918 lines
25 KiB
JavaScript
918 lines
25 KiB
JavaScript
/**
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* Module dependencies
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*/
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var util = require('util');
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var jutil = require('./jutil');
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var Validatable = require('./validatable').Validatable;
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var Hookable = require('./hookable').Hookable;
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var DEFAULT_CACHE_LIMIT = 1000;
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exports.AbstractClass = AbstractClass;
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jutil.inherits(AbstractClass, Validatable);
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jutil.inherits(AbstractClass, Hookable);
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/**
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* Abstract class - base class for all persist objects
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* provides **common API** to access any database adapter.
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* This class describes only abstract behavior layer, refer to `lib/adapters/*.js`
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* to learn more about specific adapter implementations
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*
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* `AbstractClass` mixes `Validatable` and `Hookable` classes methods
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*
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* @constructor
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* @param {Object} data - initial object data
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*/
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function AbstractClass(data) {
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var self = this;
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var ds = this.constructor.schema.definitions[this.constructor.modelName];
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var properties = ds.properties;
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var settings = ds.setings;
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data = data || {};
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if (data.id) {
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defineReadonlyProp(this, 'id', data.id);
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}
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Object.defineProperty(this, 'cachedRelations', {
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writable: true,
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enumerable: false,
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configurable: true,
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value: {}
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});
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Object.keys(properties).forEach(function (attr) {
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var _attr = '_' + attr,
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attr_was = attr + '_was';
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// Hidden property to store currrent value
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Object.defineProperty(this, _attr, {
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writable: true,
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enumerable: false,
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configurable: true,
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value: isdef(data[attr]) ? data[attr] :
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(isdef(this[attr]) ? this[attr] : (
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getDefault(attr)
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))
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});
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// Public setters and getters
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Object.defineProperty(this, attr, {
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get: function () {
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if (this.constructor.getter[attr]) {
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return this.constructor.getter[attr].call(this);
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} else {
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return this[_attr];
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}
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},
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set: function (value) {
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if (this.constructor.setter[attr]) {
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this.constructor.setter[attr].call(this, value);
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} else {
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this[_attr] = value;
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}
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},
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configurable: true,
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enumerable: true
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});
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if (data.hasOwnProperty(attr)) {
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// Getter for initial property
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Object.defineProperty(this, attr_was, {
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writable: true,
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value: data[attr],
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configurable: true,
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enumerable: false
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});
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}
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}.bind(this));
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function getDefault(attr) {
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var def = properties[attr]['default']
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if (isdef(def)) {
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if (typeof def === 'function') {
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return def();
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} else {
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return def;
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}
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} else {
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return null;
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}
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}
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this.trigger("initialize");
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};
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AbstractClass.setter = {};
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AbstractClass.getter = {};
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/**
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* @param {String} prop - property name
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* @param {Object} params - various property configuration
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*/
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AbstractClass.defineProperty = function (prop, params) {
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this.schema.defineProperty(this.modelName, prop, params);
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};
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AbstractClass.whatTypeName = function (propName) {
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var ds = this.schema.definitions[this.modelName];
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return ds.properties[propName].type.name;
