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

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Make sure with_scope takes both :select and :joins into account when setting :readonly.  Allows you to save records you retrieve using finders on a has_many :through associations.  [Koz]



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Apply scoping during initialize instead of create.  Fixes setting of foreign key when using find_or_initialize_by with scoping. 


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Pushing a record on an association collection doesn't unnecessarily load all the associated records.

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Added counter optimization for AssociationCollection#any? so person.friends.any? won't actually load the full association if we have the count in a cheaper form [DHH]

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Oracle: resolve test failures, use prefetched primary key for inserts, check for null defaults. Factor out some common methods from all adapters. Closes #6515.

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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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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: count class method should be called with an options hash rather than two args for conditions and joins. Closes #6287.

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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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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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Fixed a bug which would cause .save to fail after trying to access a empty has_one association on a unsaved record.

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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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Oracle: use nonblocking queries if allow_concurrency is set, fix pessimistic locking, don't guess date vs. time by default (set OracleAdapter.emulate_dates = true for the old behavior), adapter cleanup. Closes #5635.

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Fixed that has_many.create ended up with duplicate objects (closes #5250) [daniel@nouvelles-solutions.com]

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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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