655 lines
20 KiB
JavaScript
655 lines
20 KiB
JavaScript
/*!
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* Module Dependencies.
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*/
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var registry = require('../registry');
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var assert = require('assert');
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var SharedClass = require('strong-remoting').SharedClass;
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var extend = require('util')._extend;
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var stringUtils = require('underscore.string');
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/**
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* The base class for **all models**.
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*
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* **Inheriting from `Model`**
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*
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* ```js
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* var properties = {...};
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* var options = {...};
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* var MyModel = loopback.Model.extend('MyModel', properties, options);
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* ```
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*
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* **Options**
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*
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* - `trackChanges` - If true, changes to the model will be tracked. **Required
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* for replication.**
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*
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* **Events**
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*
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* #### Event: `changed`
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*
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* Emitted after a model has been successfully created, saved, or updated.
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*
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* ```js
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* MyModel.on('changed', function(inst) {
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* console.log('model with id %s has been changed', inst.id);
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* // => model with id 1 has been changed
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* });
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* ```
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*
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* #### Event: `deleted`
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*
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* Emitted after an individual model has been deleted.
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*
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* ```js
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* MyModel.on('deleted', function(inst) {
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* console.log('model with id %s has been deleted', inst.id);
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* // => model with id 1 has been deleted
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* });
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* ```
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*
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* #### Event: `deletedAll`
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*
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* Emitted after an individual model has been deleted.
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*
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* ```js
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* MyModel.on('deletedAll', function(where) {
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* if(where) {
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* console.log('all models where', where, 'have been deleted');
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* // => all models where
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* // => {price: {gt: 100}}
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* // => have been deleted
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* }
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* });
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* ```
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*
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* #### Event: `attached`
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*
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* Emitted after a `Model` has been attached to an `app`.
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*
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* #### Event: `dataSourceAttached`
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*
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* Emitted after a `Model` has been attached to a `DataSource`.
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*
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* @class
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* @param {Object} data
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* @property {String} modelName The name of the model
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* @property {DataSource} dataSource
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*/
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var Model = module.exports = registry.modelBuilder.define('Model');
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/*!
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* Called when a model is extended.
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*/
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Model.setup = function () {
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var ModelCtor = this;
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var options = this.settings;
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// create a sharedClass
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var sharedClass = ModelCtor.sharedClass = new SharedClass(
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ModelCtor.modelName,
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ModelCtor,
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options.remoting
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);
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// support remoting prototype methods
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ModelCtor.sharedCtor = function (data, id, fn) {
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var ModelCtor = this;
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if(typeof data === 'function') {
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fn = data;
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data = null;
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id = null;
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} else if (typeof id === 'function') {
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fn = id;
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if(typeof data !== 'object') {
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id = data;
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data = null;
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} else {
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id = null;
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}
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}
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if(id && data) {
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var model = new ModelCtor(data);
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model.id = id;
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fn(null, model);
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} else if(data) {
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fn(null, new ModelCtor(data));
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} else if(id) {
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ModelCtor.findById(id, function (err, model) {
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if(err) {
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fn(err);
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} else if(model) {
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fn(null, model);
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} else {
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err = new Error('could not find a model with id ' + id);
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err.statusCode = 404;
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fn(err);
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}
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});
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} else {
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fn(new Error('must specify an id or data'));
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}
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}
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var idDesc = ModelCtor.modelName + ' id';
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ModelCtor.sharedCtor.accepts = [
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{arg: 'id', type: 'any', required: true, http: {source: 'path'},
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description: idDesc}
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// {arg: 'instance', type: 'object', http: {source: 'body'}}
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];
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ModelCtor.sharedCtor.http = [
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{path: '/:id'}
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];
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ModelCtor.sharedCtor.returns = {root: true};
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// before remote hook
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ModelCtor.beforeRemote = function (name, fn) {
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var self = this;
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if(this.app) {
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var remotes = this.app.remotes();
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var className = self.modelName;
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remotes.before(className + '.' + name, function (ctx, next) {
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fn(ctx, ctx.result, next);
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});
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} else {
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var args = arguments;
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this.once('attached', function () {
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self.beforeRemote.apply(self, args);
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});
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}
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};
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// after remote hook
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ModelCtor.afterRemote = function (name, fn) {
