1 files changed, 18 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/attribute.rb b/activerecord/lib/active_record/attribute.rb
index 8cc1904575..88536eaac0 100644
--- a/activerecord/lib/active_record/attribute.rb
+++ b/activerecord/lib/active_record/attribute.rb
@@ -9,6 +9,10 @@ module ActiveRecord
         FromUser.new(name, value, type)
       end
 
+      def with_cast_value(name, value, type)
+        WithCastValue.new(name, value, type)
+      end
+
       def null(name)
         Null.new(name)
       end
@@ -58,6 +62,10 @@ module ActiveRecord
       self.class.from_database(name, value, type)
     end
 
+    def with_cast_value(value)
+      self.class.with_cast_value(name, value, type)
+    end
+
     def type_cast(*)
       raise NotImplementedError
     end
@@ -93,6 +101,16 @@ module ActiveRecord
       end
     end
 
+    class WithCastValue < Attribute # :nodoc:
+      def type_cast(value)
+        value
+      end
+
+      def changed_in_place_from?(old_value)
+        false
+      end
+    end
+
     class Null < Attribute # :nodoc:
       def initialize(name)
         super(name, nil, Type::Value.new)