diff options
Diffstat (limited to 'activemodel/lib/active_model/validations/absence.rb')
| -rw-r--r-- | activemodel/lib/active_model/validations/absence.rb | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/activemodel/lib/active_model/validations/absence.rb b/activemodel/lib/active_model/validations/absence.rb new file mode 100644 index 0000000000..9b5416fb1d --- /dev/null +++ b/activemodel/lib/active_model/validations/absence.rb @@ -0,0 +1,31 @@ +module ActiveModel + module Validations + # == Active Model Absence Validator + class AbsenceValidator < EachValidator #:nodoc: + def validate_each(record, attr_name, value) + record.errors.add(attr_name, :present, options) if value.present? + end + end + + module HelperMethods + # Validates that the specified attributes are blank (as defined by + # Object#blank?). Happens by default on save. + # + # class Person < ActiveRecord::Base + # validates_absence_of :first_name + # end + # + # The first_name attribute must be in the object and it must be blank. + # + # Configuration options: + # * <tt>:message</tt> - A custom error message (default is: "must 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::Validation#validates</tt> for more information + def validates_absence_of(*attr_names) + validates_with AbsenceValidator, _merge_attributes(attr_names) + end + end + end +end |