* @constructor
|
|
* @class HasOne
|
|
*/
|
|
function HasOne(definition, modelInstance) {
|
|
if (!(this instanceof HasOne)) {
|
|
return new HasOne(definition, modelInstance);
|
|
}
|
|
assert(definition.type === RelationTypes.hasOne);
|
|
Relation.apply(this, arguments);
|
|
}
|
|
|
|
util.inherits(HasOne, Relation);
|
|
|
|
|
|
/*!
|
|
* Find the relation by foreign key
|
|
* @param {*} foreignKey The foreign key
|
|
* @returns {Object} The relation object
|
|
*/
|
|
function findBelongsTo(modelFrom, modelTo, keyTo) {
|
|
var relations = modelFrom.relations;
|
|
var keys = Object.keys(relations);
|
|
for (var k = 0; k < keys.length; k++) {
|
|
var rel = relations[keys[k]];
|
|
if (rel.type === RelationTypes.belongsTo &&
|
|
rel.modelTo === modelTo &&
|
|
(keyTo === undefined || rel.keyTo === keyTo)) {
|
|
return rel.keyFrom;
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/*!
|
|
* Look up a model by name from the list of given models
|
|
* @param {Object} models Models keyed by name
|
|
* @param {String} modelName The model name
|
|
* @returns {*} The matching model class
|
|
*/
|
|
function lookupModel(models, modelName) {
|
|
if(models[modelName]) {
|
|
return models[modelName];
|
|
}
|
|
var lookupClassName = modelName.toLowerCase();
|
|
for (var name in models) {
|
|
if (name.toLowerCase() === lookupClassName) {
|
|
return models[name];
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Define a "one to many" relationship by specifying the model name
|
|
*
|
|
* Examples:
|
|
* ```
|
|
* User.hasMany(Post, {as: 'posts', foreignKey: 'authorId'});
|
|
* ```
|
|
*
|
|
* ```
|
|
* Book.hasMany(Chapter);
|
|
* ```
|
|
* Or, equivalently:
|
|
* ```
|
|
* Book.hasMany('chapters', {model: Chapter});
|
|
* ```
|
|
* @param {Model} modelFrom Source model class
|
|
* @param {Object|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 Property name of foreign key field.
|
|
* @property {Object} model Model object
|
|
*/
|
|
RelationDefinition.hasMany = function hasMany(modelFrom, modelTo, params) {
|
|
var thisClassName = modelFrom.modelName;
|
|
params = params || {};
|
|
if (typeof modelTo === 'string') {
|
|
params.as = modelTo;
|
|
if (params.model) {
|
|
modelTo = params.model;
|
|
} else {
|
|
var modelToName = i8n.singularize(modelTo).toLowerCase();
|
|
modelTo = lookupModel(modelFrom.dataSource.modelBuilder.models, modelToName);
|
|
}
|
|
}
|
|
var relationName = params.as || i8n.camelize(modelTo.pluralModelName, true);
|
|
var fk = params.foreignKey || i8n.camelize(thisClassName + '_id', true);
|
|
|
|
var idName = modelFrom.dataSource.idName(modelFrom.modelName) || 'id';
|
|
|
|
var definition = new RelationDefinition({
|
|
name: relationName,
|
|
type: RelationTypes.hasMany,
|
|
modelFrom: modelFrom,
|
|
keyFrom: idName,
|
|
keyTo: fk,
|
|
modelTo: modelTo,
|
|
multiple: true,
|
|
properties: params.properties,
|
|
scope: params.scope,
|
|
options: params.options
|
|
});
|
|
|
|
if (params.through) {
|
|
definition.modelThrough = params.through;
|
|
var keyThrough = definition.throughKey || i8n.camelize(modelTo.modelName + '_id', true);
|
|
definition.keyThrough = keyThrough;
|
|
}
|
|
|
|
modelFrom.relations[relationName] = definition;
|
|
|
|
if (!params.through) {
|
|
// obviously, modelTo should have attribute called `fk`
|
|
modelTo.dataSource.defineForeignKey(modelTo.modelName, fk, modelFrom.modelName);
|
|
}
|
|
|
|
var scopeMethods = {
|
|
findById: scopeMethod(definition, 'findById'),
|
|
destroy: scopeMethod(definition, 'destroyById'),
|
|
updateById: scopeMethod(definition, 'updateById'),
|
|
exists: scopeMethod(definition, 'exists')
|
|
};
|
|
|
|
var findByIdFunc = scopeMethods.findById;
|
|
modelFrom.prototype['__findById__' + relationName] = findByIdFunc;
|
|
|
|
var destroyByIdFunc = scopeMethods.destroy;
|
|
modelFrom.prototype['__destroyById__' + relationName] = destroyByIdFunc;
|
|
|
|
var updateByIdFunc = scopeMethods.updateById;
|
|
modelFrom.prototype['__updateById__' + relationName] = updateByIdFunc;
|
|
|
|
