rails--rails/activemodel/CHANGELOG.md

• Ability to specify multiple contexts when defining a validation.

  Example:

  class Person
    include ActiveModel::Validations
  
    attr_reader :name
    validates_presence_of :name, on: [:verify, :approve]
  end
  
  person = Person.new
  person.valid?                           # => true
  person.valid?(:verify)                  # => false
  person.errors.full_messages_for(:name)  # => ["Name can't be blank"]
  person.valid?(:approve)                 # => false
  person.errors.full_messages_for(:name)  # => ["Name can't be blank"]
  

  Vince Puzzella

• attribute_changed? now accepts a hash to check if the attribute was changed :from and/or :to a given value.

  Example:

  model.name_changed?(from: "Pete", to: "Ringo")
  

  Tejas Dinkar

• Fix has_secure_password to honor bcrypt-ruby's cost attribute.

  T.J. Schuck

• Updated the ActiveModel::Dirty#changed_attributes method to be indifferent between using symbols and strings as keys.

  William Myers

• Added new API methods reset_changes and changes_applied to ActiveModel::Dirty that control changes state. Previsously you needed to update internal instance variables, but now API methods are available.

  Bogdan Gusiev

• Fix has_secure_password not to trigger password_confirmation validations if no password_confirmation is set.

  Vladimir Kiselev

• inclusion / exclusion validations with ranges will only use the faster Range#cover for numerical ranges, and the more accurate Range#include? for non-numerical ones.

  Fixes range validations like :a..:f that used to pass with values like :be. Fixes #10593.

  Charles Bergeron

• Fix regression in has_secure_password. When a password is set, but a confirmation is an empty string, it would incorrectly save.

  Steve Klabnik and Phillip Calvin

• Deprecate Validator#setup. This should be done manually now in the validator's constructor.

  Nick Sutterer

Please check 4-0-stable for previous changes.