596 lines
17 KiB
JavaScript
596 lines
17 KiB
JavaScript
/**
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* Module deps
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*/
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var Validatable = require('./validatable').Validatable;
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var Hookable = require('./hookable').Hookable;
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var util = require('util');
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var jutil = require('./jutil');
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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 constructor
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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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return this[_attr];
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},
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set: function (value) {
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this[_attr] = value;
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},
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configurable: true,
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enumerable: true
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});
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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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}.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.defineProperty = function (prop, params) {
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this.schema.defineProperty(this.modelName, prop, params);
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};
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/**
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* @param data [optional]
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* @param callback(err, obj)
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*/
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AbstractClass.create = function (data) {
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var modelName = this.modelName;
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// define callback manually
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var callback = arguments[arguments.length - 1];
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if (arguments.length == 0 || data === callback) {
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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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create();
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} else {
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obj = new this(data);
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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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this.constructor.cache[id] = 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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AbstractClass.exists = function exists(id, cb) {
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this.schema.adapter.exists(this.modelName, id, cb);
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};
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AbstractClass.find = function find(id, cb) {
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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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if (this.cache[data.id]) {
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obj = this.cache[data.id];
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substractDirtyAttributes(obj, data);
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this.call(obj, data);
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} else {
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obj = new this(data);
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this.cache[data.id] = obj;
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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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* Query collection of objects
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* @param params {where: {}, order: '', limit: 1, offset: 0,...}
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* @param cb (err, array of AbstractClass)
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*/
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AbstractClass.all = function all(params, cb) {
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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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// really questionable stuff
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// goal is obvious: to not create different instances for the same object
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// but the way it implemented...
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// we can lost some dirty state of object, for example
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// TODO: think about better implementation, test keeping dirty state
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if (constr.cache[d.id]) {
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obj = constr.cache[d.id];
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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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constr.cache[d.id] = 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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function substractDirtyAttributes(object, data) {
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Object.keys(object.toObject()).forEach(function (attr) {
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if (attr in data && 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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AbstractClass.destroyAll = function destroyAll(cb) {
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this.schema.adapter.destroyAll(this.modelName, function (err) {
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if (!err) {
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Object.keys(this.cache).forEach(function (id) {
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delete this.cache[id];
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}.bind(this));
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}
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cb(err);
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}.bind(this));
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};
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AbstractClass.count = function (cb) {
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this.schema.adapter.count(this.modelName, cb);
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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 (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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});
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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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AbstractClass.prototype._adapter = function () {
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return this.constructor.schema.adapter;
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};
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AbstractClass.prototype.propertyChanged = function (name) {
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return this[name + '_was'] !== this['_' + name];
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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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AbstractClass.prototype.destroy = function (cb) {
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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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delete this.constructor.cache[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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AbstractClass.prototype.updateAttribute = function (name, value, cb) {
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data = {};
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data[name] = value;
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this.updateAttributes(data, cb);
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};
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AbstractClass.prototype.updateAttributes = function updateAttributes(data, cb) {
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var inst = this;
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var model = this.constructor.modelName;
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Object.keys(data).forEach(function (key) {
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this[key] = data[key];
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}.bind(this));
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this.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.call(this);
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}
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}.bind(this));
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function update() {
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this.trigger('save', function (saveDone) {
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this.trigger('update', function (done) {
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Object.keys(data).forEach(function (key) {
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data[key] = this[key];
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}.bind(this));
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this._adapter().updateAttributes(model, this.id, data, function (err) {
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if (!err) {
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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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done.call(inst, function () {
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saveDone.call(inst, function () {
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cb(err);
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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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};
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/**
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* Checks is property changed based on current property and initial value
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* @param {attr} String - property name
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* @return Boolean
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*/
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AbstractClass.prototype.propertyChanged = function (attr) {
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return this['_' + attr] !== this[attr + '_was'];
