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* Assigning an unknown attribute key to an `ActiveModel` instance during initialization
will now raise `ActiveModel::AttributeAssignment::UnknownAttributeError` instead of
`NoMethodError`
```ruby
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
``` ruby
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:
```ruby
class User < ActiveRecord::Base
validates :name, presence: true
end
```
```ruby
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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