Merge pull request #617 from konukhov/namespaced_serializers-0-9

Namespaced serializers #499

lib/active_model/array_serializer.rb

@@ -22,6 +22,7 @@ module ActiveModel
       @resource_name   = options[:resource_name]
       @only            = options[:only] ? Array(options[:only]) : nil
       @except          = options[:except] ? Array(options[:except]) : nil
+      @namespace       = options[:namespace]
       @key_format      = options[:key_format] || options[:each_serializer].try(:key_format)
     end
     attr_accessor :object, :scope, :root, :meta_key, :meta, :key_format
@@ -33,13 +34,13 @@ module ActiveModel
     end
 
     def serializer_for(item)
-      serializer_class = @each_serializer || Serializer.serializer_for(item) || DefaultSerializer
+      serializer_class = @each_serializer || Serializer.serializer_for(item, namespace: @namespace) || DefaultSerializer
       serializer_class.new(item, scope: scope, key_format: key_format, only: @only, except: @except, polymorphic: @polymorphic)
     end
 
     def serializable_object
       @object.map do |item|
-        serializer_for(item).serializable_object
+        serializer_for(item).serializable_object_with_notification
       end
     end
     alias_method :serializable_array, :serializable_object
@@ -59,6 +60,7 @@ module ActiveModel
     end
 
     private
+
     def instrumentation_keys
       [:object, :scope, :root, :meta_key, :meta, :each_serializer, :resource_name, :key_format]
     end

lib/active_model/serializable.rb

@@ -1,5 +1,11 @@
+require 'active_model/serializable/utils'
+
 module ActiveModel
   module Serializable
+    def self.included(base)
+      base.extend Utils
+    end
+
     def as_json(options={})
       instrument('!serialize') do
         if root = options.fetch(:root, json_key)
@@ -12,6 +18,12 @@ module ActiveModel
       end
     end
 
+    def serializable_object_with_notification
+      instrument('!serialize') do
+        serializable_object
+      end
+    end
+
     def serializable_data
       embedded_in_root_associations.tap do |hash|
         if respond_to?(:meta) && meta
@@ -20,11 +32,21 @@ module ActiveModel
       end
     end
 
+    def namespace
+      get_namespace && Utils._const_get(get_namespace)
+    end
+
     def embedded_in_root_associations
       {}
     end
 
     private
+
+    def get_namespace
+      modules = self.class.name.split('::')
+      modules[0..-2].join('::') if modules.size > 1
+    end
+
     def instrument(action, &block)
       payload = instrumentation_keys.inject({ serializer: self.class.name }) do |payload, key|
         payload[:payload] = self.instance_variable_get(:"@#{key}")

lib/active_model/serializable/utils.rb

@@ -0,0 +1,12 @@
+module ActiveModel
+  module Serializable
+    module Utils
+      extend self
+
+      def _const_get(const)
+        method = RUBY_VERSION >= '2.0' ? :const_get : :qualified_const_get
+        Object.send method, const
+      end
+    end
+  end
+end

lib/active_model/serializer.rb

@@ -55,32 +55,18 @@ end
       end
       attr_reader :key_format
 
-      if RUBY_VERSION >= '2.0'
-        def serializer_for(resource)
-          if resource.respond_to?(:to_ary)
-            if Object.constants.include?(:ArraySerializer)
-              ::ArraySerializer
-            else
-              ArraySerializer
-            end
+      def serializer_for(resource, options = {})
+        if resource.respond_to?(:to_ary)
+          if Object.constants.include?(:ArraySerializer)
+            ::ArraySerializer
           else
-            begin
-              Object.const_get "#{resource.class.name}Serializer"
-            rescue NameError
-              nil
-            end
+            ArraySerializer
           end
-        end
-      else
-        def serializer_for(resource)
-          if resource.respond_to?(:to_ary)
-            if Object.constants.include?(:ArraySerializer)
-              ::ArraySerializer
-            else
-              ArraySerializer
-            end
-          else
-            "#{resource.class.name}Serializer".safe_constantize
+        else
+          begin
+            _const_get build_serializer_class(resource, options)
+          rescue NameError
+            nil
           end
         end
       end
@@ -113,6 +99,14 @@ end
 
       private
 
+      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]
+          klass_name << "#{resource.class.name}Serializer"
+        end
+      end
+
       def associate(klass, *attrs)
         options = attrs.extract_options!
 
@@ -219,7 +213,16 @@ end
 
     def build_serializer(association)
       object = send(association.name)
-      association.build_serializer(object, scope: scope)
+      association.build_serializer(object, association_options_for_serializer(association))
+    end
+
+    def association_options_for_serializer(association)
+      prefix = association.options[:prefix]
+
+      { scope: scope }.tap do |opts|
+        opts[:namespace] = namespace if namespace
+        opts[:prefix]    = prefix    if prefix
+      end
     end
 
     def serialize(association)

lib/active_model/serializer/association.rb

@@ -42,8 +42,8 @@ module ActiveModel
         @embed_objects = embed == :object || embed == :objects
       end
 
-      def serializer_from_object(object)
-        Serializer.serializer_for(object)
+      def serializer_from_object(object, options = {})
+        Serializer.serializer_for(object, options)
       end
 
       def default_serializer
@@ -51,7 +51,7 @@ module ActiveModel
       end
 
       def build_serializer(object, options = {})
-        serializer_class(object).new(object, options.merge(self.options))
+        serializer_class(object, options).new(object, options.merge(self.options))
       end
     end
   end

lib/active_model/serializer/association/has_many.rb

@@ -8,7 +8,7 @@ module ActiveModel
           @key ||= "#{name.to_s.singularize}_ids"
         end
 
-        def serializer_class(object)
+        def serializer_class(object, _)
           if use_array_serializer?
             ArraySerializer
           else

lib/active_model/serializer/association/has_one.rb

@@ -8,8 +8,8 @@ module ActiveModel
           @key ||= "#{name}_id"
         end
 
-        def serializer_class(object)
-          serializer_from_options || serializer_from_object(object) || default_serializer
+        def serializer_class(object, options = {})
+          serializer_from_options || serializer_from_object(object, options) || default_serializer
         end
 
         def build_serializer(object, options = {})