125 lines
3.1 KiB
JavaScript
125 lines
3.1 KiB
JavaScript
// Copyright IBM Corp. 2013,2019. All Rights Reserved.
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// Node module: loopback-datasource-juggler
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// This file is licensed under the MIT License.
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// License text available at https://opensource.org/licenses/MIT
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'use strict';
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const DataSource = require('../../loopback-datasource-juggler').DataSource;
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const ModelBuilder = require('../../loopback-datasource-juggler').ModelBuilder;
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const ds = new DataSource('memory');
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// define models
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const Post = ds.define('Post', {
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title: {type: String, length: 255},
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content: {type: DataSource.Text},
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date: {type: Date, default: function() {
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return new Date;
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}},
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timestamp: {type: Number, default: Date.now},
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published: {type: Boolean, default: false, index: true},
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});
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// simplier way to describe model
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const User = ds.define('User', {
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name: String,
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bio: DataSource.Text,
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approved: Boolean,
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joinedAt: Date,
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age: Number,
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});
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const Group = ds.define('Group', {name: String});
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// define any custom method
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User.prototype.getNameAndAge = function() {
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return this.name + ', ' + this.age;
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};
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const user = new User({name: 'Joe'});
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console.log(user);
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// console.log(ds.models);
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// console.log(ds.definitions);
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// setup relationships
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User.hasMany(Post, {as: 'posts', foreignKey: 'userId'});
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// creates instance methods:
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// user.posts(conds)
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// user.posts.build(data) // like new Post({userId: user.id});
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// user.posts.create(data) // build and save
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Post.belongsTo(User, {as: 'author', foreignKey: 'userId'});
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// creates instance methods:
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// post.author(callback) -- getter when called with function
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// post.author() -- sync getter when called without params
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// post.author(user) -- setter when called with object
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User.hasAndBelongsToMany('groups');
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const user2 = new User({name: 'Smith', age: 14});
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user2.save(function(err) {
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console.log(user2);
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const post = user2.posts.build({title: 'Hello world'});
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post.save(function(err, data) {
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console.log(err ? err : data);
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});
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});
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Post.findOne({where: {published: false}, order: 'date DESC'}, function(err, data) {
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console.log(data);
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});
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User.create({name: 'Jeff', age: 12}, function(err, data) {
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if (err) {
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console.log(err);
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return;
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}
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console.log(data);
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const post = data.posts.build({title: 'My Post'});
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console.log(post);
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});
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User.create({name: 'Ray'}, function(err, data) {
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console.log(data);
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});
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User.scope('minors', {where: {age: {lte: 16}}, include: 'posts'});
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User.minors(function(err, kids) {
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console.log('Kids: ', kids);
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});
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const Article = ds.define('Article', {title: String});
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const Tag = ds.define('Tag', {name: String});
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Article.hasAndBelongsToMany('tags');
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Article.create(function(e, article) {
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article.tags.create({name: 'popular'}, function(err, data) {
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Article.findOne(function(e, article) {
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article.tags(function(e, tags) {
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console.log(tags);
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});
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});
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});
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});
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// should be able to attach a data source to an existing model
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const modelBuilder = new ModelBuilder();
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const Color = modelBuilder.define('Color', {
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name: String,
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});
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// attach
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ds.attach(Color);
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Color.create({name: 'red'});
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Color.create({name: 'green'});
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Color.create({name: 'blue'});
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Color.all(function(err, colors) {
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console.log(colors);
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});
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