if(definition.modelThrough) {
|
|
scopeMethods.create = scopeMethod(definition, 'create');
|
|
scopeMethods.add = scopeMethod(definition, 'add');
|
|
scopeMethods.remove = scopeMethod(definition, 'remove');
|
|
|
|
var addFunc = scopeMethods.add;
|
|
modelFrom.prototype['__link__' + relationName] = addFunc;
|
|
|
|
var removeFunc = scopeMethods.remove;
|
|
modelFrom.prototype['__unlink__' + relationName] = removeFunc;
|
|
} else {
|
|
scopeMethods.create = scopeMethod(definition, 'create');
|
|
scopeMethods.build = scopeMethod(definition, 'build');
|
|
}
|
|
|
|
// Mix the property and scoped methods into the prototype class
|
|
defineScope(modelFrom.prototype, params.through || modelTo, relationName, function () {
|
|
var filter = {};
|
|
filter.where = {};
|
|
filter.where[fk] = this[idName];
|
|
|
|
definition.applyScope(this, filter);
|
|
|
|
if (params.through) {
|
|
filter.collect = i8n.camelize(modelTo.modelName, true);
|
|
filter.include = filter.collect;
|
|
}
|
|
return filter;
|
|
}, scopeMethods);
|
|
|
|
};
|
|
|
|
function scopeMethod(definition, methodName) {
|
|
var relationClass = RelationClasses[definition.type];
|
|
if (definition.type === RelationTypes.hasMany && definition.modelThrough) {
|
|
relationClass = RelationClasses.hasManyThrough;
|
|
}
|
|
var method = function () {
|
|
var relation = new relationClass(definition, this);
|
|
return relation[methodName].apply(relation, arguments);
|
|
};
|
|
|
|
var relationMethod = relationClass.prototype[methodName];
|
|
if (relationMethod.shared) {
|
|
method.shared = true;
|
|
method.accepts = relationMethod.accepts;
|
|
method.returns = relationMethod.returns;
|
|
method.http = relationMethod.http;
|
|
method.description = relationMethod.description;
|
|
}
|
|
return method;
|
|
}
|
|
|
|
/**
|
|
* Find a related item by foreign key
|
|
* @param {*} fkId The foreign key
|
|
* @param {Function} cb The callback function
|
|
*/
|
|
HasMany.prototype.findById = function (fkId, cb) {
|
|
var modelTo = this.definition.modelTo;
|
|
var fk = this.definition.keyTo;
|
|
var pk = this.definition.keyFrom;
|
|
var modelInstance = this.modelInstance;
|
|
|
|
var idName = this.definition.modelTo.definition.idName();
|
|
var filter = {};
|
|
filter.where = {};
|
|
filter.where[idName] = fkId;
|
|
filter.where[fk] = modelInstance[pk];
|
|
|
|
this.definition.applyScope(modelInstance, filter);
|
|
|
|
modelTo.findOne(filter, function (err, inst) {
|
|
if (err) {
|
|
return cb(err);
|
|
}
|
|
if (!inst) {
|
|
err = new Error('No instance with id ' + fkId + ' found for ' + modelTo.modelName);
|
|
err.statusCode = 404;
|
|
return cb(err);
|
|
}
|
|
// Check if the foreign key matches the primary key
|
|
if (inst[fk] && inst[fk].toString() === modelInstance[pk].toString()) {
|
|
cb(null, inst);
|
|
} else {
|
|
err = new Error('Key mismatch: ' + this.definition.modelFrom.modelName + '.' + pk
|
|
+ ': ' + modelInstance[pk]
|
|
+ ', ' + modelTo.modelName + '.' + fk + ': ' + inst[fk]);
|
|
err.statusCode = 400;
|
|
cb(err);
|
|
}
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Find a related item by foreign key
|
|
* @param {*} fkId The foreign key
|
|
* @param {Function} cb The callback function
|
|
*/
|
|
HasMany.prototype.exists = function (fkId, cb) {
|
|
var modelTo = this.definition.modelTo;
|
|
var fk = this.definition.keyTo;
|
|
var pk = this.definition.keyFrom;
|
|
var modelInstance = this.modelInstance;
|
|
|
|
modelTo.findById(fkId, function (err, inst) {
|
|
if (err) {
|
|
return cb(err);
|
|
}
|
|
if (!inst) {
|
|
return cb(null, false);
|
|
}
|
|
// Check if the foreign key matches the primary key
|
|
if (inst[fk] && inst[fk].toString() === modelInstance[pk].toString()) {
|
|
cb(null, true);
|
|
} else {
|
|
cb(null, false);
|
|
}
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Update a related item by foreign key
|
|
* @param {*} fkId The foreign key
|
|
* @param {Function} cb The callback function
|
|
*/
|
|
HasMany.prototype.updateById = function (fkId, data, cb) {
|
|
