792 lines
23 KiB
JavaScript
792 lines
23 KiB
JavaScript
/**
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* Module exports class Model
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*/
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module.exports = DataAccessObject;
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/**
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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 validations = require('./validations.js');
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var ValidationError = validations.ValidationError;
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var List = require('./list.js');
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require('./relations.js');
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var Inclusion = require('./include.js');
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var Relation = require('./relations.js');
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var geo = require('./geo');
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var Memory = require('./connectors/memory').Memory;
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var fieldsToArray = require('./utils').fieldsToArray;
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/**
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* DAO class - base class for all persist objects
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* provides **common API** to access any database connector.
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* This class describes only abstract behavior layer, refer to `lib/connectors/*.js`
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* to learn more about specific connector implementations
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*
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* `DataAccessObject` mixes `Inclusion` 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 DataAccessObject() {
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if(DataAccessObject._mixins) {
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var self = this;
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var args = arguments;
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DataAccessObject._mixins.forEach(function(m) {
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m.call(self, args);
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});
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}
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}
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function idName(m) {
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return m.dataSource.idName ? m.dataSource.idName(m.modelName) : 'id';
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}
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function getIdValue(m, data) {
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return data && data[m.dataSource.idName(m.modelName)];
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}
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function setIdValue(m, data, value) {
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if(data) {
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data[idName(m)] = value;
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}
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}
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DataAccessObject._forDB = function (data) {
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if(!(this.dataSource.isRelational && this.dataSource.isRelational())) {
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return data;
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}
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var res = {};
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Object.keys(data).forEach(function (propName) {
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if (this.whatTypeName(propName) === 'JSON' || data[propName] instanceof Array) {
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res[propName] = JSON.stringify(data[propName]);
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} else {
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res[propName] = data[propName];
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}
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}.bind(this));
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return res;
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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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DataAccessObject.create = function (data, callback) {
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if (stillConnecting(this.dataSource, this, arguments)) return;
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var Model = this;
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var modelName = Model.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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if (!data) {
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data = {};
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}
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if (Array.isArray(data)) {
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var instances = [];
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var errors = Array(data.length);
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var gotError = false;
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var wait = data.length;
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if (wait === 0) callback(null, []);
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var instances = [];
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for (var i = 0; i < data.length; i += 1) {
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(function(d, i) {
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instances.push(Model.create(d, function(err, inst) {
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if (err) {
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errors[i] = err;
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gotError = true;
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}
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modelCreated();
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}));
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})(data[i], i);
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}
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return instances;
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function modelCreated() {
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if (--wait === 0) {
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callback(gotError ? errors : null, instances);
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}
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}
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}
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var obj;
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// if we come from save
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if (data instanceof Model && !getIdValue(this, data)) {
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obj = data;
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} else {
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obj = new Model(data);
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}
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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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create();
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} else {
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callback(new ValidationError(obj), obj);
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}
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}, data);
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function create() {
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obj.trigger('create', function(createDone) {
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obj.trigger('save', function(saveDone) {
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var _idName = idName(Model);
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this._adapter().create(modelName, this.constructor._forDB(obj.toObject(true)), function (err, id, rev) {
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if (id) {
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obj.__data[_idName] = id;
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obj.__dataWas[_idName] = id;
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defineReadonlyProp(obj, _idName, id);
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}
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if (rev) {
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obj._rev = rev;
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}
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if (err) {
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return callback(err, obj);
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}
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saveDone.call(obj, function () {
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createDone.call(obj, function () {
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callback(err, obj);
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});
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});
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}, obj);
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}, obj);
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}, obj);
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}
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// for chaining
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return obj;
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};
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/*!
