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Refactor HasManyThroughAssociation to inherit from HasManyAssociation. Association callbacks and <association>_ids= now work with hm:t. Closes #11516 [rubyruy]


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Ensure that modifying has_and_belongs_to_many actions clear the query cache.  Closes #10840 [john.andrews]

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Fixed that habtm associations should be able to set :select as part of their definition and have that honored [DHH]

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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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Refactor association create and build so before & after callbacks behave consistently. Closes #8854.


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


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Simplify association proxy implementation by factoring construct_scope out of method_missing. Closes #6643.

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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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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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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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Do not implicitly mark recordss of has_many :through as readonly but do mark habtm records as readonly (eventually only on join tables without rich attributes).

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Added option inheritance for find calls on has_and_belongs_to_many and has_many assosociations [DHH] Added option to specify :group, :limit, :offset, and :select options from find on has_and_belongs_to_many and has_many assosociations [DHH]
Added form_remote_for (form_for meets form_remote_tag) [DHH]

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Added preliminary support for join models [DHH] Added preliminary support for polymorphic associations [DHH] Refactored associations to use reflections to get DRYer, beware, major refactoring -- double check before deploying anything with this (all tests pass, but..)

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 Rename Base.constrain to Base.with_scope so it doesn't conflict with existing concept of database constraints.  Make scoping more robust: uniform method => parameters, validated method names and supported finder parameters, raise exception on nested scopes.


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Added extension capabilities to has_many and has_and_belongs_to_many proxies [DHH] Added find_or_create_by_X as a second type of dynamic finder that'll create the record if it doesn't already exist [DHH] Added constrain scoping for creates using a hash of attributes bound to the :creation key [DHH]

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