Feature backported from Rails 5.0 to use with Rails 3.2.x and 4.x apps.
Background: rails/rails#18322
gem install "active_model-errors_details"
To check what validator type was used on invalid attribute, you can use errors.details[:attribute]. It returns array of hashes where under :error key you will find symbol of used validator.
class Person < ActiveRecord::Base
validates :name, presence: true
end
person = Person.new
person.valid?
person.errors.details[:name]
# => [{error: :blank}]You can add validator type to details hash when using ActiveModel::Errors.add method.
class User < ActiveRecord::Base
validate :adulthood
def adulthood
errors.add(:age, :too_young) if age < 18
end
end
user = User.new(age: 15)
user.valid?
user.errors.details
# => {age: [{error: :too_young}]}To improve error details to contain additional options, you can pass them to ActiveModel::Errors.add method.
class User < ActiveRecord::Base
validate :adulthood
def adulthood
errors.add(:age, :too_young, years_limit: 18) if age < 18
end
end
user = User.new(age: 15)
user.valid?
user.errors.details
# => {age: [{error: :too_young, years_limit: 18}]}All built in Rails validators populate details hash with corresponding validator types.