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* Configure the remoting attributes for a given function
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* @param {Function} fn The function
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* @param {Object} options The options
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* @private
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*/
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function setRemoting(fn, options) {
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options = options || {};
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for(var opt in options) {
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if(options.hasOwnProperty(opt)) {
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fn[opt] = options[opt];
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}
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}
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fn.shared = true;
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}
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setRemoting(DataAccessObject.create, {
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description: 'Create a new instance of the model and persist it into the data source',
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accepts: {arg: 'data', type: 'object', description: 'Model instance data', http: {source: 'body'}},
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returns: {arg: 'data', type: 'object', root: true},
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http: {verb: 'post', path: '/'}
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});
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function stillConnecting(dataSource, obj, args) {
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if (dataSource.connected) return false; // Connected
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var method = args.callee;
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// Set up a callback after the connection is established to continue the method call
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dataSource.once('connected', function () {
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method.apply(obj, [].slice.call(args));
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});
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if (!dataSource.connecting) {
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dataSource.connect();
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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 a model instance
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* @param {Object} data The model instance data
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* @param {Function} [callback] The callback function
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*/
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DataAccessObject.upsert = DataAccessObject.updateOrCreate = function upsert(data, callback) {
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if (stillConnecting(this.dataSource, this, arguments)) return;
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var Model = this;
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if (!getIdValue(this, data)) return this.create(data, callback);
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if (this.dataSource.connector.updateOrCreate) {
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var inst = new Model(data);
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this.dataSource.connector.updateOrCreate(Model.modelName, inst.toObject(true), function (err, data) {
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var obj;
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if (data) {
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inst._initProperties(data);
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obj = inst;
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} else {
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obj = null;
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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.findById(getIdValue(this, data), 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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// upsert ~ remoting attributes
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setRemoting(DataAccessObject.upsert, {
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description: 'Update an existing model instance or insert a new one into the data source',
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accepts: {arg: 'data', type: 'object', description: 'Model instance data', http: {source: 'body'}},
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returns: {arg: 'data', type: 'object', root: true},
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http: {verb: 'put', path: '/'}
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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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* if not found, create using data provided as second argument
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*
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* @param {Object} query - search conditions: {where: {test: 'me'}}.
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* @param {Object} data - object to create.
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* @param {Function} cb - callback called with (err, instance)
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*/
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DataAccessObject.findOrCreate = function findOrCreate(query, data, callback) {
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if (typeof query === 'undefined') {
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query = {where: {}};
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}
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if (typeof data === 'function' || typeof data === 'undefined') {
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callback = data;
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data = query && query.where;
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}
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if (typeof callback === 'undefined') {
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callback = function () {};
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}
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var t = this;
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this.findOne(query, function (err, record) {
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if (err) return callback(err);
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if (record) return callback(null, record);
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t.create(data, callback);
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});
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};
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/**
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* Check whether a model instance exists 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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DataAccessObject.exists = function exists(id, cb) {
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if (stillConnecting(this.dataSource, this, arguments)) return;
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if (id) {
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this.dataSource.connector.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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// exists ~ remoting attributes
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setRemoting(DataAccessObject.exists, {
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description: 'Check whether a model instance exists in the data source',
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accepts: {arg: 'id', type: 'any', description: 'Model id'},
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returns: {arg: 'exists', type: 'any'},
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http: {verb: 'get', path: '/exists'}
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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 - primary key value
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* @param {Function} cb - callback called with (err, instance)
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*/
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DataAccessObject.findById = function find(id, cb) {
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if (stillConnecting(this.dataSource, this, arguments)) return;
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this.dataSource.connector.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 (!getIdValue(this, data)) {
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setIdValue(this, data, id);
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}
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obj = new this();
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obj._initProperties(data, false);
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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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// find ~ remoting attributes
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setRemoting(DataAccessObject.findById, {
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description: 'Find a model instance by id from the data source',
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accepts: {arg: 'id', type: 'any', description: 'Model id'},
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returns: {arg: 'data', type: 'any', root: true},
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http: {verb: 'get', path: '/:id'}
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});
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// alias function for backwards compat.
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DataAccessObject.all = function () {
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DataAccessObject.find.apply(this, arguments);
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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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* - include: String, Object or Array. See DataAccessObject.include documentation.
