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

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Deprecation: use :dependent => :delete_all rather than :exclusively_dependent => true. Closes #6024.

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has_one supports the :dependent => :delete option which skips the typical callback chain and deletes the associated object directly from the database. Closes #5927.

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

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Fixed usage of :limit and with_scope when the association in scope is a 1:m (closes #5208) [alex@purefiction.net]

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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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Call Inflector#demodulize on the class name when eagerly including an STI model.  Closes #5077 [info@loobmedia.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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Ensure that Associations#include_eager_conditions? checks both scoped and explicit conditions [Rick]

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Associations#select_limited_ids_list adds the ORDER BY columns to the SELECT DISTINCT List for postgresql. [Rick]

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Fixed that loading including associations returns all results if Load IDs For Limited Eager Loading returns none (closes #4528) [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 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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