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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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Raise error when trying to add to a has_many :through association.  Use the Join Model instead. [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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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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added :piggyback option to has_many :through relationships to pick up values from the join table as needed



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Fixed :through relations when using STI inherited classes would use the inherited class's name as foreign key on the join model


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Added option inheritance for find calls on has_and_belongs_to_many and has_many assosociations [DHH] Added option to specify :group, :limit, :offset, and :select options from find on has_and_belongs_to_many and has_many assosociations [DHH]
Added form_remote_for (form_for meets form_remote_tag) [DHH]

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Added preliminary support for join models [DHH] Added preliminary support for polymorphic associations [DHH] Refactored associations to use reflections to get DRYer, beware, major refactoring -- double check before deploying anything with this (all tests pass, but..)

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