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};
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AbstractClass.prototype.whatTypeName = function (propName) {
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return this.constructor.whatTypeName(propName);
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};
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/**
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* Create new instance of Model class, saved in database
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*
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* @param data [optional]
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* @param callback(err, obj)
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* callback called with arguments:
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*
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* - err (null or Error)
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* - instance (null or Model)
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*/
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AbstractClass.create = function (data, callback) {
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if (stillConnecting(this.schema, this, arguments)) return;
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var modelName = this.modelName;
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if (typeof data === 'function') {
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callback = data;
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data = {};
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}
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if (typeof callback !== 'function') {
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callback = function () {};
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}
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var obj = null;
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// if we come from save
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if (data instanceof AbstractClass && !data.id) {
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obj = data;
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data = obj.toObject(true);
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// recall constructor to update _was property states (maybe bad idea)
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this.call(obj, data);
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create();
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} else {
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obj = new this(data);
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data = obj.toObject(true);
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// validation required
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obj.isValid(function (valid) {
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if (!valid) {
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callback(new Error('Validation error'), obj);
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} else {
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create();
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}
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});
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}
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function create() {
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obj.trigger('create', function (done) {
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this._adapter().create(modelName, data, function (err, id) {
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if (id) {
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defineReadonlyProp(obj, 'id', id);
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addToCache(this.constructor, obj);
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}
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done.call(this, function () {
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if (callback) {
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callback(err, obj);
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}
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});
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}.bind(this));
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});
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}
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};
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function stillConnecting(schema, obj, args) {
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if (schema.connected) return false;
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var method = args.callee;
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schema.on('connected', function () {
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method.apply(obj, [].slice.call(args));
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});
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return true;
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};
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/**
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* Update or insert
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*/
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AbstractClass.upsert = AbstractClass.updateOrCreate = function upsert(data, callback) {
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if (stillConnecting(this.schema, this, arguments)) return;
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var Model = this;
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if (!data.id) return this.create(data, callback);
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if (this.schema.adapter.updateOrCreate) {
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this.schema.adapter.updateOrCreate(Model.modelName, data, function (err, data) {
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var obj = data ? new Model(data) : null;
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if (obj) {
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addToCache(Model, obj);
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}
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callback(err, obj);
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});
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} else {
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this.find(data.id, function (err, inst) {
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if (err) return callback(err);
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if (inst) {
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inst.updateAttributes(data, callback);
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} else {
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var obj = new Model(data);
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obj.save(data, callback);
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}
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});
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}
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};
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/**
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* Check whether object exitst in database
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*
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* @param {id} id - identifier of object (primary key value)
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* @param {Function} cb - callbacl called with (err, exists: Bool)
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*/
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AbstractClass.exists = function exists(id, cb) {
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if (stillConnecting(this.schema, this, arguments)) return;
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if (id) {
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this.schema.adapter.exists(this.modelName, id, cb);
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} else {
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cb(new Error('Model::exists requires positive id argument'));
