1 files changed, 8 insertions, 2 deletions
diff --git a/activerecord/lib/active_record/attribute_methods.rb b/activerecord/lib/active_record/attribute_methods.rb
index 8bd51dc71f..a0a0214eae 100644
--- a/activerecord/lib/active_record/attribute_methods.rb
+++ b/activerecord/lib/active_record/attribute_methods.rb
@@ -48,7 +48,11 @@ module ActiveRecord
       end
 
       private
-      def method_body; raise NotImplementedError; end
+
+      # Override this method in the subclasses for method body.
+      def method_body(method_name, const_name)
+        raise NotImplementedError, "Subclasses must implement a method_body(method_name, const_name) method."
+      end
     end
 
     module ClassMethods
@@ -66,6 +70,7 @@ module ActiveRecord
       # Generates all the attribute related methods for columns in the database
       # accessors, mutators and query methods.
       def define_attribute_methods # :nodoc:
+        return false if @attribute_methods_generated
         # Use a mutex; we don't want two thread simultaneously trying to define
         # attribute methods.
         generated_attribute_methods.synchronize do
@@ -200,6 +205,7 @@ module ActiveRecord
           # this is probably horribly slow, but should only happen at most once for a given AR class
           attribute_method.bind(self).call(*args, &block)
         else
+          return super unless respond_to_missing?(method, true)
           send(method, *args, &block)
         end
       else
@@ -455,7 +461,7 @@ module ActiveRecord
     end
 
     def pk_attribute?(name)
-      column_for_attribute(name).primary
+      name == self.class.primary_key
     end
 
     def typecasted_attribute_value(name)