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var self = this;
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if(this.app) {
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var remotes = this.app.remotes();
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var className = self.modelName;
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remotes.after(className + '.' + name, function (ctx, next) {
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fn(ctx, ctx.result, next);
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});
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} else {
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var args = arguments;
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this.once('attached', function () {
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self.afterRemote.apply(self, args);
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});
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}
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};
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// resolve relation functions
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sharedClass.resolve(function resolver(define) {
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var relations = ModelCtor.relations || {};
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// get the relations
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for (var relationName in relations) {
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var relation = relations[relationName];
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if (relation.type === 'belongsTo') {
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ModelCtor.belongsToRemoting(relationName, relation, define)
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} else if (relation.type === 'hasOne') {
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ModelCtor.hasOneRemoting(relationName, relation, define)
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} else if (
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relation.type === 'hasMany' ||
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relation.type === 'embedsMany' ||
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relation.type === 'referencesMany') {
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ModelCtor.hasManyRemoting(relationName, relation, define);
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}
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}
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// handle scopes
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var scopes = ModelCtor.scopes || {};
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for (var scopeName in scopes) {
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ModelCtor.scopeRemoting(scopeName, scopes[scopeName], define);
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}
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});
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return ModelCtor;
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};
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/*!
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* Get the reference to ACL in a lazy fashion to avoid race condition in require
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*/
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var _aclModel = null;
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Model._ACL = function getACL(ACL) {
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if(ACL !== undefined) {
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// The function is used as a setter
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_aclModel = ACL;
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}
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if(_aclModel) {
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return _aclModel;
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}
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var aclModel = require('./acl').ACL;
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_aclModel = registry.getModelByType(aclModel);
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return _aclModel;
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};
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/**
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* Check if the given access token can invoke the method
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*
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* @param {AccessToken} token The access token
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* @param {*} modelId The model ID.
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* @param {SharedMethod} sharedMethod The method in question
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* @param {Object} ctx The remote invocation context
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* @callback {Function} callback The callback function
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* @param {String|Error} err The error object
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* @param {Boolean} allowed True if the request is allowed; false otherwise.
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*/
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Model.checkAccess = function(token, modelId, sharedMethod, ctx, callback) {
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var ANONYMOUS = require('./access-token').ANONYMOUS;
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token = token || ANONYMOUS;
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var aclModel = Model._ACL();
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ctx = ctx || {};
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if(typeof ctx === 'function' && callback === undefined) {
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callback = ctx;
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ctx = {};
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}
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aclModel.checkAccessForContext({
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accessToken: token,
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model: this,
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property: sharedMethod.name,
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method: sharedMethod.name,
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sharedMethod: sharedMethod,
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modelId: modelId,
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accessType: this._getAccessTypeForMethod(sharedMethod),
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remotingContext: ctx
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}, function(err, accessRequest) {
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if(err) return callback(err);
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callback(null, accessRequest.isAllowed());
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});
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};
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/*!
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* Determine the access type for the given `RemoteMethod`.
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*
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* @api private
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* @param {RemoteMethod} method
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*/
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Model._getAccessTypeForMethod = function(method) {
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if(typeof method === 'string') {
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method = {name: method};
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}
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assert(
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typeof method === 'object',
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'method is a required argument and must be a RemoteMethod object'
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);
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var ACL = Model._ACL();
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switch(method.name) {
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case'create':
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return ACL.WRITE;
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case 'updateOrCreate':
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return ACL.WRITE;
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case 'upsert':
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return ACL.WRITE;
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case 'exists':
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return ACL.READ;
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case 'findById':
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return ACL.READ;
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case 'find':
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return ACL.READ;
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case 'findOne':
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return ACL.READ;
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case 'destroyById':
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return ACL.WRITE;
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case 'deleteById':
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return ACL.WRITE;
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case 'removeById':
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return ACL.WRITE;
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case 'count':
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return ACL.READ;
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default:
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return ACL.EXECUTE;
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}
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}
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/**
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* Get the `Application` the Model is attached to.
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*
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* @callback {Function} callback
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* @param {Error} err
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* @param {Application} app
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* @end
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*/
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Model.getApp = function(callback) {
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var Model = this;
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if(this.app) {
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callback(null, this.app);
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} else {
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Model.once('attached', function() {
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assert(Model.app);
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callback(null, Model.app);
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});
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}
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}
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/**
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* Enable remote invocation for the method with the given name.