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}
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};
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/**
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* Find object by id
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*
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* @param {id} id - primary key value
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* @param {Function} cb - callback called with (err, instance)
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*/
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AbstractClass.find = function find(id, cb) {
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if (stillConnecting(this.schema, this, arguments)) return;
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this.schema.adapter.find(this.modelName, id, function (err, data) {
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var obj = null;
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if (data) {
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var cached = getCached(this, data.id);
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if (cached) {
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obj = cached;
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substractDirtyAttributes(obj, data);
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this.call(obj, data);
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} else {
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data.id = id;
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obj = new this(data);
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addToCache(this, id);
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}
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}
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cb(err, obj);
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}.bind(this));
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};
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/**
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* Find all instances of Model, matched by query
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* make sure you have marked as `index: true` fields for filter or sort
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*
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* @param {Object} params (optional)
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*
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* - where: Object `{ key: val, key2: {gt: 'val2'}}`
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* - order: String
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* - limit: Number
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* - skip: Number
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*
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* @param {Function} callback (required) called with arguments:
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*
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* - err (null or Error)
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* - Array of instances
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*/
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AbstractClass.all = function all(params, cb) {
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if (stillConnecting(this.schema, this, arguments)) return;
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if (arguments.length === 1) {
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cb = params;
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params = null;
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}
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var constr = this;
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this.schema.adapter.all(this.modelName, params, function (err, data) {
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var collection = null;
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if (data && data.map) {
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collection = data.map(function (d) {
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var obj = null;
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// do not create different instances for the same object
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var cached = getCached(constr, d.id);
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if (cached) {
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obj = cached;
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// keep dirty attributes untouthed (remove from dataset)
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substractDirtyAttributes(obj, d);
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constr.call(obj, d);
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} else {
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obj = new constr(d);
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if (obj.id) addToCache(constr, obj);
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}
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return obj;
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});
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cb(err, collection);
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}
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});
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};
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/**
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* Find one record, same as `all`, limited by 1 and return object, not collection
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*
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* @param {Object} params - search conditions
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* @param {Function} cb - callback called with (err, instance)
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*/
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AbstractClass.findOne = function findOne(params, cb) {
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if (stillConnecting(this.schema, this, arguments)) return;
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if (typeof params === 'function') {
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cb = params;
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params = {};
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}
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params.limit = 1;
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this.all(params, function (err, collection) {
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if (err || !collection || !collection.length > 0) return cb(err);
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cb(err, collection[0]);
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});
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};
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function substractDirtyAttributes(object, data) {
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Object.keys(object.toObject()).forEach(function (attr) {
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if (data.hasOwnProperty(attr) && object.propertyChanged(attr)) {
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delete data[attr];
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}
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});
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}
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/**
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* Destroy all records
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* @param {Function} cb - callback called with (err)
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*/
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AbstractClass.destroyAll = function destroyAll(cb) {
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if (stillConnecting(this.schema, this, arguments)) return;
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this.schema.adapter.destroyAll(this.modelName, function (err) {
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clearCache(this);
