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Remove useless code in #attribute_present? since 0 != blank?.  Closes #7249 [Josh Susser]. Fix minor doc typos. Closes #7157 [Josh Susser]

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Fix incorrect usage of #classify when creating the eager loading join statement.  Closes #7044 [Josh Susser]

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[DOC] clear up some ambiguity with the way has_and_belongs_to_many creates the default join table name.  #7072 [jeremymcanally]

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fix faulty inheritance tests and that eager loading grabs the wrong inheritance column when the class of your association is an STI subclass. Closes #6859 [protocool]

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find supports :lock with :include. Check whether your database allows SELECT ... FOR UPDATE with outer joins before using. Closes #6764.

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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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automatically add primary key to #select_limited_ids_list order by clause for databases that require order columns in the distinct statements (postgresql) [Rick]

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Reverted old select_limited_ids_list postgresql fix that caused issues in mysql.  Closes #5851 [Rick]

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Removes the ability for eager loaded conditions to be interpolated, since there is no model instance to use as a context for interpolation. #5553 [turnip@turnipspatch.com]

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Association collections have an _ids reader method to match the existing writer for collection_select convenience (e.g. employee.task_ids). The writer method skips blank ids so you can safely do @employee.task_ids = params[:tasks] without checking every time for an empty list or blank values.  References #1887, Closes #5780.

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Deprecation tests. Remove warnings for dynamic finders and for the foo_count ethod if it's also an attribute.

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We cant make MySQL 5 happy if it means making SQLite and PostgreSQL cry. So currently MySQL 5 is not fully supported for Rails when youre using eager loading (closes #6133, #6135). I have contacted MySQL to make them fix http://bugs.mysql.com/bug.php?id=13551 [DHH]

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Added parentheses around FROM clauses generated by Base and associations since MySQL 5 claim that to be the standard (and will screw up joins if its not there), see http://bugs.mysql.com/bug.php?id=13551 [DHH]

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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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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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