Merge branch 'master' into nested_has_many_through_2

2 files changed, 7 insertions, 3 deletions

diff --git a/activemodel/lib/active_model/naming.rb b/activemodel/lib/active_model/naming.rb
index fc2abacb6d..2d580fd325 100644
--- a/activemodel/lib/active_model/naming.rb
+++ b/activemodel/lib/active_model/naming.rb
@@ -73,8 +73,10 @@ module ActiveModel
     # Returns an ActiveModel::Name object for module. It can be
     # used to retrieve all kinds of naming-related information.
     def model_name
-      namespace = self.parents.detect { |n| n.respond_to?(:_railtie) }
-      @_model_name ||= ActiveModel::Name.new(self, namespace)
+      @_model_name ||= begin
+        namespace = self.parents.detect { |n| n.respond_to?(:_railtie) }
+        ActiveModel::Name.new(self, namespace)
+      end
     end
 
     # Returns the plural class name of a record or class. Examples:
diff --git a/activemodel/lib/active_model/validations/confirmation.rb b/activemodel/lib/active_model/validations/confirmation.rb
index 2c8a840124..00df10cef0 100644
--- a/activemodel/lib/active_model/validations/confirmation.rb
+++ b/activemodel/lib/active_model/validations/confirmation.rb
@@ -10,7 +10,9 @@ module ActiveModel
       end
 
       def setup(klass)
-        klass.send(:attr_accessor, *attributes.map { |attribute| :"#{attribute}_confirmation" })
+        klass.send(:attr_accessor, *attributes.map do |attribute|
+          :"#{attribute}_confirmation" unless klass.method_defined?(:"#{attribute}_confirmation")
+        end.compact)
       end
     end