1 files changed, 36 insertions, 0 deletions
diff --git a/activemodel/lib/active_model/type/string.rb b/activemodel/lib/active_model/type/string.rb
new file mode 100644
index 0000000000..fd1630c751
--- /dev/null
+++ b/activemodel/lib/active_model/type/string.rb
@@ -0,0 +1,36 @@
+module ActiveModel
+  module Type
+    class String < Value # :nodoc:
+      def type
+        :string
+      end
+
+      def changed_in_place?(raw_old_value, new_value)
+        if new_value.is_a?(::String)
+          raw_old_value != new_value
+        end
+      end
+
+      def serialize(value)
+        case value
+        when ::Numeric, ActiveSupport::Duration then value.to_s
+        when ::String then ::String.new(value)
+        when true then "t"
+        when false then "f"
+        else super
+        end
+      end
+
+      private
+
+      def cast_value(value)
+        case value
+        when true then "t"
+        when false then "f"
+        # String.new is slightly faster than dup
+        else ::String.new(value.to_s)
+        end
+      end
+    end
+  end
+end