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cb(err);
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}.bind(this));
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};
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/**
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* Return count of matched records
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*
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* @param {Object} where - search conditions (optional)
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* @param {Function} cb - callback, called with (err, count)
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*/
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AbstractClass.count = function (where, cb) {
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if (stillConnecting(this.schema, this, arguments)) return;
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if (typeof where === 'function') {
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cb = where;
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where = null;
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}
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this.schema.adapter.count(this.modelName, cb, where);
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};
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/**
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* Return string representation of class
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*
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* @override default toString method
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*/
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AbstractClass.toString = function () {
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return '[Model ' + this.modelName + ']';
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}
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/**
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* Save instance. When instance haven't id, create method called instead.
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* Triggers: validate, save, update | create
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* @param options {validate: true, throws: false} [optional]
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* @param callback(err, obj)
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*/
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AbstractClass.prototype.save = function (options, callback) {
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if (stillConnecting(this.constructor.schema, this, arguments)) return;
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if (typeof options == 'function') {
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callback = options;
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options = {};
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}
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callback = callback || function () {};
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options = options || {};
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if (!('validate' in options)) {
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options.validate = true;
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}
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if (!('throws' in options)) {
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options.throws = false;
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}
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if (options.validate) {
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this.isValid(function (valid) {
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if (valid) {
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save.call(this);
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} else {
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var err = new Error('Validation error');
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// throws option is dangerous for async usage
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if (options.throws) {
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throw err;
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}
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callback(err, this);
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}
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}.bind(this));
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} else {
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save.call(this);
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}
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function save() {
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this.trigger('save', function (saveDone) {
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var modelName = this.constructor.modelName;
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var data = this.toObject(true);
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var inst = this;
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if (inst.id) {
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inst.trigger('update', function (updateDone) {
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inst._adapter().save(modelName, data, function (err) {
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if (err) {
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console.log(err);
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} else {
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inst.constructor.call(inst, data);
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}
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updateDone.call(inst, function () {
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saveDone.call(inst, function () {
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callback(err, inst);
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});
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});
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});
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}, data);
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} else {
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inst.constructor.create(inst, function (err) {
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saveDone.call(inst, function () {
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callback(err, inst);
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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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AbstractClass.prototype.isNewRecord = function () {
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return !this.id;
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};
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/**
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* Return adapter of current record
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* @private
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*/
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AbstractClass.prototype._adapter = function () {
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return this.constructor.schema.adapter;
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};
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/**
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* Convert instance to Object
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*
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* @param {Boolean} onlySchema - restrict properties to schema only, default false
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* when onlySchema == true, only properties defined in schema returned,
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* otherwise all enumerable properties returned
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* @returns {Object} - canonical object representation (no getters and setters)
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*/
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AbstractClass.prototype.toObject = function (onlySchema) {
