mixins.test.js
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// Copyright IBM Corp. 2014,2016. All Rights Reserved.
// Node module: loopback-datasource-juggler
// This file is licensed under the MIT License.
// License text available at https://opensource.org/licenses/MIT
'use strict';
// This test written in mocha+should.js
var should = require('./init.js');
var jdb = require('../');
var ModelBuilder = jdb.ModelBuilder;
var DataSource = jdb.DataSource;
var Memory = require('../lib/connectors/memory');
var modelBuilder = new ModelBuilder();
var mixins = modelBuilder.mixins;
function timestamps(Model, options) {
Model.defineProperty('createdAt', {type: Date});
Model.defineProperty('updatedAt', {type: Date});
var originalBeforeSave = Model.beforeSave;
Model.beforeSave = function(next, data) {
Model.applyTimestamps(data, this.isNewRecord());
if (data.createdAt) {
this.createdAt = data.createdAt;
}
if (data.updatedAt) {
this.updatedAt = data.updatedAt;
}
if (originalBeforeSave) {
originalBeforeSave.apply(this, arguments);
} else {
next();
}
};
Model.applyTimestamps = function(data, creation) {
data.updatedAt = new Date();
if (creation) {
data.createdAt = data.updatedAt;
}
};
}
mixins.define('TimeStamp', timestamps);
describe('Model class', function() {
it('should define mixins', function() {
mixins.define('Example', function(Model, options) {
Model.prototype.example = function() {
return options;
};
});
mixins.define('Demo', function(Model, options) {
Model.demoMixin = options.value;
});
mixins.define('Multi', function(Model, options) {
Model.multiMixin = Model.multiMixin || {};
Model.multiMixin[options.key] = options.value;
});
});
it('should apply a mixin class', function() {
var Address = modelBuilder.define('Address', {
street: {type: 'string', required: true},
city: {type: 'string', required: true},
});
var memory = new DataSource('mem', {connector: Memory}, modelBuilder);
var Item = memory.createModel('Item', {name: 'string'}, {
mixins: {Address: true},
});
var properties = Item.definition.properties;
properties.street.should.eql({type: String, required: true});
properties.city.should.eql({type: String, required: true});
});
it('should apply mixins', function(done) {
var memory = new DataSource('mem', {connector: Memory}, modelBuilder);
var Item = memory.createModel('Item', {name: 'string'}, {
mixins: {
TimeStamp: true, Demo: {value: true},
Multi: [
{key: 'foo', value: 'bar'},
{key: 'fox', value: 'baz'},
],
},
});
Item.mixin('Example', {foo: 'bar'});
Item.demoMixin.should.be.true;
Item.multiMixin.foo.should.equal('bar');
Item.multiMixin.fox.should.equal('baz');
var properties = Item.definition.properties;
properties.createdAt.should.eql({type: Date});
properties.updatedAt.should.eql({type: Date});
Item.create({name: 'Item 1'}, function(err, inst) {
inst.createdAt.should.be.a.date;
inst.updatedAt.should.be.a.date;
inst.example().should.eql({foo: 'bar'});
done();
});
});
describe('#mixin()', function() {
var Person, Author, Address;
beforeEach(function() {
Address = modelBuilder.define('Address', {
street: {type: 'string', required: true},
city: {type: 'string', required: true},
});
var memory = new DataSource('mem', {connector: Memory}, modelBuilder);
Person = memory.createModel('Person', {name: 'string'});
Author = memory.createModel('Author', {name: 'string'});
});
it('should register mixin class into _mixins', function() {
Person.mixin(Address);
Person._mixins.should.containEql(Address);
});
it('should NOT share mixins registry', function() {
Person.mixin(Address);
Author._mixins.should.not.containEql(Address);
});
it('should able to mixin same class', function() {
Person.mixin(Address);
Author.mixin(Address);
Author._mixins.should.containEql(Address);
});
});
});