Add support for JSON API deserialization (experimental).

test/action_controller/json_api/deserialization_test.rb

@@ -0,0 +1,59 @@
+require 'test_helper'
+
+module ActionController
+  module Serialization
+    class JsonApi
+      class DeserializationTest < ActionController::TestCase
+        class DeserializationTestController < ActionController::Base
+          def render_parsed_payload
+            parsed_hash = ActiveModelSerializers::Deserialization.jsonapi_parse(params)
+            render json: parsed_hash
+          end
+        end
+
+        tests DeserializationTestController
+
+        def test_deserialization
+          hash = {
+            'data' => {
+              'type' => 'photos',
+              'id' => 'zorglub',
+              'attributes' => {
+                'title' => 'Ember Hamster',
+                'src' => 'http://example.com/images/productivity.png'
+              },
+              'relationships' => {
+                'author' => {
+                  'data' => nil
+                },
+                'photographer' => {
+                  'data' => { 'type' => 'people', 'id' => '9' }
+                },
+                'comments' => {
+                  'data' => [
+                    { 'type' => 'comments', 'id' => '1' },
+                    { 'type' => 'comments', 'id' => '2' }
+                  ]
+                }
+              }
+            }
+          }
+
+          post :render_parsed_payload, hash
+
+          response = JSON.parse(@response.body)
+          expected = {
+            'id' => 'zorglub',
+            'title' => 'Ember Hamster',
+            'src' => 'http://example.com/images/productivity.png',
+            'author_id' => nil,
+            'photographer_id' => '9',
+            'comment_ids' => %w(1 2)
+          }
+
+          assert_equal(expected, response)
+        end
+      end
+    end
+  end
+end