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* `#to_param` returns `nil` if `#to_key` returns `nil`. Fixes #11399.
*Yves Senn*
* 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](https://github.com/rails/rails/blob/4-0-stable/activemodel/CHANGELOG.md) for previous changes.
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