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* See [Remote methods and hooks](http://docs.strongloop.com/display/LB/Remote+methods+and+hooks for more information.
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* Static method example:
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* ```js
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* Model.myMethod();
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* Model.remoteMethod('myMethod');
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* ```
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*
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* @param {String} name The name of the method.
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* @param {Object} options The remoting options.
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*/
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Model.remoteMethod = function(name, options) {
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if(options.isStatic === undefined) {
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options.isStatic = true;
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}
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this.sharedClass.defineMethod(name, options);
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}
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Model.belongsToRemoting = function(relationName, relation, define) {
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var modelName = relation.modelTo && relation.modelTo.modelName;
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modelName = modelName || 'PersistedModel';
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var fn = this.prototype[relationName];
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var pathName = (relation.options.http && relation.options.http.path) || relationName;
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define('__get__' + relationName, {
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isStatic: false,
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http: {verb: 'get', path: '/' + pathName},
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accepts: {arg: 'refresh', type: 'boolean', http: {source: 'query'}},
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description: 'Fetches belongsTo relation ' + relationName,
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returns: {arg: relationName, type: modelName, root: true}
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}, fn);
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}
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Model.hasOneRemoting = function(relationName, relation, define) {
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var fn = this.prototype[relationName];
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var pathName = (relation.options.http && relation.options.http.path) || relationName;
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define('__get__' + relationName, {
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isStatic: false,
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http: {verb: 'get', path: '/' + pathName},
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accepts: {arg: 'refresh', type: 'boolean', http: {source: 'query'}},
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description: 'Fetches hasOne relation ' + relationName,
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returns: {arg: relationName, type: relation.modelTo.modelName, root: true}
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}, fn);
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}
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Model.hasManyRemoting = function (relationName, relation, define) {
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var pathName = (relation.options.http && relation.options.http.path) || relationName;
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var toModelName = relation.modelTo.modelName;
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var findByIdFunc = this.prototype['__findById__' + relationName];
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define('__findById__' + relationName, {
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isStatic: false,
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http: {verb: 'get', path: '/' + pathName + '/:fk'},
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accepts: {arg: 'fk', type: 'any',
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description: 'Foreign key for ' + relationName, required: true,
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http: {source: 'path'}},
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description: 'Find a related item by id for ' + relationName,
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returns: {arg: 'result', type: toModelName, root: true}
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}, findByIdFunc);
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var destroyByIdFunc = this.prototype['__destroyById__' + relationName];
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define('__destroyById__' + relationName, {
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isStatic: false,
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http: {verb: 'delete', path: '/' + pathName + '/:fk'},
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accepts: {arg: 'fk', type: 'any',
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description: 'Foreign key for ' + relationName, required: true,
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http: {source: 'path'}},
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description: 'Delete a related item by id for ' + relationName,
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returns: {}
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}, destroyByIdFunc);
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var updateByIdFunc = this.prototype['__updateById__' + relationName];
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define('__updateById__' + relationName, {
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isStatic: false,
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http: {verb: 'put', path: '/' + pathName + '/:fk'},
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accepts: [
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{arg: 'fk', type: 'any',
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description: 'Foreign key for ' + relationName, required: true,
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http: {source: 'path'}},
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{arg: 'data', type: toModelName, http: {source: 'body'}}
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],
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description: 'Update a related item by id for ' + relationName,
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returns: {arg: 'result', type: toModelName, root: true}
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}, updateByIdFunc);
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if (relation.modelThrough || relation.type === 'referencesMany') {
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var modelThrough = relation.modelThrough || relation.modelTo;
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var addFunc = this.prototype['__link__' + relationName];
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define('__link__' + relationName, {
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isStatic: false,
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http: {verb: 'put', path: '/' + pathName + '/rel/:fk'},
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accepts: {arg: 'fk', type: 'any',
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description: 'Foreign key for ' + relationName, required: true,
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http: {source: 'path'}},
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description: 'Add a related item by id for ' + relationName,
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returns: {arg: relationName, type: modelThrough.modelName, root: true}
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}, addFunc);
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var removeFunc = this.prototype['__unlink__' + relationName];
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define('__unlink__' + relationName, {
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isStatic: false,
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http: {verb: 'delete', path: '/' + pathName + '/rel/:fk'},
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accepts: {arg: 'fk', type: 'any',
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description: 'Foreign key for ' + relationName, required: true,
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http: {source: 'path'}},
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description: 'Remove the ' + relationName + ' relation to an item by id',
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returns: {}
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}, removeFunc);
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// FIXME: [rfeng] How to map a function with callback(err, true|false) to HEAD?
