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* Add case_sensitive option for confirmation validator in models.
*Akshat Sharma*
* Ensure `method_missing` is called for methods passed to
`ActiveModel::Serialization#serializable_hash` that don't exist.
*Jay Elaraj*
* Remove `ActiveModel::Serializers::Xml` from core.
*Zachary Scott*
* Add `ActiveModel::Dirty#[attr_name]_previously_changed?` and
`ActiveModel::Dirty#[attr_name]_previous_change` to improve access
to recorded changes after the model has been saved.
It makes the dirty-attributes query methods consistent before and after
saving.
*Fernando Tapia Rico*
* Deprecate the `:tokenizer` option for `validates_length_of`, in favor of
plain Ruby.
*Sean Griffin*
* Deprecate `ActiveModel::Errors#add_on_empty` and `ActiveModel::Errors#add_on_blank`
with no replacement.
*Wojciech Wnętrzak*
* Deprecate `ActiveModel::Errors#get`, `ActiveModel::Errors#set` and
`ActiveModel::Errors#[]=` methods that have inconsistent behavior.
*Wojciech Wnętrzak*
* Allow symbol as values for `tokenize` of `LengthValidator`.
*Kensuke Naito*
* Assigning an unknown attribute key to an `ActiveModel` instance during initialization
will now raise `ActiveModel::AttributeAssignment::UnknownAttributeError` instead of
`NoMethodError`.
Example:
User.new(foo: 'some value')
# => ActiveModel::AttributeAssignment::UnknownAttributeError: unknown attribute 'foo' for User.
*Eugene Gilburg*
* Extracted `ActiveRecord::AttributeAssignment` to `ActiveModel::AttributeAssignment`
allowing to use it for any object as an includable module.
Example:
class Cat
include ActiveModel::AttributeAssignment
attr_accessor :name, :status
end
cat = Cat.new
cat.assign_attributes(name: "Gorby", status: "yawning")
cat.name # => 'Gorby'
cat.status # => 'yawning'
cat.assign_attributes(status: "sleeping")
cat.name # => 'Gorby'
cat.status # => 'sleeping'
*Bogdan Gusiev*
* Add `ActiveModel::Errors#details`
To be able to return type of used validator, one can now call `details`
on errors instance.
Example:
class User < ActiveRecord::Base
validates :name, presence: true
end
user = User.new; user.valid?; user.errors.details
=> {name: [{error: :blank}]}
*Wojciech Wnętrzak*
* Change validates_acceptance_of to accept true by default.
The default for validates_acceptance_of is now "1" and true.
In the past, only "1" was the default and you were required to add
accept: true.
* Remove deprecated `ActiveModel::Dirty#reset_#{attribute}` and
`ActiveModel::Dirty#reset_changes`.
*Rafael Mendonça França*
* Change the way in which callback chains can be halted.
The preferred method to halt a callback chain from now on is to explicitly
`throw(:abort)`.
In the past, returning `false` in an ActiveModel or ActiveModel::Validations
`before_` callback had the side effect of halting the callback chain.
This is not recommended anymore and, depending on the value of the
`config.active_support.halt_callback_chains_on_return_false` option, will
either not work at all or display a deprecation warning.
Please check [4-2-stable](https://github.com/rails/rails/blob/4-2-stable/activemodel/CHANGELOG.md) for previous changes.
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