before_validation

before_validation(*args, &block)

Instance Public methods

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"

Links:

https://github.com/rails/rails/blob/fe49f432c9a88256de753a3f2263553677bd7136/activemodel/lib/active_model/validations/callbacks.rb#L56

doc_ruby_on_rails

2025-01-10 15:47:30

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