Restore the connection method which was added so it can be overridden.

This reverts commit e428c75d.

class Person < ActiveRecord::Base
  include MyValidators

  validates :name, :presence => true, :uniqueness => true, :length => { :maximum => 100 }
  validates :email, :presence => true, :email => true
end

[#3058 status:resolved]
Signed-off-by: NJosé Valim <jose.valim@gmail.com>

This allows the following setup to work:

  # app/controllers/application_controller.rb
  class ApplicationController
    def default_url_options(options=nil)
      { :locale => I18n.locale }
    end
  end

  # From your views and controllers:
  I18n.locale                 #=> :en
  users_url                   #=> "/en/users"
  users_url(:pl)              #=> "/pl/users"
  user_url(1)                 #=> "/en/users/1"
  user_url(:pl, 1)            #=> "/pl/users/1"
  user_url(1, :locale => :pl) #=> "/pl/users/1"

If you provide all expected parameters, it still works as previously.
But if any parameter is missing, it tries to assign all possible ones
with the hash returned in default_url_options or the one passed straight
to the named route method.

Beware that default_url_options in ApplicationController is not shared
with ActionMailer, so you are required to always give the locale in your
email views.

Remove duplicated url_for code and move methods shared between ActionMailer and ActionController up to AbstractController.

For example, you could easily specify :created_at and :updated_at translations as:

  en:
    attributes:
      created_at: "Created at"
      updated_at: "Updated at"

This configuration is built on ActiveModel, so it means those translations are
shared between different ORMs as well (but always as a fallback).

Raise a RecordNotFound if an ID in nested attributes is given but doesn't return a record. [#2415 state:resolved]

Moved the validation logic to the association reflection and refactored autosave_association.rb a bit.

Don't use strings for callbacks, as these will be evaled. Rather use symbols, which uses a direct method dispatch.

Patch by Comron Sattari. [#3429 state:resolved]

Cleanup some code in nested_attributes.rb, autosave_association.rb, and associations.rb with AssociationReflection#collection_association?

Also cache the result value.

Add AssociationReflection#collection_association? which returns true if it's for a has_many or has_and_belongs_to_many association.

These reflect the settings that were previously included in the default
test_helper.rb, removed in d7d91733.

completely removed.

This makes feature detection easier with config.respond_to?(:gem)