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var data = {};
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var ds = this.constructor.schema.definitions[this.constructor.modelName];
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var properties = ds.properties;
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// weird
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Object.keys(onlySchema ? properties : this).concat(['id']).forEach(function (property) {
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data[property] = this[property];
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}.bind(this));
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return data;
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};
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/**
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* Delete object from persistence
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*
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* @triggers `destroy` hook (async) before and after destroying object
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*/
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AbstractClass.prototype.destroy = function (cb) {
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if (stillConnecting(this.constructor.schema, this, arguments)) return;
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this.trigger('destroy', function (destroyed) {
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this._adapter().destroy(this.constructor.modelName, this.id, function (err) {
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removeFromCache(this.constructor, this.id);
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destroyed(function () {
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cb && cb(err);
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});
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}.bind(this));
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});
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};
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|
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/**
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* Update single attribute
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*
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* equals to `updateAttributes({name: value}, cb)
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*
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* @param {String} name - name of property
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* @param {Mixed} value - value of property
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* @param {Function} callback - callback called with (err, instance)
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*/
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AbstractClass.prototype.updateAttribute = function updateAttribute(name, value, callback) {
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data = {};
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data[name] = value;
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this.updateAttributes(data, callback);
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};
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/**
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* Update set of attributes
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*
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* this method performs validation before updating
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*
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* @trigger `validation`, `save` and `update` hooks
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* @param {Object} data - data to update
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* @param {Function} callback - callback called with (err, instance)
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*/
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AbstractClass.prototype.updateAttributes = function updateAttributes(data, cb) {
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if (stillConnecting(this.constructor.schema, this, arguments)) return;
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var inst = this;
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var model = this.constructor.modelName;
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// update instance's properties
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Object.keys(data).forEach(function (key) {
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inst[key] = data[key];
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});
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inst.isValid(function (valid) {
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if (!valid) {
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if (cb) {
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cb(new Error('Validation error'));
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}
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} else {
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update();
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}
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});
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function update() {
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inst.trigger('save', function (saveDone) {
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inst.trigger('update', function (done) {
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Object.keys(data).forEach(function (key) {
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data[key] = inst[key];
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});
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inst._adapter().updateAttributes(model, inst.id, data, function (err) {
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if (!err) {
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inst.constructor.call(inst, data);
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/*
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Object.keys(data).forEach(function (key) {
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inst[key] = data[key];
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Object.defineProperty(inst, key + '_was', {
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writable: false,
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configurable: true,
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enumerable: false,
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value: data[key]
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});
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});
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*/
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}
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done.call(inst, function () {
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saveDone.call(inst, function () {
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cb(err, inst);
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});
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});
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});
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}, data);
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});
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}
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};
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|
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AbstractClass.prototype.fromObject = function (obj) {
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Object.keys(obj).forEach(function (key) {
|
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this[key] = obj[key];
|
|
}.bind(this));
|
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};
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|
|
|
/**
|
|
* Checks is property changed based on current property and initial value
|
|
*
|
|
* @param {String} attr - property name
|
|
* @return Boolean
|
|
*/
|
|
