Method: ActiveModel::Validations::ClassMethods#validators_on

Defined in:
lib/active_model/validations.rb

#validators_on(*attributes) ⇒ Object

List all validators that are being used to validate a specific attribute.

class Person
  include ActiveModel::Validations

  attr_accessor :name, :age

  validates_presence_of :name
  validates_inclusion_of :age, in: 0..99
end

Person.validators_on(:name)
# => [
#       #<ActiveModel::Validations::PresenceValidator:0x007fe604914e60 @attributes=[:name], @options={}>,
#    ]



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# File 'lib/active_model/validations.rb', line 254

def validators_on(*attributes)
  attributes.flat_map do |attribute|
    _validators[attribute.to_sym]
  end
end