288 lines
7.8 KiB
JavaScript
288 lines
7.8 KiB
JavaScript
var i8n = require('inflection');
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var utils = require('./utils');
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var defineCachedRelations = utils.defineCachedRelations;
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/**
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* Module exports
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*/
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exports.defineScope = defineScope;
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exports.mergeQuery = mergeQuery;
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function ScopeDefinition(definition) {
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this.sourceModel = definition.sourceModel;
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this.targetModel = definition.targetModel || definition.sourceModel;
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this.name = definition.name;
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this.params = definition.params;
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this.methods = definition.methods;
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}
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ScopeDefinition.prototype.related = function(receiver, scopeParams, condOrRefresh, cb) {
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var name = this.name;
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var self = receiver;
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var actualCond = {};
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var actualRefresh = false;
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var saveOnCache = true;
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if (arguments.length === 3) {
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cb = condOrRefresh;
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} else if (arguments.length === 4) {
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if (typeof condOrRefresh === 'boolean') {
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actualRefresh = condOrRefresh;
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} else {
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actualCond = condOrRefresh;
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actualRefresh = true;
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saveOnCache = false;
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}
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} else {
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throw new Error('Method can be only called with one or two arguments');
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}
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if (!self.__cachedRelations || self.__cachedRelations[name] === undefined
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|| actualRefresh) {
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// It either doesn't hit the cache or refresh is required
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var params = mergeQuery(actualCond, scopeParams);
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return this.targetModel.find(params, function (err, data) {
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if (!err && saveOnCache) {
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defineCachedRelations(self);
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self.__cachedRelations[name] = data;
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}
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cb(err, data);
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});
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} else {
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// Return from cache
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cb(null, self.__cachedRelations[name]);
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}
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}
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/**
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* Define a scope to the class
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* @param {Model} cls The class where the scope method is added
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* @param {Model} targetClass The class that a query to run against
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* @param {String} name The name of the scope
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* @param {Object|Function} params The parameters object for the query or a function
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* to return the query object
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* @param methods An object of methods keyed by the method name to be bound to the class
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*/
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function defineScope(cls, targetClass, name, params, methods) {
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// collect meta info about scope
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if (!cls._scopeMeta) {
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cls._scopeMeta = {};
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}
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// only makes sense to add scope in meta if base and target classes
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// are same
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if (cls === targetClass) {
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cls._scopeMeta[name] = params;
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} else {
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if (!targetClass._scopeMeta) {
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targetClass._scopeMeta = {};
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}
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}
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var definition = new ScopeDefinition({
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sourceModel: cls,
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targetModel: targetClass,
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name: name,
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params: params,
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methods: methods
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});
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// Define a property for the scope
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Object.defineProperty(cls, name, {
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enumerable: false,
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configurable: true,
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/**
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* This defines a property for the scope. For example, user.accounts or
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* User.vips. Please note the cls can be the model class or prototype of
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* the model class.
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*
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* The property value is function. It can be used to query the scope,
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* such as user.accounts(condOrRefresh, cb) or User.vips(cb). The value
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* can also have child properties for create/build/delete. For example,
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* user.accounts.create(act, cb).
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*
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*/
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get: function () {
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var self = this;
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var f = function(condOrRefresh, cb) {
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if(arguments.length === 1) {
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definition.related(self, f._scope, condOrRefresh);
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} else {
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definition.related(self, f._scope, condOrRefresh, cb);
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}
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};
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f._scope = typeof definition.params === 'function' ?
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definition.params.call(self) : definition.params;
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f._targetClass = definition.targetModel.modelName;
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if (f._scope.collect) {
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f._targetClass = i8n.capitalize(f._scope.collect);
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}
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f.build = build;
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f.create = create;
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f.destroyAll = destroyAll;
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for (var i in definition.methods) {
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f[i] = definition.methods[i].bind(self);
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}
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// Define scope-chaining, such as
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// Station.scope('active', {where: {isActive: true}});
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// Station.scope('subway', {where: {isUndeground: true}});
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// Station.active.subway(cb);
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Object.keys(targetClass._scopeMeta).forEach(function (name) {
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Object.defineProperty(f, name, {
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enumerable: false,
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get: function () {
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mergeQuery(f._scope, targetClass._scopeMeta[name]);
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return f;
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}
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});
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}.bind(self));
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return f;
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}
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});
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// Wrap the property into a function for remoting
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var fn = function () {
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// primaryObject.scopeName, such as user.accounts
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var f = this[name];
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// set receiver to be the scope property whose value is a function
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f.apply(this[name], arguments);
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};
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cls['__get__' + name] = fn;
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var fn_create = function () {
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var f = this[name].create;
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f.apply(this[name], arguments);
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};
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cls['__create__' + name] = fn_create;
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var fn_delete = function () {
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var f = this[name].destroyAll;
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f.apply(this[name], arguments);
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};
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cls['__delete__' + name] = fn_delete;
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/*
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* Extracting fixed property values for the scope from the where clause into
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* the data object
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*
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* @param {Object} The data object
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* @param {Object} The where clause
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*/
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function setScopeValuesFromWhere(data, where) {
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for (var i in where) {
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if (i === 'and') {
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// Find fixed property values from each subclauses
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for (var w = 0, n = where[i].length; w < n; w++) {
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setScopeValuesFromWhere(data, where[i][w]);
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}
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continue;
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}
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var prop = targetClass.definition.properties[i];
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if (prop) {
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var val = where[i];
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if (typeof val !== 'object' || val instanceof prop.type
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|| prop.type.name === 'ObjectID') // MongoDB key
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{
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// Only pick the {propertyName: propertyValue}
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data[i] = where[i];
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}
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}
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}
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}
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// and it should have create/build methods with binded thisModelNameId param
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function build(data) {
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data = data || {};
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// Find all fixed property values for the scope
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var where = (this._scope && this._scope.where) || {};
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setScopeValuesFromWhere(data, where);
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return new targetClass(data);
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}
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function create(data, cb) {
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if (typeof data === 'function') {
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cb = data;
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data = {};
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}
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this.build(data).save(cb);
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}
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/*
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Callback
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- The callback will be called after all elements are destroyed
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- For every destroy call which results in an error
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- If fetching the Elements on which destroyAll is called results in an error
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*/
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function destroyAll(cb) {
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var where = (this._scope && this._scope.where) || {};
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targetClass.destroyAll(where, cb);
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}
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return definition;
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}
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/*!
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* Merge query parameters
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* @param {Object} base The base object to contain the merged results
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* @param {Object} update The object containing updates to be merged
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* @returns {*|Object} The base object
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* @private
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*/
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function mergeQuery(base, update) {
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if (!update) {
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return;
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}
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base = base || {};
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if (update.where && Object.keys(update.where).length > 0) {
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if (base.where && Object.keys(base.where).length > 0) {
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base.where = {and: [base.where, update.where]};
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} else {
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base.where = update.where;
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}
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}
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// Merge inclusion
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if (update.include) {
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if (!base.include) {
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base.include = update.include;
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} else {
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var saved = base.include;
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base.include = {};
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base.include[update.include] = [saved];
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}
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}
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if (update.collect) {
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base.collect = update.collect;
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}
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// overwrite order
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if (update.order) {
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base.order = update.order;
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}
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// overwrite pagination
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if (update.limit !== undefined) {
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base.limit = update.limit;
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}
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if (update.skip !== undefined) {
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base.skip = update.skip;
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}
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if (update.offset !== undefined) {
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base.offset = update.offset;
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}
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// Overwrite fields
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if (update.fields !== undefined) {
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base.fields = update.fields;
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}
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return base;
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}
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