class NilValidator

Validator to ensure an attribute is `nil`. Intended for use conditionally with `:if` or `:unless` to ensure an attribute is `nil` under one condition while a different validation, such as `:presence` or `:inclusion` is used under the dual of that condition.

Public Instance Methods

validate_each(record, attribute, value) click to toggle source

Validates that `value` is `nil`.

@param record [#errors, ActiveRecord::Base] an ActiveModel or ActiveRecord @param attribute [Symbol] name of attribute being validated. @param value [#nil?] value of `attribute` to check with `nil?` @return [void]

# File app/validators/nil_validator.rb, line 11
def validate_each(record, attribute, value)
  unless value.nil?
    record.errors[attribute] << 'must be nil'
  end
end