Code Explainers

Code explainers tagged #activemodel

ruby 
class HostnameValidator < ActiveModel::EachValidator
  MAX_LENGTH = 253
  LABEL = /\A(?!-)[a-z0-9-]{1,63}(?<!-)\z/i
 

Writing a custom hostname validator in Rails

validation custom validator regex
Intermediate 8 steps
ruby 
class RegistrationForm
  include ActiveModel::Model
  include ActiveModel::Attributes
 

How a Rails form object spans two models

form object validations transactions
Intermediate 7 steps