Change model validation error message

25 November 2015

http://guides.rubyonrails.org/i18n.html#translations-for-active-record-models

app/models/user.rb

# ...
validates_format_of :password, :with => PASSWORD_FORMAT,
# ...

config/locales/en.yml

en:
  activerecord:
    errors:
      models:
        user:
          attributes:
            password:
              invalid: 'Must include uppercase & number'
  • for validates_presence_of keyword you can use blank
  • for validates_length_of keyword you can use too_short or too_long
  • for validates_uniqueness_of keyword you can use taken