errors.full_messages: attribute name appears twice

This has been bugging me for a while. This problem occurs with all of my models, but i'll use one of them, Quiz, as an example.

Quiz has the following validations:

validates_presence_of :size, :style

I'm using I18n, and i have the following set in my translations file: (these are just the standard error messages, but i've included them in my en.yml so that it's easy to see the structure, if i want to override them for any particular model)

activerecord:
  errors:
    messages:
      inclusion: "{{attribute}} is not included in the list"
      invalid: "{{attribute}} is invalid"
      empty: "{{attribute}} can't b开发者_开发问答e empty"
      blank: "{{attribute}} can't be blank"
      record_invalid: "Validation failed: {{errors}}"   

The problem is this: if i make a new quiz, which will fail validation, then look at quiz.errors.full_messages, each error message has the attribute then the full message:

>> quiz = Quiz.create
=> <unsaved quiz object>
>> quiz.errors.full_messages
=> ["Size Size can't be blank", "Style Style can't be blank"]

I don't understand why the message is, for example, "Size Size can't be blank" and not "Size can't be blank"

Any ideas anyone?

There should be also:

en:
  errors:
    # The default format to use in full error messages.
    format: "%{attribute} %{message}"

And your other translations shouldn't include %{attribute} anymore. To make sure you get all correctly use en.yml from your Rails version, it is located at: lib/ruby/gems/1.8/gems/activemodel-3.0.3/lib/active_model/locale/en.yml

I just figured this out and thought i'd answer it myself in case anyone else had this problem: i had to amend the activerecord part of my translations file thus:

activerecord:
  errors:
    full_messages:
      format: "{{message}}"    
    #define standard error messages, which we can overide on per model/per attribute basis further down
    messages:
      inclusion: "{{attribute}} is not included in the list"
      exclusion: "{{attribute}} is reserved"

The problem was that the activerecord.errors.full_messages.format key was set (in vendor/rails/activerecord/lib/active_record/locale/en.yml) to "{{attribute}} {{message}}", and the messages in turn were set to "{{attribute}} can't be blank" for example. So the full_message was coming out as "{{attribute}} {{attribute}} can't be blank". Changing it to be just "{{message}}" fixed this.