Hi
I've got a model which validates_presence_of a field (its a comment form) and the new comment is added to the top of the comment listing with a blind_down effect.
However, regardless of whether the field has been entered it still executes the RJS template. Is there some Ajax-level validation I can use thats catered for in Rails?
If someone could point me in the direction of a tutorial, method or anything of help I'd be very grateful.
Cheers.
Doug
I've got a model which validates_presence_of a field
However, regardless of whether the field has been entered it still executes the RJS template.
Of course it does. Barring an error in the app, Rails will _always_ generate a response to a browser request. In the case of non-RJS requests, Rails validations populate the @error_messages hash which then gets rendered via a <%= @error_messages_for @object %> directive in your rhtml view. For RJS requests, the model still populates the @error_messages hash. Problem is, when you're using RJS you're not going to render that view. The easiest way to handle your situation is to do the presence check in the controller and then 'feed' your RJS view, or call a different RJS view, depending on the result. If you want to send back an error message, use flash.now to avoid having the message hang around longer than one cycle. Might look something like...
def my_ajax_response if params[:thing_to_validate].empty? flash.now[:notice] => 'that field can't be empty' else object_to_save.field_name = params[:thing_to_validate] object_to_save.save end end
hth, Bill
Is there some Ajax-level validation I can
Oops. Depending on the specifics, you might need to use...
if params[:thing_to_validate].nil? ...
Sorry about that.
Bill