rails--rails/activemodel/CHANGELOG.md

• Fix to working before/after validation callbacks on multiple contexts.

  Yoshiyuki Hirano

Rails 5.2.0.beta2 (November 28, 2017)

• No changes.

Rails 5.2.0.beta1 (November 27, 2017)

• Execute ConfirmationValidator validation when _confirmation's value is false.

  bogdanvlviv

• Allow passing a Proc or Symbol to length validator options.

  Matt Rohrer

• Add method #merge! for ActiveModel::Errors.

  Jahfer Husain

• Fix regression in numericality validator when comparing Decimal and Float input values with more scale than the schema.

  Bradley Priest

• Fix methods #keys, #values in ActiveModel::Errors.

  Change #keys to only return the keys that don't have empty messages.

  Change #values to only return the not empty values.

  Example:

  # Before
  person = Person.new
  person.errors.keys     # => []
  person.errors.values   # => []
  person.errors.messages # => {}
  person.errors[:name]   # => []
  person.errors.messages # => {:name => []}
  person.errors.keys     # => [:name]
  person.errors.values   # => [[]]
  
  # After
  person = Person.new
  person.errors.keys     # => []
  person.errors.values   # => []
  person.errors.messages # => {}
  person.errors[:name]   # => []
  person.errors.messages # => {:name => []}
  person.errors.keys     # => []
  person.errors.values   # => []
  

  bogdanvlviv

Please check 5-1-stable for previous changes.