AbstractClass.prototype.propertyChanged = function propertyChanged(attr) {
|
|
return this['_' + attr] !== this[attr + '_was'];
|
|
};
|
|
|
|
/**
|
|
* Reload object from persistence
|
|
*
|
|
* @requires `id` member of `object` to be able to call `find`
|
|
* @param {Function} callback - called with (err, instance) arguments
|
|
*/
|
|
AbstractClass.prototype.reload = function reload(callback) {
|
|
if (stillConnecting(this.constructor.schema, this, arguments)) return;
|
|
|
|
var obj = getCached(this.constructor, this.id);
|
|
if (obj) obj.reset();
|
|
this.constructor.find(this.id, callback);
|
|
};
|
|
|
|
/**
|
|
* Reset dirty attributes
|
|
*
|
|
* this method does not perform any database operation it just reset object to it's
|
|
* initial state
|
|
*/
|
|
AbstractClass.prototype.reset = function () {
|
|
var obj = this;
|
|
Object.keys(obj).forEach(function (k) {
|
|
if (k !== 'id' && !obj.constructor.schema.definitions[obj.constructor.modelName].properties[k]) {
|
|
delete obj[k];
|
|
}
|
|
if (obj.propertyChanged(k)) {
|
|
obj[k] = obj[k + '_was'];
|
|
}
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Declare hasMany relation
|
|
*
|
|
* @param {Class} anotherClass - class to has many
|
|
* @param {Object} params - configuration {as:, foreignKey:}
|
|
* @example `User.hasMany(Post, {as: 'posts', foreignKey: 'authorId'});`
|
|
*/
|
|
AbstractClass.hasMany = function hasMany(anotherClass, params) {
|
|
var methodName = params.as; // or pluralize(anotherClass.modelName)
|
|
var fk = params.foreignKey;
|
|
// each instance of this class should have method named
|
|
// pluralize(anotherClass.modelName)
|
|
// which is actually just anotherClass.all({where: {thisModelNameId: this.id}}, cb);
|
|
defineScope(this.prototype, anotherClass, methodName, function () {
|
|
var x = {};
|
|
x[fk] = this.id;
|
|
return {where: x};
|
|
}, {
|
|
find: find,
|
|
destroy: destroy
|
|
});
|
|
|
|
// obviously, anotherClass should have attribute called `fk`
|
|
anotherClass.schema.defineForeignKey(anotherClass.modelName, fk);
|
|
|
|
function find(id, cb) {
|
|
anotherClass.find(id, function (err, inst) {
|
|
if (err) return cb(err);
|
|
if (inst[fk] == this.id) {
|
|
cb(null, inst);
|
|
} else {
|
|
cb(new Error('Permission denied'));
|
|
}
|
|
}.bind(this));
|
|
}
|
|
|
|
function destroy(id, cb) {
|
|
this.find(id, function (err, inst) {
|
|
if (err) return cb(err);
|
|
if (inst) {
|
|
inst.destroy(cb);
|
|
} else {
|
|
cb(new Error('Not found'));
|
|
}
|
|
});
|
|
}
|
|
|
|
};
|
|
|
|
/**
|
|
* Declare belongsTo relation
|
|
*
|
|
* @param {Class} anotherClass - class to belong
|
|
* @param {Object} params - configuration {as: 'propertyName', foreignKey: 'keyName'}
|
|
*/
|
|
AbstractClass.belongsTo = function (anotherClass, params) {
|
|
var methodName = params.as;
|
|
var fk = params.foreignKey;
|
|
|
|
this.schema.defineForeignKey(this.modelName, fk);
|
|
this.prototype['__finders__'] = this.prototype['__finders__'] || {}
|
|
|
|
this.prototype['__finders__'][methodName] = function (id, cb) {
|
|
anotherClass.find(id, function (err,inst) {
|
|
if (err) return cb(err);
|
|
if (inst[fk] === this.id) {
|
|
cb(null, inst);
|
|
} else {
|
|
cb(new Error('Permission denied'));
|
|
}
|
|
}.bind(this));
|
|
}
|
|
|
|
this.prototype[methodName] = function (p) {
|
|
if (p instanceof AbstractClass) { // acts as setter
|
|
this[fk] = p.id;
|
|
this.cachedRelations[methodName] = p;
|
|
} else if (typeof p === 'function') { // acts as async getter
|
|
this.__finders__[methodName](this[fk], p);
|
|
return this[fk];
|
|
} else if (typeof p === 'undefined') { // acts as sync getter
|
|
return this[fk];
|
|
} else { // setter
|
|
this[fk] = p;
|
|
}
|
|
};
|
|
|
|
};
|
|
|
|
/**
|
|
* Define scope
|
|
* TODO: describe behavior and usage examples
|
|
*/
|
|
AbstractClass.scope = function (name, params) {
|
|
defineScope(this, this, name, params);
|
|
};
|
|
|
|
function defineScope(cls, targetClass, name, params, methods) {
|
|
|
|
// collect meta info about scope
|
|
if (!cls._scopeMeta) {
|
|
cls._scopeMeta = {};
|
|
}
|
|
|
|
// anly make sence to add scope in meta if base and target classes
|
|
// are same
|
|
if (cls === targetClass) {
|
|
cls._scopeMeta[name] = params;
|
|
} else {
|
|
if (!targetClass._scopeMeta) {
|
|
targetClass._scopeMeta = {};
|
|
}
|
|
}
|
|
|
|
Object.defineProperty(cls, name, {
|
|
enumerable: false,
|
|
configurable: true,
|
|
get: function () {
|
|
var f = function caller(cond, cb) {
|
|
var actualCond;
|
|
if (arguments.length === 1) {
|
|
actualCond = {};
|
|
cb = cond;
|
|
} else if (arguments.length === 2) {
|
|
actualCond = cond;
|
|
} else {
|
|
throw new Error('Method only can be called with one or two arguments');
|
|
}
|
|
|
|
return targetClass.all(mergeParams(actualCond, caller._scope), cb);
|
|
};
|
|
f._scope = typeof params === 'function' ? params.call(this) : params;
|
|
f.build = build;
|
|
f.create = create;
|
|
f.destroyAll = destroyAll;
|
|
for (var i in methods) {
|
|
f[i] = methods[i].bind(this);
|
|
}
|
|
|
|
// define sub-scopes
|
|
Object.keys(targetClass._scopeMeta).forEach(function (name) {
|
|
Object.defineProperty(f, name, {
|
|
enumerable: false,
|
|
get: function () {
|
|
mergeParams(f._scope, targetClass._scopeMeta[name]);
|
|
return f;
|
|
}
|
|
});
|
|
}.bind(this));
|
|
return f;
|
|
}
|
|
});
|
|
|
|
// and it should have create/build methods with binded thisModelNameId param
|
|
function build(data) {
|
|
data = data || {};
|
|
return new targetClass(mergeParams(this._scope, {where:data}).where);
|
|
}
|
|
|
|
function create(data, cb) {
|
|
if (typeof data === 'function') {
|
|
cb = data;
|
|
data = {};
|
|
}
|
|
this.build(data).save(cb);
|
|
}
|
|
|
|
function destroyAll(id, cb) {
|
|
// implement me
|
|
}
|
|
|
|
function mergeParams(base, update) {
|
|
if (update.where) {
|
|
base.where = merge(base.where, update.where);
|
|
}
|
|
|
|
// overwrite order
|
|
if (update.order) {
|
|
base.order = update.order;
|
|
}
|
|
|
|
return base;
|
|
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Check whether `s` is not undefined
|
|
* @param {Mixed} s
|
|
* @return {Boolean} s is undefined
|
|
*/
|
|
function isdef(s) {
|
|
var undef;
|
|
return s !== undef;
|
|
}
|
|
|
|
/**
|
|
* Merge `base` and `update` params
|
|
* @param {Object} base - base object (updating this object)
|
|
* @param {Object} update - object with new data to update base
|
|
* @returns {Object} `base`
|
|
*/
|
|
function merge(base, update) {
|
|
base = base || {};
|
|
if (update) {
|
|
Object.keys(update).forEach(function (key) {
|
|
base[key] = update[key];
|
|
});
|
|
}
|
|
return base;
|
|
}
|
|
|
|
/**
|
|
* Define readonly property on object
|
|
*
|
|
* @param {Object} obj
|
|
* @param {String} key
|
|
* @param {Mixed} value
|
|
*/
|
|
function defineReadonlyProp(obj, key, value) {
|
|
Object.defineProperty(obj, key, {
|
|
writable: false,
|
|
enumerable: true,
|
|
configurable: true,
|
|
value: value
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Add object to cache
|
|
*/
|
|
function addToCache(constr, obj) {
|
|
touchCache(constr, obj.id);
|
|
constr.cache[obj.id] = obj;
|
|
}
|
|
|
|
/**
|
|
* Renew object position in LRU cache index
|
|
*/
|
|
function touchCache(constr, id) {
|
|
var cacheLimit = constr.CACHE_LIMIT || DEFAULT_CACHE_LIMIT;
|
|
|
|
var ind = constr.mru.indexOf(id);
|
|
if (~ind) constr.mru.splice(ind, 1);
|
|
if (constr.mru.length >= cacheLimit * 2) {
|
|
for (var i = 0; i < cacheLimit;i += 1) {
|
|
delete constr.cache[constr.mru[i]];
|
|
}
|
|
constr.mru.splice(0, cacheLimit);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Retrieve cached object
|
|
*/
|
|
function getCached(constr, id) {
|
|
if (id) touchCache(constr, id);
|
|
return id && constr.cache[id];
|
|
}
|
|
|
|
/**
|
|
* Clear cache (fully)
|
|
*
|
|
* removes both cache and LRU index
|
|
*
|
|
* @param {Class} constr - class constructor
|
|
*/
|
|
function clearCache(constr) {
|
|
constr.cache = {};
|
|
constr.mru = [];
|
|
}
|
|
|
|
/**
|
|
* Remove object from cache
|
|
*
|
|
* @param {Class} constr
|
|
* @param {id} id
|
|
*/
|
|
function removeFromCache(constr, id) {
|
|
var ind = constr.mru.indexOf(id);
|
|
if (!~ind) constr.mru.splice(ind, 1);
|
|
delete constr.cache[id];
|
|
}
|
|
|