Validators message in rails 3

Question

In Rails 3, the validators is changed: now is possible to specify all the validators for a specific field in once:

so instead to write

Rails 2.x.x style
validates_size_of :username, :within => 5..15, :message=> "username size must be between 5 and 15"

now I can write

Rails 3 style

 validates :username,  :length => { :minimum => 5, :maximum => 40 }

But if I add :messge=> "bla bla bla" in this last example (Rails 3 style) an error occur, so the question is: How to edit personal error message to the model in order to show them in the view ?

Thank you

coreyward · Accepted Answer · 2011-01-15 19:13:25Z

1

When you use the shorthand validates :model method you can only add specific messages within the context of a specific validator. Example:

validates :username, :length => { :minimum => 5, :maximum => 40, :message => 'should be between 5 and 40 characters' }

Note that the message is in the hash for the :length key. Otherwise Rails doesn't know which validator the message should be applied to.

answered Jan 15, 2011 at 19:13

coreyward

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3 Comments

Joe Over a year ago

And what about the syntax errors.add ? How can I add a specific error from the model ? is it an equivalent tecnique with the one you cited ?

Joe Over a year ago

Can you give me a simple example to use errors.add instead that :message in your code ? Thank you very much

Peter Lyons Over a year ago

If you want to add a custom error message, you can still use :message but call a method to generate the error message instead of having a literal string. Otherwise you can code a totally custom set of validation logic including custom logic to generate your error message. This blog post has examples. thelucid.com/2010/01/08/sexy-validation-in-edge-rails-rails-3

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