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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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DataAccessObject.find = function find(params, cb) {
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if (stillConnecting(this.dataSource, 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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params = params || {};
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var fields = params.fields;
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var near = params && geo.nearFilter(params.where);
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var supportsGeo = !!this.dataSource.connector.buildNearFilter;
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// normalize fields as array of included property names
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if(fields) {
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params.fields = fieldsToArray(fields, Object.keys(this.properties));
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}
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if(near) {
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if(supportsGeo) {
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// convert it
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this.dataSource.connector.buildNearFilter(params, near);
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} else if(params.where) {
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// do in memory query
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// using all documents
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this.dataSource.connector.all(this.modelName, {}, function (err, data) {
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var memory = new Memory();
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var modelName = constr.modelName;
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if(err) {
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cb(err);
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} else if(Array.isArray(data)) {
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memory.define({
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properties: constr.dataSource.definitions[constr.modelName].properties,
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settings: constr.dataSource.definitions[constr.modelName].settings,
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model: constr
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});
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data.forEach(function (obj) {
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memory.create(modelName, obj, function () {
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// noop
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});
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});
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memory.all(modelName, params, cb);
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} else {
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cb(null, []);
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}
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}.bind(this));
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// already handled
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return;
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}
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}
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this.dataSource.connector.all(this.modelName, params, function (err, data) {
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if (data && data.forEach) {
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data.forEach(function (d, i) {
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var obj = new constr;
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obj._initProperties(d, false, params.fields);
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if (params && params.include && params.collect) {
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data[i] = obj.__cachedRelations[params.collect];
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} else {
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data[i] = obj;
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}
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});
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if (data && data.countBeforeLimit) {
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data.countBeforeLimit = data.countBeforeLimit;
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}
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if(!supportsGeo && near) {
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data = geo.filter(data, near);
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}
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cb(err, data);
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}
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else
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cb(err, []);
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});
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};
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// all ~ remoting attributes
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setRemoting(DataAccessObject.find, {
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description: 'Find all instances of the model matched by filter from the data source',
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accepts: {arg: 'filter', type: 'object', description: 'Filter defining fields, where, orderBy, offset, and limit'},
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returns: {arg: 'data', type: 'array', root: true},
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http: {verb: 'get', path: '/'}
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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: {where: {test: 'me'}}
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* @param {Function} cb - callback called with (err, instance)
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*/
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DataAccessObject.findOne = function findOne(params, cb) {
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if (stillConnecting(this.dataSource, 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.find(params, function (err, collection) {
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if (err || !collection || !collection.length > 0) return cb(err, null);
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cb(err, collection[0]);
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});
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};
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setRemoting(DataAccessObject.findOne, {
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description: 'Find first instance of the model matched by filter from the data source',
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accepts: {arg: 'filter', type: 'object', description: 'Filter defining fields, where, orderBy, offset, and limit'},
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returns: {arg: 'data', type: 'object', root: true},
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http: {verb: 'get', path: '/findOne'}
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});
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/**
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* Destroy all matching records
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* @param {Object} [where] An object that defines the criteria
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* @param {Function} [cb] - callback called with (err)
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*/
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DataAccessObject.remove =
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DataAccessObject.deleteAll =
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DataAccessObject.destroyAll = function destroyAll(where, cb) {
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if (stillConnecting(this.dataSource, this, arguments)) return;
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if(!cb && 'function' === typeof where) {
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cb = where;
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where = undefined;
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}
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if(!where) {
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this.dataSource.connector.destroyAll(this.modelName, function (err, data) {
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cb && cb(err, data);
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}.bind(this));
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} else {
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// Support an optional where object
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this.dataSource.connector.destroyAll(this.modelName, where, function (err, data) {
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cb && cb(err, data);
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}.bind(this));
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}
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};
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/**
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* Destroy a record by id
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* @param {*} id The id value
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* @param {Function} cb - callback called with (err)
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*/
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DataAccessObject.removeById =
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DataAccessObject.deleteById =
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DataAccessObject.destroyById = function deleteById(id, cb) {
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if (stillConnecting(this.dataSource, this, arguments)) return;
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this.dataSource.connector.destroy(this.modelName, id, function (err) {
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if ('function' === typeof cb) {
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cb(err);
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}
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}.bind(this));
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};
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// deleteById ~ remoting attributes
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setRemoting(DataAccessObject.deleteById, {
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description: 'Delete a model instance by id from the data source',
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accepts: {arg: 'id', type: 'any', description: 'Model id'},
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http: {verb: 'del', path: '/:id'}
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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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DataAccessObject.count = function (where, cb) {
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if (stillConnecting(this.dataSource, 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.dataSource.connector.count(this.modelName, cb, where);
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};
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// count ~ remoting attributes
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setRemoting(DataAccessObject.count, {
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description: 'Count instances of the model matched by where from the data source',
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accepts: {arg: 'where', type: 'object', description: 'Criteria to match model instances'},
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returns: {arg: 'count', type: 'number'},
|
|
http: {verb: 'get', path: '/count'}
|
|
});
|
|
|
|
|
|
/**
|
|
* Save instance. When instance haven't id, create method called instead.
