Extract delegatable

lib/ams/delegatable.rb

@@ -0,0 +1,37 @@
+module AMS
+  module Delegatable
+    # delegate constant lookup to Object
+    def const_missing(name)
+      ::Object.const_get(name)
+    end
+
+    def self.extended(base)
+      base.class_eval do
+        # @!visibility private
+        def send(*args)
+          __send__(*args)
+        end
+
+        private
+
+        def method_missing(name, *args, &block)
+          object.send(name, *args, &block)
+        end
+
+        def respond_to_missing?(name, include_private = false)
+          object.respond_to?(name, include_private)
+        end
+
+        const_set(:KERNEL_METHOD_METHOD, ::Kernel.instance_method(:method))
+        def method_handle_for(method_name)
+          KERNEL_METHOD_METHOD.bind(self).call(method_name)
+        rescue NameError => original
+          handle = self.method(method_name)
+          raise original unless handle.is_a? Method
+          handle
+        end
+        alias method method_handle_for
+      end
+    end
+  end
+end

lib/ams/serializer.rb

@@ -3,6 +3,7 @@
 require "json"
 require "ams/inflector"
 require "ams/dsl_support"
+require "ams/delegatable"
 module AMS
   # Lightweight mapping of a model to a JSON API resource object
   # with attributes and relationships
@@ -32,11 +33,8 @@ module AMS
   #  ums = UserModelSerializer.new(user)
   #  ums.to_json
   class Serializer < BasicObject
-    extend DSLSupport
-    # delegate constant lookup to Object
-    def self.const_missing(name)
-      ::Object.const_get(name)
-    end
+    extend ::AMS::DSLSupport
+    extend ::AMS::Delegatable
 
     class << self
       attr_accessor :_attributes, :_relations, :_id_field, :_type
@@ -422,16 +420,6 @@ module AMS
       JSON.dump(obj)
     end
 
-    # @!visibility private
-    def send(*args)
-      __send__(*args)
-    end
-
-    KERNEL_METHOD_METHOD = ::Kernel.instance_method(:method)
-    def method(method_name)
-      KERNEL_METHOD_METHOD.bind(self).call(method_name)
-    end
-
     private
 
       def link_builder?
@@ -467,9 +455,5 @@ module AMS
       def foreign_key
         "#{object.class.table_name.singularize}_id"
       end
-
-      def method_missing(name, *args, &block)
-        object.send(name, *args, &block)
-      end
   end
 end