record.coffee in unpoly-rails-0.60.0

- old
+ new

@@ -6,11 +6,17 @@
     throw 'Return an array of property names'
 
   constructor: (options) ->
     u.assign(this, @attributes(options))
 
-  attributes: (source = @) =>
+  attributes: (source = @) ->
     u.only(source, @fields()...)
 
-  copy: (changes = {}) =>
+  "#{u.copy.key}": ->
+    @variant()
+
+  variant: (changes = {}) ->
     attributesWithChanges = u.merge(@attributes(), changes)
     new @constructor(attributesWithChanges)
+
+  "#{u.isEqual.key}": (other) ->
+    other && (@constructor == other.constructor) && u.isEqual(@attributes(), other.attributes())