Display link in Rails form error message

Question

On our sign-up form, we validates_uniqueness_of :email

When the a user is attempting to use our sign up form and they specify an existing email address, I\'

Answer 1

I know this is an old question, but for future users who want to insert a link into an error message, here are some guidelines that worked for me.

First, the I18n error messages are assumed html safe already, so you can go ahead and write a suitable error message. In this example, I'm changing an "email is taken" message.

# config/locales/en.yml
activerecord:
  errors:
    models:
      user:
        attributes:
          email:
            taken: 'has already been taken. If this is your email address, try logging in instead.'

Notice the interpolated variable %link.

Now all you need to is pass in a value for that variable in your validator, like so:

# app/models/user.rb
validates :email, :uniqueness => {:link => Rails.application.routes.url_helpers.login_path}

(By default, any options you pass in here will automatically be sent over to the I18n translator as variables, including some special pre-populated variables like %value, %model, etc.)

That's it! You now have a link in your error message.