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};
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AbstractClass.prototype.reload = function (cb) {
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var obj = this.constructor.cache[this.id];
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if (obj) {
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obj.reset();
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}
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this.constructor.find(this.id, cb);
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};
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AbstractClass.prototype.reset = function () {
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var obj = this;
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Object.keys(obj).forEach(function (k) {
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if (obj.propertyChanged(k)) {
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obj[k] = obj[k + '_was'];
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}
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});
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};
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// relations
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AbstractClass.hasMany = function (anotherClass, params) {
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var methodName = params.as; // or pluralize(anotherClass.modelName)
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var fk = params.foreignKey;
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// each instance of this class should have method named
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// pluralize(anotherClass.modelName)
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// which is actually just anotherClass.all({where: {thisModelNameId: this.id}}, cb);
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defineScope(this.prototype, anotherClass, methodName, function () {
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var x = {};
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x[fk] = this.id;
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return {where: x};
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}, {
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find: find,
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destroy: destroy
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});
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// obviously, anotherClass should have attribute called `fk`
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anotherClass.schema.defineForeignKey(anotherClass.modelName, fk);
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function find(id, cb) {
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anotherClass.find(id, function (err, inst) {
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if (err) return cb(err);
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if (inst[fk] === this.id) {
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cb(null, inst);
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} else {
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cb(new Error('Permission denied'));
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}
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}.bind(this));
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}
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function destroy(id, cb) {
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this.find(id, function (err, inst) {
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if (err) return cb(err);
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if (inst) {
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inst.destroy(cb);
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} else {
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cb(new Error('Not found'));
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}
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});
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}
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};
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AbstractClass.belongsTo = function (anotherClass, params) {
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var methodName = params.as;
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var fk = params.foreignKey;
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this.schema.defineForeignKey(anotherClass.modelName, fk);
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this.prototype[methodName] = function (p, cb) {
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if (p instanceof AbstractClass) { // acts as setter
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this[fk] = p.id;
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this.cachedRelations[methodName] = p;
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} else if (typeof p === 'function') { // acts as async getter
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this.find(this[fk], function (err, obj) {
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if (err) return p(err);
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this.cachedRelations[methodName] = obj;
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}.bind(this));
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} else if (!p) { // acts as sync getter
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return this.cachedRelations[methodName] || this[fk];
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}
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};
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};
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AbstractClass.scope = function (name, params) {
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defineScope(this, this, name, params);
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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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// anly make sence 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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Object.defineProperty(cls, name, {
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enumerable: false,
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configurable: true,
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get: function () {
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var f = function caller(cond, cb) {
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var actualCond;
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if (arguments.length === 1) {
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actualCond = {};
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cb = cond;
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} else if (arguments.length === 2) {
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actualCond = cond;
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} else {
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throw new Error('Method only can be called with one or two arguments');
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}
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return targetClass.all(mergeParams(actualCond, caller._scope), cb);
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};
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f._scope = typeof params === 'function' ? params.call(this) : params;
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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 methods) {
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f[i] = methods;
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}
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// define sub-scopes
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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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mergeParams(f._scope, targetClass._scopeMeta[name]);
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return f;
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}
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});
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}.bind(this));
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return f;
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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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return new targetClass(mergeParams(this._scope, {where:data}).where);
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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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function destroyAll(id, cb) {
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// implement me
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}
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function mergeParams(base, update) {
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if (update.where) {
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base.where = merge(base.where, update.where);
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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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return base;
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}
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}
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// helper methods
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//
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function isdef(s) {
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var undef;
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return s !== undef;
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}
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function merge(base, update) {
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base = base || {};
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if (update) {
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Object.keys(update).forEach(function (key) {
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base[key] = update[key];
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});
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}
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return base;
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}
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function defineReadonlyProp(obj, key, value) {
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Object.defineProperty(obj, key, {
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writable: false,
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enumerable: true,
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configurable: true,
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value: value
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});
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}
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