Revert "Revert "Assert primary key does not exist in habtm when the association is defined, instead of doing that everytime a record is inserted.""

This reverts commit 2b82708b.

[#3128 state:resolved]

Conflicts:

	activerecord/lib/active_record/associations.rb
	activerecord/lib/active_record/associations/has_and_belongs_to_many_association.rb

Signed-off-by: NYehuda Katz <wycats@Yehuda-Katz.local>

Signed-off-by: NYehuda Katz <wycats@Yehuda-Katz.local>

Signed-off-by: NYehuda Katz <wycats@Yehuda-Katz.local>

Mark them as pending till I figure it out.

Broke stuff.

This reverts commit 520b8b59.

bunch of pending tests.

Insert generated association members in the same order they are specified when assigning to a has_many :through using the generated *_ids method

[#3491 state:committed]
Signed-off-by: NJeremy Kemper <jeremy@bitsweat.net>

[#1966 state:open]

This reverts commit 0d922885.

Conflicts:

	activerecord/lib/active_record/locking/optimistic.rb

Temporarily add submodules to the Rails repo for Arel and Rack::Mount. These submodules will be removed once we add proper Gemfile following to bundler

[#3259 state:resolved]
Signed-off-by: NEloy Duran <eloy.de.enige@gmail.com>