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// true --> 200 and false --> 404?
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var existsFunc = this.prototype['__exists__' + relationName];
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define('__exists__' + relationName, {
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isStatic: false,
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http: {verb: 'head', path: '/' + pathName + '/rel/:fk'},
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accepts: {arg: 'fk', type: 'any',
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description: 'Foreign key for ' + relationName, required: true,
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http: {source: 'path'}},
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description: 'Check the existence of ' + relationName + ' relation to an item by id',
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returns: {arg: 'exists', type: 'boolean', root: true},
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rest: {
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// After hook to map exists to 200/404 for HEAD
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after: function(ctx, cb) {
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if(ctx.result === false) {
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var modelName = ctx.method.sharedClass.name;
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var id = ctx.getArgByName('id');
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var msg = 'Unknown "' + modelName + '" id "' + id + '".';
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var error = new Error(msg);
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error.statusCode = error.status = 404;
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cb(error);
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} else {
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cb();
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}
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}
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}
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}, existsFunc);
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}
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};
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Model.scopeRemoting = function(scopeName, scope, define) {
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var pathName = (scope.options && scope.options.http && scope.options.http.path)
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|| scopeName;
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var isStatic = scope.isStatic;
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var toModelName = scope.modelTo.modelName;
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define('__get__' + scopeName, {
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isStatic: isStatic,
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http: {verb: 'get', path: '/' + pathName},
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accepts: {arg: 'filter', type: 'object'},
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description: 'Queries ' + scopeName + ' of ' + this.modelName + '.',
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returns: {arg: scopeName, type: [toModelName], root: true}
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});
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define('__create__' + scopeName, {
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isStatic: isStatic,
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http: {verb: 'post', path: '/' + pathName},
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accepts: {arg: 'data', type: toModelName, http: {source: 'body'}},
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description: 'Creates a new instance in ' + scopeName + ' of this model.',
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returns: {arg: 'data', type: toModelName, root: true}
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});
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define('__delete__' + scopeName, {
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isStatic: isStatic,
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http: {verb: 'delete', path: '/' + pathName},
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description: 'Deletes all ' + scopeName + ' of this model.'
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});
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};
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Model.nestRemoting = function(relationName, options, cb) {
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if (typeof options === 'function' && !cb) {
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cb = options;
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options = {};
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}
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options = options || {};
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var regExp = /^__([^_]+)__([^_]+)$/;
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var relation = this.relations[relationName];
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if (relation && relation.modelTo && relation.modelTo.sharedClass) {
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var self = this;
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var sharedClass = this.sharedClass;
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var sharedToClass = relation.modelTo.sharedClass;
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var toModelName = relation.modelTo.modelName;
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var pathName = options.pathName || relation.options.path || relationName;
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var paramName = options.paramName || 'nk';
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var http = [].concat(sharedToClass.http || [])[0];
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if (relation.multiple) {
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var httpPath = pathName + '/:' + paramName;
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var acceptArgs = [
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{
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arg: paramName, type: 'any', http: { source: 'path' },
|
|
description: 'Foreign key for ' + relation.name,
|
|
required: true
|
|
}
|
|
];
|
|
} else {
|
|
var httpPath = pathName;
|
|
var acceptArgs = [];
|
|
}
|
|
|
|
// A method should return the method name to use, if it is to be
|
|
// included as a nested method - a falsy return value will skip.
