DZone Snippets is a public source code repository. Easily build up your personal collection of code snippets, categorize them with tags / keywords, and share them with the world

Mickael has posted 15 posts at DZone. View Full User Profile

Putting The Errors In The Right Place

  • submit to reddit
        The idea is to display the error near the field instead of in global area at the top of the page.
Simple… first go into your view and delete the
error_messages_for ‘object’

Then stick this in your application helper.

# application_helper.rb
def error_for(object, method = nil, options={})
  if method
    err = instance_variable_get("@#{object}").errors.on(method).to_sentence     rescue instance_variable_get("@#{object}").errors.on(method)
     err = @errors["#{object}"] rescue nil
:style=>(err ? #{options[:style]}":"#{options[:style]};display: none;")
 content_tag("p",err || "", options )     

Then in your form view, add an ‘error_for’ call wherever you need one…

# _form.rhtml
  <p><label for="code_project_name">Name</label>
  <%= text_field ‘code_project’, ‘name’  %>
  <%= error_for ‘code_project’, ‘name’ %></p>

If the model fails a validation test, then it will show the message right next to the field that caused the validation problem.
Also note that if you define an instance variable called @errors containing a hash of field_names and messages, they will also be used. This is handy for those form fields that don’t correspond to a model attribute.    


Snippets Manager replied on Fri, 2007/02/02 - 3:03pm

Hi Mickael, isn't that what the built-in error_message_on method is for? Maybe I'm missing something...

Snippets Manager replied on Tue, 2006/01/17 - 3:17pm

This works well for me: ActionView::Base.field_error_proc = do |html, instance| %{#{html} • #{[instance.error_message].flatten.first}} end