|
|
* Triggers: validate, save, update | create
|
|
* @param options {validate: true, throws: false} [optional]
|
|
* @param callback(err, obj)
|
|
*/
|
|
DataAccessObject.prototype.save = function (options, callback) {
|
|
if (stillConnecting(this.constructor.dataSource, this, arguments)) return;
|
|
|
|
if (typeof options == 'function') {
|
|
callback = options;
|
|
options = {};
|
|
}
|
|
|
|
callback = callback || function () {};
|
|
options = options || {};
|
|
|
|
if (!('validate' in options)) {
|
|
options.validate = true;
|
|
}
|
|
if (!('throws' in options)) {
|
|
options.throws = false;
|
|
}
|
|
|
|
var inst = this;
|
|
var data = inst.toObject(true);
|
|
var Model = this.constructor;
|
|
var modelName = Model.modelName;
|
|
|
|
if (!getIdValue(Model, this)) {
|
|
return Model.create(this, callback);
|
|
}
|
|
|
|
// validate first
|
|
if (!options.validate) {
|
|
return save();
|
|
}
|
|
|
|
inst.isValid(function (valid) {
|
|
if (valid) {
|
|
save();
|
|
} else {
|
|
var err = new ValidationError(inst);
|
|
// throws option is dangerous for async usage
|
|
if (options.throws) {
|
|
throw err;
|
|
}
|
|
callback(err, inst);
|
|
}
|
|
});
|
|
|
|
// then save
|
|
function save() {
|
|
inst.trigger('save', function (saveDone) {
|
|
inst.trigger('update', function (updateDone) {
|
|
inst._adapter().save(modelName, inst.constructor._forDB(data), function (err) {
|
|
if (err) {
|
|
return callback(err, inst);
|
|
}
|
|
inst._initProperties(data, false);
|
|
updateDone.call(inst, function () {
|
|
saveDone.call(inst, function () {
|
|
callback(err, inst);
|
|
});
|
|
});
|
|
});
|
|
}, data);
|
|
}, data);
|
|
}
|
|
};
|
|
|
|
|
|
DataAccessObject.prototype.isNewRecord = function () {
|
|
return !getIdValue(this.constructor, this);
|
|
};
|
|
|
|
/**
|
|
* Return connector of current record
|
|
* @private
|
|
*/
|
|
DataAccessObject.prototype._adapter = function () {
|
|
return this.dataSource.connector;
|
|
};
|
|
|
|
/**
|
|
* Delete object from persistence
|
|
*
|
|
* @triggers `destroy` hook (async) before and after destroying object
|
|
*/
|
|
DataAccessObject.prototype.remove =
|
|
DataAccessObject.prototype.delete =
|
|
DataAccessObject.prototype.destroy = function (cb) {
|
|
if (stillConnecting(this.constructor.dataSource, this, arguments)) return;
|
|
|
|
this.trigger('destroy', function (destroyed) {
|
|
this._adapter().destroy(this.constructor.modelName, getIdValue(this.constructor, this), function (err) {
|
|
if (err) {
|
|
return cb(err);
|
|
}
|
|
|
|
destroyed(function () {
|
|
if(cb) cb();
|
|
});
|
|
}.bind(this));
|
|
});
|
|
};
|
|
|
|
|
|
/**
|
|
* Update single attribute
|
|
*
|
|
* equals to `updateAttributes({name: value}, cb)
|
|
*
|
|
* @param {String} name - name of property
|
|
* @param {Mixed} value - value of property
|
|
* @param {Function} callback - callback called with (err, instance)
|
|
*/
|
|
DataAccessObject.prototype.updateAttribute = function updateAttribute(name, value, callback) {
