1 files changed, 14 insertions, 1 deletions
diff --git a/activemodel/lib/active_model/errors.rb b/activemodel/lib/active_model/errors.rb
index 3d814b4870..80621cd7da 100644
--- a/activemodel/lib/active_model/errors.rb
+++ b/activemodel/lib/active_model/errors.rb
@@ -79,6 +79,19 @@ module ActiveModel
       @messages = ActiveSupport::OrderedHash.new
     end
 
+    def initialize_dup(other)
+      @messages = other.messages.dup
+    end
+
+    # Backport dup from 1.9 so that #initialize_dup gets called
+    unless Object.respond_to?(:initialize_dup)
+      def dup # :nodoc:
+        copy = super
+        copy.initialize_dup(self)
+        copy
+      end
+    end
+
     # Clear the messages
     def clear
       messages.clear
@@ -119,7 +132,7 @@ module ActiveModel
     #   p.errors[:name] = "must be set"
     #   p.errors[:name] # => ['must be set']
     def []=(attribute, error)
-      self[attribute.to_sym] << error
+      self[attribute] << error
     end
 
     # Iterates through each error key, value pair in the error messages hash.