Reapplies [8865] with some fixes


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Dynamic finders on association collections respect association :limit. Closes #10227 [Jack Danger Canty]


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Make Dynamic Finders on Association Collections Respect Association :order [patrick.t.joyce, technoweenie]. Closes #10211


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

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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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