|
|
var filter = cb || options.filterMethod || function(method, relation) {
|
|
var matches = method.name.match(regExp);
|
|
if (matches) {
|
|
return '__' + matches[1] + '__' + relation.name + '__' + matches[2];
|
|
}
|
|
};
|
|
|
|
sharedToClass.methods().forEach(function(method) {
|
|
var methodName;
|
|
if (!method.isStatic && (methodName = filter(method, relation))) {
|
|
var prefix = relation.multiple ? '__findById__' : '__get__';
|
|
var getterName = options.getterName || (prefix + relationName);
|
|
|
|
var getterFn = relation.modelFrom.prototype[getterName];
|
|
if (typeof getterFn !== 'function') {
|
|
throw new Error('Invalid remote method: `' + getterName + '`');
|
|
}
|
|
|
|
var nestedFn = relation.modelTo.prototype[method.name];
|
|
if (typeof nestedFn !== 'function') {
|
|
throw new Error('Invalid remote method: `' + method.name + '`');
|
|
}
|
|
|
|
var opts = {};
|
|
|
|
opts.accepts = acceptArgs.concat(method.accepts || []);
|
|
opts.returns = [].concat(method.returns || []);
|
|
opts.description = method.description;
|
|
opts.rest = extend({}, method.rest || {});
|
|
opts.rest.delegateTo = method.name;
|
|
|
|
opts.http = [];
|
|
var routes = [].concat(method.http || []);
|
|
routes.forEach(function(route) {
|
|
if (route.path) {
|
|
var copy = extend({}, route);
|
|
copy.path = httpPath + route.path;
|
|
opts.http.push(copy);
|
|
}
|
|
});
|
|
|
|
if (relation.multiple) {
|
|
sharedClass.defineMethod(methodName, opts, function(fkId) {
|
|
var args = Array.prototype.slice.call(arguments, 1);
|
|
var last = args[args.length - 1];
|
|
var cb = typeof last === 'function' ? last : null;
|
|
this[getterName](fkId, function(err, inst) {
|
|
if (err && cb) return cb(err);
|
|
if (inst instanceof relation.modelTo) {
|
|
nestedFn.apply(inst, args);
|
|
} else if (cb) {
|
|
cb(err, null);
|
|
}
|
|
});
|
|
}, method.isStatic);
|
|
} else {
|
|
sharedClass.defineMethod(methodName, opts, function() {
|
|
var args = Array.prototype.slice.call(arguments);
|
|
var last = args[args.length - 1];
|
|
var cb = typeof last === 'function' ? last : null;
|
|
this[getterName](function(err, inst) {
|
|
if (err && cb) return cb(err);
|
|
if (inst instanceof relation.modelTo) {
|
|
nestedFn.apply(inst, args);
|
|
} else if (cb) {
|
|
cb(err, null);
|
|
}
|
|
});
|
|
}, method.isStatic);
|
|
}
|
|
}
|
|
});
|
|
|
|
if (options.hooks === false) return; // don't inherit before/after hooks
|
|
|
|
self.once('mounted', function(app, sc, remotes) {
|
|
var listenerTree = extend({}, remotes.listenerTree || {});
|
|
listenerTree.before = listenerTree.before || {};
|
|
listenerTree.after = listenerTree.after || {};
|
|
|
|
var beforeListeners = remotes.listenerTree.before[toModelName] || {};
|
|
var afterListeners = remotes.listenerTree.after[toModelName] || {};
|
|
|
|
sharedClass.methods().forEach(function(method) {
|
|
var delegateTo = method.rest && method.rest.delegateTo;
|
|
if (delegateTo) {
|
|
var before = method.isStatic ? beforeListeners : beforeListeners['prototype'];
|
|
var after = method.isStatic ? afterListeners : afterListeners['prototype'];
|
|
var m = method.isStatic ? method.name : 'prototype.' + method.name;
|
|
if (before[delegateTo]) {
|
|
self.beforeRemote(m, function(ctx, result, next) {
|
|
before[delegateTo]._listeners.call(null, ctx, next);
|
|
});
|
|
}
|
|
if (after[delegateTo]) {
|
|
self.afterRemote(m, function(ctx, result, next) {
|
|
after[delegateTo]._listeners.call(null, ctx, next);
|
|
});
|
|
}
|
|
}
|
|
});
|
|
});
|
|
|
|
} else {
|
|
throw new Error('Relation `' + relationName + '` does not exist for model `' + this.modelName + '`');
|
|
}
|
|
};
|
|
|
|
// setup the initial model
|
|
Model.setup();
|
|
|