Adding Fragment Cache to AMS

It's an upgrade based on the new Cache implementation #693.
It allows to use the Rails conventions to cache
specific attributes or associations.
It's based on the Cache Composition implementation.

test/adapter/fragment_cache_test.rb

@@ -0,0 +1,27 @@
+require 'test_helper'
+module ActiveModel
+  class Serializer
+    class Adapter
+      class FragmentCacheTest < Minitest::Test
+        def setup
+          @author          = Author.new(name: 'Joao M. D. Moura')
+          @role            = Role.new(name: 'Great Author', description:nil)
+          @role.author     = [@author]
+          @role_serializer = RoleSerializer.new(@role)
+          @role_hash       = FragmentCache.new(RoleSerializer.adapter.new(@role_serializer), @role_serializer, {}, nil)
+        end
+
+        def test_fragment_fetch_with_virtual_attributes
+          expected_result = {
+            id: @role.id,
+            description: @role.description,
+            slug: "#{@role.name}-#{@role.id}",
+            name: @role.name
+          }
+          assert_equal(@role_hash.fetch, expected_result)
+        end
+      end
+    end
+  end
+end
+

test/adapter/json/has_many_test.rb

@@ -6,6 +6,7 @@ module ActiveModel
       class Json
         class HasManyTestTest < Minitest::Test
           def setup
+            ActionController::Base.cache_store.clear
             @author = Author.new(id: 1, name: 'Steve K.')
             @post = Post.new(title: 'New Post', body: 'Body')
             @first_comment = Comment.new(id: 1, body: 'ZOMG A COMMENT')

test/adapter/json_api/has_one_test.rb

@@ -41,6 +41,7 @@ module ActiveModel
             expected = [
               {
                 id: "43",
+                rating: nil,
                 type: "bios",
                 content:"AMS Contributor",
                 links: {

test/adapter/json_api/linked_test.rb

@@ -1,11 +1,11 @@
 require 'test_helper'
-
 module ActiveModel
   class Serializer
     class Adapter
       class JsonApi
         class LinkedTest < Minitest::Test
           def setup
+            ActionController::Base.cache_store.clear
             @author1 = Author.new(id: 1, name: 'Steve K.')
             @author2 = Author.new(id: 2, name: 'Tenderlove')
             @bio1 = Bio.new(id: 1, content: 'AMS Contributor')
@@ -103,8 +103,9 @@ module ActiveModel
                   }
                 }, {
                   id: "1",
-                  content: "AMS Contributor",
+                  rating: nil,
                   type: "bios",
+                  content: "AMS Contributor",
                   links: {
                     author: { linkage: { type: "authors", id: "1" } }
                   }
@@ -119,8 +120,9 @@ module ActiveModel
                   }
                 }, {
                   id: "2",
-                  content: "Rails Contributor",
+                  rating: nil,
                   type: "bios",
+                  content: "Rails Contributor",
                   links: {
                     author: { linkage: { type: "authors", id: "2" } }
                   }

test/adapter/json_test.rb

@@ -5,6 +5,7 @@ module ActiveModel
     class Adapter
       class JsonTest < Minitest::Test
         def setup
+          ActionController::Base.cache_store.clear
           @author = Author.new(id: 1, name: 'Steve K.')
           @post = Post.new(title: 'New Post', body: 'Body')
           @first_comment = Comment.new(id: 1, body: 'ZOMG A COMMENT')