Add symbol support for ActiveModel::Serializer.type method

The ActiveModel::Serializer.type method now accepts symbol as paremeter:
class AuthorSerializer < ActiveModel::Serializer
  type :profile
end
The test file for the type was also refactored.

test/adapter/json_api/resource_type_config_test.rb

@@ -1,71 +0,0 @@
-require 'test_helper'
-
-module ActiveModel
-  class Serializer
-    module Adapter
-      class JsonApi
-        class ResourceTypeConfigTest < ActiveSupport::TestCase
-          class ProfileTypeSerializer < ActiveModel::Serializer
-            attributes :name
-            type 'profile'
-          end
-
-          def setup
-            @author = Author.new(id: 1, name: 'Steve K.')
-            @author.bio = nil
-            @author.roles = []
-            @blog = Blog.new(id: 23, name: 'AMS Blog')
-            @post = Post.new(id: 42, title: 'New Post', body: 'Body')
-            @anonymous_post = Post.new(id: 43, title: 'Hello!!', body: 'Hello, world!!')
-            @comment = Comment.new(id: 1, body: 'ZOMG A COMMENT')
-            @post.comments = [@comment]
-            @post.blog = @blog
-            @anonymous_post.comments = []
-            @anonymous_post.blog = nil
-            @comment.post = @post
-            @comment.author = nil
-            @post.author = @author
-            @anonymous_post.author = nil
-            @blog = Blog.new(id: 1, name: 'My Blog!!')
-            @blog.writer = @author
-            @blog.articles = [@post, @anonymous_post]
-            @author.posts = []
-          end
-
-          def with_jsonapi_resource_type type
-            old_type = ActiveModelSerializers.config.jsonapi_resource_type
-            ActiveModelSerializers.config.jsonapi_resource_type = type
-            yield
-          ensure
-            ActiveModelSerializers.config.jsonapi_resource_type = old_type
-          end
-
-          def test_config_plural
-            with_jsonapi_resource_type :plural do
-              hash = serializable(@comment, adapter: :json_api).serializable_hash
-              assert_equal('comments', hash[:data][:type])
-            end
-          end
-
-          def test_config_singular
-            with_jsonapi_resource_type :singular do
-              hash = serializable(@comment, adapter: :json_api).serializable_hash
-              assert_equal('comment', hash[:data][:type])
-            end
-          end
-
-          def test_explicit_type_value
-            hash = serializable(@author, serializer: ProfileTypeSerializer, adapter: :json_api).serializable_hash
-            assert_equal('profile', hash.fetch(:data).fetch(:type))
-          end
-
-          private
-
-          def serializable(resource, options = {})
-            ActiveModel::SerializableResource.new(resource, options)
-          end
-        end
-      end
-    end
-  end
-end

test/adapter/json_api/type_test.rb

@@ -0,0 +1,61 @@
+require 'test_helper'
+
+module ActiveModel
+  class Serializer
+    module Adapter
+      class JsonApi
+        class TypeTest < ActiveSupport::TestCase
+          class StringTypeSerializer < ActiveModel::Serializer
+            attribute :name
+            type 'profile'
+          end
+
+          class SymbolTypeSerializer < ActiveModel::Serializer
+            attribute :name
+            type :profile
+          end
+
+          setup do
+            @author = Author.new(id: 1, name: 'Steve K.')
+          end
+
+          def test_config_plural
+            with_jsonapi_resource_type :plural do
+              assert_type(@author, 'authors')
+            end
+          end
+
+          def test_config_singular
+            with_jsonapi_resource_type :singular do
+              assert_type(@author, 'author')
+            end
+          end
+
+          def test_explicit_string_type_value
+            assert_type(@author, 'profile', serializer: StringTypeSerializer)
+          end
+
+          def test_explicit_symbol_type_value
+            assert_type(@author, 'profile', serializer: SymbolTypeSerializer)
+          end
+
+          private
+
+          def assert_type(resource, expected_type, opts = {})
+            opts = opts.reverse_merge(adapter: :json_api)
+            hash = serializable(resource, opts).serializable_hash
+            assert_equal(expected_type, hash.fetch(:data).fetch(:type))
+          end
+
+          def with_jsonapi_resource_type inflection
+            old_inflection = ActiveModelSerializers.config.jsonapi_resource_type
+            ActiveModelSerializers.config.jsonapi_resource_type = inflection
+            yield
+          ensure
+            ActiveModelSerializers.config.jsonapi_resource_type = old_inflection
+          end
+        end
+      end
+    end
+  end
+end