fix(serializer): support reflexive relationships

test/reflexiveRelationship.test.js

@@ -0,0 +1,63 @@
+/* global describe, beforeEach, it */
+
+var request = require('supertest')
+var loopback = require('loopback')
+var expect = require('chai').expect
+var JSONAPIComponent = require('../')
+var RSVP = require('rsvp')
+
+var app, Folder;
+
+describe('reflexive relationship', function () {
+  beforeEach(function (done) {
+    app = loopback()
+    app.set('legacyExplorer', false)
+    var ds = loopback.createDataSource('memory')
+    // create models
+    Folder = ds.createModel('folder', {
+      id: { type: Number, id: true },
+      name: String
+    })
+
+    Folder.hasMany(Folder, { as: 'children', foreignKey: 'parentId' })
+    Folder.belongsTo(Folder, { as: 'parent', foreignKey: 'parentId' })
+    // add models
+    app.model(Folder)
+
+    // make data
+    Folder.create(
+      [
+        { name: 'Folder 1', parentId: 0 },
+        { name: 'Folder 2', parentId: 1 },
+        { name: 'Folder 3', parentId: 1 },
+        { name: 'Folder 4', parentId: 3 }
+      ],
+      function (err, foders) {
+        if (err) console.error(err)
+        done()
+      }
+    )
+
+    app.use(loopback.rest())
+    JSONAPIComponent(app, { restApiRoot: '' })
+  })
+
+
+  it('should make initial data', function (done) {
+    request(app).get('/folders').end(function (err, res) {
+      expect(err).to.equal(null)
+      expect(res.body.data.length).to.equal(4)
+      done(err)
+    })
+  })
+
+  it('should have children', function (done) {
+    request(app).get('/folders/1/children').end(function (err, res) {
+      expect(err).to.equal(null)
+      expect(res.body.data.length).to.equal(2)
+      expect(res.body.data[0].relationships.children.data).to.equal(null)
+      expect(res.body.data[1].relationships.children.data).to.be.an('array')
+      done(err)
+    })
+  })
+})