Move validations in ActiveModel to validators, however all validatity checks are still in the class method.

Validator is simply sent to validate method. However, the API needs to change, so validate accepts a record.

Signed-off-by: NJoshua Peek <josh@joshpeek.com>

Move validator, human_name and human_attribute_name to ActiveModel, remove deprecated error messages and add i18n_scope and lookup_ancestors.
Signed-off-by: NCarl Lerche <carllerche@mac.com>

Signed-off-by: NJoshua Peek <josh@joshpeek.com>

Allows separate models that include ActiveModel::AttributeMethods to
use different sets of attribute matchers.
Signed-off-by: NJoshua Peek <josh@joshpeek.com>

Signed-off-by: NJoshua Peek <josh@joshpeek.com>

Signed-off-by: NYehuda Katz <wycats@gmail.com>

[#2301 state:committed milestone:2.3.5]
Signed-off-by: NJeremy Kemper <jeremy@bitsweat.net>

Signed-off-by: NJoshua Peek <josh@joshpeek.com>

Changed ActiveRecord to use new callbacks and speed up observers by only notifying events that are actually being consumed.
Signed-off-by: NJoshua Peek <josh@joshpeek.com>

Signed-off-by: NJoshua Peek <josh@joshpeek.com>

after a model had been saved. This is useful in the after_save callback
when you need to know what fields changed. At present there is no way
to do this other than have code in the before_save callback that takes
a copy of the changes Map, which I thought was a bit messy.

Example.

  person = Person.find_by_name('bob')
  person.name = 'robert'
  person.changes # => {'name' => ['bob, 'robert']}
  person.save
  person.changes # => {}
  person.previous_changes # => {'name' => ['bob, 'robert']}
  person.reload
  person.previous_changes # => {}
Signed-off-by: NJoshua Peek <josh@joshpeek.com>

[#430 state:resolved]

  Example :

    validates_format_of :subdomain, :without => /www|admin|mail/
Signed-off-by: NPratik Naik <pratiknaik@gmail.com>

[#2630 state:committed]
Signed-off-by: NJeremy Kemper <jeremy@bitsweat.net>

Signed-off-by: NJosé Valim <jose.valim@gmail.com>
Signed-off-by: NPratik Naik <pratiknaik@gmail.com>

Signed-off-by: NJosé Valim <jose.valim@gmail.com>

Signed-off-by: NJoshua Peek <josh@joshpeek.com>