require 'active_support/core_ext/object/blank'
module ActiveModel
# == Active Model Presence Validator
module Validations
class PresenceValidator < EachValidator
def validate_each(record, attr_name, value)
record.errors.add(attr_name, :blank, options) if value.blank?
end
end
module HelperMethods
# Validates that the specified attributes are not blank (as defined by
# Object#blank?). Happens by default on save. Example:
#
# class Person < ActiveRecord::Base
# validates_presence_of :first_name
# end
#
# The first_name attribute must be in the object and it cannot be blank.
#
# If you want to validate the presence of a boolean field (where the real values
# are true and false), you will want to use validates_inclusion_of :field_name,
# :in => [true, false].
#
# This is due to the way Object#blank? handles boolean values:
# false.blank? # => true.
#
# Configuration options:
# * :message - A custom error message (default is: "can't be blank").
# * :on - Specifies when this validation is active. Runs in all
# validation contexts by default (+nil+), other options are :create
# and :update.
# * :if - Specifies a method, proc or string to call to determine if
# the validation should occur (e.g. :if => :allow_validation, or
# :if => Proc.new { |user| user.signup_step > 2 }). The method, proc
# or string should return or evaluate to a true or false value.
# * :unless - Specifies a method, proc or string to call to determine
# if the validation should not occur (e.g. :unless => :skip_validation,
# or :unless => Proc.new { |user| user.signup_step <= 2 }). The method,
# proc or string should return or evaluate to a true or false value.
# * :strict - Specifies whether validation should be strict.
# See ActiveModel::Validation#validates! for more information.
def validates_presence_of(*attr_names)
validates_with PresenceValidator, _merge_attributes(attr_names)
end
end
end
end