this.findById(fkId, function (err, inst) {
|
|
if (err) {
|
|
return cb && cb(err);
|
|
}
|
|
inst.updateAttributes(data, cb);
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Delete a related item by foreign key
|
|
* @param {*} fkId The foreign key
|
|
* @param {Function} cb The callback function
|
|
*/
|
|
HasMany.prototype.destroyById = function (fkId, cb) {
|
|
var self = this;
|
|
this.findById(fkId, function(err, inst) {
|
|
if (err) {
|
|
return cb(err);
|
|
}
|
|
self.removeFromCache(inst[fkId]);
|
|
inst.destroy(cb);
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Find a related item by foreign key
|
|
* @param {*} fkId The foreign key value
|
|
* @param {Function} cb The callback function
|
|
*/
|
|
HasManyThrough.prototype.findById = function (fkId, cb) {
|
|
var self = this;
|
|
var modelTo = this.definition.modelTo;
|
|
var pk = this.definition.keyFrom;
|
|
var modelInstance = this.modelInstance;
|
|
var modelThrough = this.definition.modelThrough;
|
|
|
|
self.exists(fkId, function (err, exists) {
|
|
if (err || !exists) {
|
|
if (!err) {
|
|
err = new Error('No relation found in ' + modelThrough.modelName
|
|
+ ' for (' + self.definition.modelFrom.modelName + '.' + modelInstance[pk]
|
|
+ ',' + modelTo.modelName + '.' + fkId + ')');
|
|
err.statusCode = 404;
|
|
}
|
|
return cb(err);
|
|
}
|
|
modelTo.findById(fkId, function (err, inst) {
|
|
if (err) {
|
|
return cb(err);
|
|
}
|
|
if (!inst) {
|
|
err = new Error('No instance with id ' + fkId + ' found for ' + modelTo.modelName);
|
|
err.statusCode = 404;
|
|
return cb(err);
|
|
}
|
|
cb(err, inst);
|
|
});
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Delete a related item by foreign key
|
|
* @param {*} fkId The foreign key
|
|
* @param {Function} cb The callback function
|
|
*/
|
|
HasManyThrough.prototype.destroyById = function (fkId, cb) {
|
|
var self = this;
|
|
var modelTo = this.definition.modelTo;
|
|
var pk = this.definition.keyFrom;
|
|
var modelInstance = this.modelInstance;
|
|
var modelThrough = this.definition.modelThrough;
|
|
|
|
self.exists(fkId, function (err, exists) {
|
|
if (err || !exists) {
|
|
if (!err) {
|
|
err = new Error('No record found in ' + modelThrough.modelName
|
|
+ ' for (' + self.definition.modelFrom.modelName + '.' + modelInstance[pk]
|
|
+ ' ,' + modelTo.modelName + '.' + fkId + ')');
|
|
err.statusCode = 404;
|
|
}
|
|
return cb(err);
|
|
}
|
|
self.remove(fkId, function(err) {
|
|
if(err) {
|
|
return cb(err);
|
|
}
|
|
modelTo.deleteById(fkId, cb);
|
|
});
|
|
});
|
|
};
|
|
|
|
// Create an instance of the target model and connect it to the instance of
|
|
// the source model by creating an instance of the through model
|
|
HasManyThrough.prototype.create = function create(data, done) {
|
|
var self = this;
|
|
var definition = this.definition;
|
|
var modelTo = definition.modelTo;
|
|
var modelThrough = definition.modelThrough;
|
|
|
|
if (typeof data === 'function' && !done) {
|
|
done = data;
|
|
data = {};
|
|
}
|
|
|
|
var modelInstance = this.modelInstance;
|
|
|
|
// First create the target model
|
|
modelTo.create(data, function (err, to) {
|
|
if (err) {
|
|
return done && done(err, to);
|
|
}
|
|
// The primary key for the target model
|
|
var pk2 = definition.modelTo.definition.idName();
|
|
var fk1 = findBelongsTo(modelThrough, definition.modelFrom,
|
|
definition.keyFrom);
|
|
var fk2 = findBelongsTo(modelThrough, definition.modelTo, pk2);
|
|
var d = {};
|
|
d[fk1] = modelInstance[definition.keyFrom];
|
|
d[fk2] = to[pk2];
|
|
|
|
definition.applyProperties(modelInstance, d);
|
|
|
|
// Then create the through model
|
|
modelThrough.create(d, function (e, through) {
|
|
if (e) {
|
|
// Undo creation of the target model
|
|
to.destroy(function () {
|
|
done && done(e);
|
|
});
|
|
} else {
|
|
self.addToCache(to);
|
|
done && done(err, to);
|
|
}
|
|
});
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Add the target model instance to the 'hasMany' relation
|
|
* @param {Object|ID} acInst The actual instance or id value
