Refactor HasManyThroughAssociation to inherit from HasManyAssociation. Association callbacks and <association>_ids= now work with hm:t. Closes #11516 [rubyruy]


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Add efficient #include? to AssociationCollection (for has_many/has_many :through/habtm).  [stopdropandrew]

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Fix issue where the :uniq option of a has_many :through association is ignored when find(:all) is called.  Closes #9407 [cavalle]

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Ensure that ActiveRecord::Calculations disambiguates field names with the table name. Closes #11027 [cavalle]

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Reapplies [8865] with some fixes


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* TestCase: introduce declared setup and teardown callbacks. Pass a list of methods and an optional block to call before setup or after teardown. Setup callbacks are run in the order declared; teardown callbacks are run in reverse.  [Jeremy Kemper]


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Fix HasManyThrough Association so it uses :conditions on the HasMany Association.  Closes #9729 [danger]

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Ensure that has_many :through associations use a count query instead of loading the target when #size is called.  Closes #8800 [lifo]

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Fix #count on a has_many :through association so that it recognizes the :uniq option.  Closes #8801 [lifofifo]

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 Make create! on a has_many :through association return the association object.  Not the collection.  Closes #8786 [lifofifo]


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Fix has_many :through to add the appropriate conditions when going through an association using STI. Closes #5783. [Jonathan Viney]

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Pushing a record onto a has_many :through sets the association's foreign key to the associate's primary key and adds it to the correct association. Closes #5829.

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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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