How to change validation messages?

[Anton Kuzmin]

For example, I need to change "can't be blank" message.

Devise's Validatable module ads this to the model:

validates_presence_of   :email, if: :email_required?

What I actually need to do:

validates :email, presence: { message: lambda { |error, attributes| I18n.t('forms.cannot_be_blank.fem') }}

[Lucas Mazza]

You can use I18n for that, just scope the translation for the proper model + attribute http://guides.rubyonrails.org/i18n.html#translations-for-active-record-models

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[Anton Kuzmin]

Yes, but the problem is to override the validation that devise provided. When I just add another "validates" call to my user model, I get 2 messages about blank email.

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[Lucas Mazza]

If you are rolling your own validations then you shouldn't use the validatable module. If all you want is to simply translate the messages, without changing any of the existing behaviour of the validations, you can change the messages through i18n. But if your models require a more complex validation scheme then it's recommended to remove the validatable module and roll your own validations.

[Anton Kuzmin]

Thank you, Lucas.

I think I need to roll my own Validatable module because different fields need different "can't be blank" messages depending on grammar rules of the target language.