|
|
*/
|
|
HasManyThrough.prototype.add = function (acInst, done) {
|
|
var self = this;
|
|
var definition = this.definition;
|
|
var modelThrough = definition.modelThrough;
|
|
var pk1 = definition.keyFrom;
|
|
|
|
var data = {};
|
|
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 instanceof definition.modelTo) ? acInst[pk2] : acInst;
|
|
|
|
var filter = { where: query };
|
|
|
|
definition.applyScope(this.modelInstance, filter);
|
|
|
|
data[fk1] = this.modelInstance[pk1];
|
|
data[fk2] = (acInst instanceof definition.modelTo) ? acInst[pk2] : acInst;
|
|
definition.applyProperties(this.modelInstance, data);
|
|
|
|
// Create an instance of the through model
|
|
modelThrough.findOrCreate(filter, data, function(err, ac) {
|
|
if(!err) {
|
|
if (acInst instanceof definition.modelTo) {
|
|
self.addToCache(acInst);
|
|
}
|
|
}
|
|
done(err, ac);
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Check if the target model instance is related to the 'hasMany' relation
|
|
* @param {Object|ID} acInst The actual instance or id value
|
|
*/
|
|
HasManyThrough.prototype.exists = function (acInst, done) {
|
|
var definition = this.definition;
|
|
var modelThrough = definition.modelThrough;
|
|
var pk1 = definition.keyFrom;
|
|
|
|
var data = {};
|
|
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 instanceof definition.modelTo) ? acInst[pk2] : acInst;
|
|
|
|
data[fk1] = this.modelInstance[pk1];
|
|
data[fk2] = (acInst instanceof definition.modelTo) ? acInst[pk2] : acInst;
|
|
|
|
modelThrough.count(query, function(err, ac) {
|
|
done(err, ac > 0);
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Remove the target model instance from the 'hasMany' relation
|
|
* @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 instanceof definition.modelTo) ? 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,
|
|
properties: params.properties,
|
|
scope: params.scope,
|
|
options: params.options
|
|
});
|
|
|
|
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;
|
|
}
|
|
});
|
|
|
|
// FIXME: [rfeng] 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);
|
|
};
|
|
modelFrom.prototype['__get__' + relationName] = fn;
|
|
};
|
|
|
|
BelongsTo.prototype.create = function(targetModelData, cb) {
|
|
var self = this;
|
|
var modelTo = this.definition.modelTo;
|
|
var fk = this.definition.keyFrom;
|
|
var pk = this.definition.keyTo;
|
|
var modelInstance = this.modelInstance;
|
|
|
|
if (typeof targetModelData === 'function' && !cb) {
|
|
cb = targetModelData;
|
|
targetModelData = {};
|
|
}
|
|
|
|
this.definition.applyProperties(modelInstance, 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;
|
|
this.definition.applyProperties(this.modelInstance, targetModelData || {});
|
|
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) {
|
|
var query = {where: {}};
|
|
query.where[pk] = modelInstance[fk];
|
|
|
|
this.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[pk] && modelInstance[fk]
|
|
&& inst[pk].toString() === modelInstance[fk].toString()) {
|
|
self.resetCache(inst);
|
|
cb(null, inst);
|
|
} else {
|
|
err = new Error('Key mismatch: ' + self.definition.modelFrom.modelName + '.' + fk
|
|
+ ': ' + modelInstance[fk]
|
|
+ ', ' + modelTo.modelName + '.' + pk + ': ' + inst[pk]);
|
|
err.statusCode = 400;
|
|
cb(err);
|
|
}
|
|
});
|
|
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,
|
|
options: params.options
|
|
});
|
|
|
|
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);
|
|
relationMethod._targetClass = relationDef.modelTo.modelName;
|
|
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]
|
|
&& inst[fk].toString() === modelInstance[pk].toString()) {
|
|
self.resetCache(inst);
|
|
cb(null, inst);
|
|
} else {
|
|
err = new Error('Key mismatch: ' + self.definition.modelFrom.modelName + '.' + pk
|
|
+ ': ' + modelInstance[pk]
|
|
+ ', ' + modelTo.modelName + '.' + fk + ': ' + inst[fk]);
|
|
err.statusCode = 400;
|
|
cb(err);
|
|
}
|
|
});
|
|
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();
|
|
}
|
|
};
|