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Formatting, grammar and spelling fixes for the associations documentation. [seanhussey] Closes #8899


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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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Improve Performance of calling create on has_many :through associations by avoiding loading the target collection. Closes #8150 [evan]

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Fix has_many :through to add the appropriate conditions when going through an association using STI. Closes #5783. [Jonathan Viney]  (sorry, forgot to commit the actual files)

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Backed out of new_record? to new? transformation as it would screw up existing models that did boolean calls on "new" attributes [DHH]

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Deprecated ActiveRecord::Base.new_record? in favor of ActiveRecord::Base.new? (old version still works until Rails 2.0) [DHH]

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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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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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