|
|
var data = {};
|
|
data[name] = value;
|
|
this.updateAttributes(data, callback);
|
|
};
|
|
|
|
/**
|
|
* Update set of attributes
|
|
*
|
|
* this method performs validation before updating
|
|
*
|
|
* @trigger `validation`, `save` and `update` hooks
|
|
* @param {Object} data - data to update
|
|
* @param {Function} callback - callback called with (err, instance)
|
|
*/
|
|
DataAccessObject.prototype.updateAttributes = function updateAttributes(data, cb) {
|
|
if (stillConnecting(this.constructor.dataSource, this, arguments)) return;
|
|
|
|
var inst = this;
|
|
var model = this.constructor.modelName;
|
|
|
|
if (typeof data === 'function') {
|
|
cb = data;
|
|
data = null;
|
|
}
|
|
|
|
if (!data) {
|
|
data = {};
|
|
}
|
|
|
|
// update instance's properties
|
|
Object.keys(data).forEach(function (key) {
|
|
inst[key] = data[key];
|
|
});
|
|
|
|
inst.isValid(function (valid) {
|
|
if (!valid) {
|
|
if (cb) {
|
|
cb(new ValidationError(inst), inst);
|
|
}
|
|
} else {
|
|
inst.trigger('save', function (saveDone) {
|
|
inst.trigger('update', function (done) {
|
|
|
|
Object.keys(data).forEach(function (key) {
|
|
inst[key] = data[key];
|
|
});
|
|
|
|
inst._adapter().updateAttributes(model, getIdValue(inst.constructor, inst), inst.constructor._forDB(data), function (err) {
|
|
if (!err) {
|
|
// update _was attrs
|
|
Object.keys(data).forEach(function (key) {
|
|
inst.__dataWas[key] = inst.__data[key];
|
|
});
|
|
}
|
|
done.call(inst, function () {
|
|
saveDone.call(inst, function () {
|
|
cb(err, inst);
|
|
});
|
|
});
|
|
});
|
|
}, data);
|
|
}, data);
|
|
}
|
|
}, data);
|
|
};
|
|
|
|
// updateAttributes ~ remoting attributes
|
|
setRemoting(DataAccessObject.prototype.updateAttributes, {
|
|
description: 'Update attributes for a model instance and persist it into the data source',
|
|
accepts: {arg: 'data', type: 'object', http: {source: 'body'}, description: 'An object of model property name/value pairs'},
|
|
returns: {arg: 'data', type: 'object', root: true},
|
|
http: {verb: 'put', path: '/'}
|
|
});
|
|
|
|
|
|
/**
|
|
* Reload object from persistence
|
|
*
|
|
* @requires `id` member of `object` to be able to call `find`
|
|
* @param {Function} callback - called with (err, instance) arguments
|
|
*/
|
|
DataAccessObject.prototype.reload = function reload(callback) {
|
|
if (stillConnecting(this.constructor.dataSource, this, arguments)) return;
|
|
|
|
this.constructor.findById(getIdValue(this.constructor, this), callback);
|
|
};
|
|
|
|
setRemoting(DataAccessObject.prototype.reload, {
|
|
description: 'Reload a model instance from the data source',
|
|
returns: {arg: 'data', type: 'object', root: true}
|
|
});
|
|
|
|
/**
|
|
* 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
|
|
});
|
|
}
|
|
|
|
// jutil.mixin(DataAccessObject, validations.Validatable);
|
|
jutil.mixin(DataAccessObject, Inclusion);
|
|
jutil.mixin(DataAccessObject, Relation);
|