Merge pull request #2465 from Shopify/0-9-stable-frozen-string-literal

Make the gem compatible with `--enable-frozen-string-literal`

Author: byroot

lib/action_controller/serialization.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'active_support/core_ext/class/attribute'
 
 module ActionController

lib/action_controller/serialization_test_case.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module ActionController
   module SerializationAssertions
     extend ActiveSupport::Concern

lib/active_model/array_serializer.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'active_model/default_serializer'
 require 'active_model/serializable'
 

lib/active_model/default_serializer.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'active_model/serializable'
 
 module ActiveModel

lib/active_model/serializable.rb

@@ -1,8 +1,10 @@
+# frozen_string_literal: true
+
 require 'active_model/serializable/utils'
 
 module ActiveModel
   module Serializable
-    INSTRUMENTATION_KEY = '!serialize.active_model_serializers'.freeze
+    INSTRUMENTATION_KEY = '!serialize.active_model_serializers'
 
     def self.included(base)
       base.extend Utils

lib/active_model/serializable/utils.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module ActiveModel
   module Serializable
     module Utils

lib/active_model/serializer.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'active_model/array_serializer'
 require 'active_model/serializable'
 require 'active_model/serializer/association'
@@ -130,14 +132,13 @@ def build_serializer_class_list(resource, options)
       end
 
       def build_serializer_class(resource, options)
-        "".tap do |klass_name|
-          klass_name << "#{options[:namespace]}::" if options[:namespace]
-          klass_name << options[:prefix].to_s.classify if options[:prefix]
-          if resource.is_a?(String)
-            klass_name << "#{resource}Serializer"
-          else
-            klass_name << "#{resource.class.name}Serializer"
-          end
+        klass_name = +""
+        klass_name << "#{options[:namespace]}::" if options[:namespace]
+        klass_name << options[:prefix].to_s.classify if options[:prefix]
+        if resource.is_a?(String)
+          klass_name << "#{resource}Serializer"
+        else
+          klass_name << "#{resource.class.name}Serializer"
         end
       end
 

lib/active_model/serializer/association.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'active_model/default_serializer'
 require 'active_model/serializer/association/has_one'
 require 'active_model/serializer/association/has_many'

lib/active_model/serializer/association/has_many.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module ActiveModel
   class Serializer
     class Association

lib/active_model/serializer/association/has_one.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module ActiveModel
   class Serializer
     class Association