instance method
before_validation
Ruby on Rails 4.2.9
Since v3.0.20Signature
before_validation(*args, &block)Defines a callback that will get called right before validation happens.
class Person
include ActiveModel::Validations
include ActiveModel::Validations::Callbacks
attr_accessor :name
validates_length_of :name, maximum: 6
before_validation :remove_whitespaces
private
def remove_whitespaces
name.strip!
end
end
person = Person.new
person.name = ' bob '
person.valid? # => true
person.name # => "bob"
Parameters
-
argsrest -
blockblock
Source
# File activemodel/lib/active_model/validations/callbacks.rb, line 56
def before_validation(*args, &block)
options = args.last
if options.is_a?(Hash) && options[:on]
options[:if] = Array(options[:if])
options[:on] = Array(options[:on])
options[:if].unshift ->(o) {
options[:on].include? o.validation_context
}
end
set_callback(:validation, :before, *args, &block)
end
Defined in activemodel/lib/active_model/validations/callbacks.rb line 56
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Defined in ActiveModel::Validations::Callbacks::ClassMethods