39 lines
1.4 KiB
Ruby
39 lines
1.4 KiB
Ruby
|
|
||
|
|
module ActiveModel
|
||
|
|
module Validations
|
||
|
|
class PresenceValidator < EachValidator # :nodoc:
|
||
|
|
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.
|
||
|
|
#
|
||
|
|
# 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
|
||
|
|
# <tt>validates_inclusion_of :field_name, in: [true, false]</tt>.
|
||
|
|
#
|
||
|
|
# This is due to the way Object#blank? handles boolean values:
|
||
|
|
# <tt>false.blank? # => true</tt>.
|
||
|
|
#
|
||
|
|
# Configuration options:
|
||
|
|
# * <tt>:message</tt> - A custom error message (default is: "can't be blank").
|
||
|
|
#
|
||
|
|
# There is also a list of default options supported by every validator:
|
||
|
|
# +:if+, +:unless+, +:on+, +:allow_nil+, +:allow_blank+, and +:strict+.
|
||
|
|
# See <tt>ActiveModel::Validations#validates</tt> for more information
|
||
|
|
def validates_presence_of(*attr_names)
|
||
|
|
validates_with PresenceValidator, _merge_attributes(attr_names)
|
||
|
|
end
|
||
|
|
end
|
||
|
|
end
|
||
|
|
end
|