Pushing a record onto a has_many :through sets the association's foreign key to the associate's primary key. Closes #5815.

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Add records to has_many :through using <<, push, and concat by creating the association record. Raise if base or associate are new records since both ids are required to create the association. #build raises since you can't associate an unsaved record. #create! takes an attributes hash and creates the associated record and its association in a transaction.

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Fixed a bug which would cause .save to fail after trying to access a empty has_one association on a unsaved record.

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Cache nil results for has_one associations so multiple calls don't call the database.  Closes #5757. [Michael A. Schoen]

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Add AssociationCollection#sum since the method_missing invokation has been shadowed by Enumerable#sum. Closes #5500.

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Fixed that has_many.create ended up with duplicate objects (closes #5250) [daniel@nouvelles-solutions.com]

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delegate AssociationProxy#to_param to the association target so that associated models can be used in routes. [Rick]

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Fix the has_and_belongs_to_many #create doesn't populate the join for new records.  Closes #3692 [josh@hasmanythrough.com]

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Provide Association Extensions access to the instance that the association is being accessed from. Closes #4433 [josh@hasmanythrough.com]


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Raise error when trying to add to a has_many :through association.  Use the Join Model instead. [Rick]

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Fix the HasManyAssociation#count method so it uses the new ActiveRecord::Base#count syntax, while maintaining backwards compatibility.  [Rick]

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Added descriptive error messages for invalid has_many :through associations: going through :has_one or :has_and_belongs_to_many [Rick]
Added support for going through a polymorphic has_many association: (closes #4401) [Rick]


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Fixed that AssociationCollection#delete_all should work even if the records of the association are not loaded yet. [Florian Weber]


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Fixed that records returned from has_and_belongs_to_many associations with additional attributes should be marked as read only (fixes #4512) [DHH] DEPRECATED: Using additional attributes on has_and_belongs_to_many associations. Instead upgrade your association to be a real join model [DHH]

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Do not implicitly mark recordss of has_many :through as readonly but do mark habtm records as readonly (eventually only on join tables without rich attributes).

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Change has_many :through to use the :source option to specify the source association.  :class_name is now ignored. [Rick Olson]

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Raise error when trying to select many polymorphic objects with has_many :through or :include (closes #4226) [josh@hasmanythrough.com]

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Fixed has_many :through to include :conditions set on the :through association. closes #4020 [jonathan@bluewire.net.nz]

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Fix that has_many :through honors the foreign key set by the belongs_to association in the join model (closes #4259) [andylien@gmail.com / Rick]

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Nicer error message on has_many :through when :through reflection can not be found (closes #4042) [court3nay@gmail.com]

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Added Base.abstract_class? that marks which classes are not part of the Active Record hierarchy.  closes #3704

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