This makes sure that, in a HABTM association, only one join record is craeted.

This way we don't define all the validation methods for all associations by
default, but only when needed.

[#3355 state:resolved]

Add a :limit option to specify the maximum number of records that can be processed by accepts_nested_attributes_for

Store entire options hash in the class var rather than just the reject_if proc for the nested attributes

Conflicts:

	activerecord/lib/active_record/nested_attributes.rb

Rename nested attributes _delete to _destroy to reflect its actual behavior and DSL (:allow_destroy). Deprecation warning added. [#2889 state:resolved]
Signed-off-by: NEloy Duran <eloy.de.enige@gmail.com>

Raise an exception with friendlier error message when attempting to build a polymorphic belongs_to with accepts_nested_attributes_for. [#2318 state:resolved]
Signed-off-by: NEloy Duran <eloy.de.enige@gmail.com>

Break up DependencyModule's dual function of providing a "depend_on" DSL and "included" block DSL into separate modules. But, unify both approaches under AS::Concern.

Allow you to pass :all_blank to :reject_if option to automatically create a Proc that will reject any record with blank attributes.

Changed API of NestedAttributes to take an array, or hash with index keys, of hashes that have the id on the inside of the attributes hash and updated the FormBuilder to produce such hashes. Also fixed NestedAttributes with composite ids.
Signed-off-by: NMichael Koziarski <michael@koziarski.com>
Signed-off-by: NEloy Duran <eloy.de.enige@gmail.com>
[#1892 state:committed]

Signed-off-by: NMichael Koziarski <michael@koziarski.com>
[#1861 state:committed]

Signed-Off-By: NMichael Koziarski <michael@koziarski.com>

[#1202 state:committed]