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Added support for using limits in eager loads that involve has_many and has_and_belongs_to_many associations

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Association validation does not belong in a before_save callback: move it into a validation method.  Restores the expected model.valid? == model.save.  Add tests for cancelling save by returning false from a before_save callback.  Remove assumption that before_destroy's return value indicates whether the record was destroyed.

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 Ticket 2221 - model.association.clear should destroy associated objects if :dependent => true instead of nullifying their foreign keys


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Fixed saving a record with two unsaved belongs_to associations pointing to the same object #2023 [Tobias Luetke]


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Fix eager loading error messages, allow :include to specify tables using strings or symbols. Closes #2222

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Saving a record with two unsaved belongs_to associations pointing to the same object fails #2023 [Tobias Luetke]


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Added support for limit and offset with eager loading of has_one and belongs_to associations. Using the options with has_many and has_and_belongs_to_many associations will now raise an ActiveRecord::ConfigurationError #1692 [Rick Olsen]

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Fixed that single-table inheritance sub-classes couldn't be used to limit the result set with eager loading #1215 [Chris McGrath]

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Updated all references to the old find_first and find_all to use the new style #1511 [Marcel Molina]

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Fixed problem with eager loading when using a has_and_belongs_to_many association using :association_foreign_key #1504 [flash@vanklinkenbergsoftware.nl]

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Fixed that clear_association_cache doesn't delete new associations on new records (so you can safely place new records in the session with Action Pack without having new associations wiped) #1494 [cluon]

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Fixed saving of in-memory association structures to happen as a after_create/after_update callback instead of after_save -- that way you can add new associations in after_create/after_update callbacks without getting them saved twice

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Added actual database-changing behavior to collection assigment for has_many and has_and_belongs_to_many #1425 [Sebastian Kanthak]

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Eager loading of dependent has_one associations won't delete the association #1212. Also, starting to refactor the tests to make them speedier, with optional support for transactional fixtures.


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Added a second parameter to the build and create method for has_one that controls whether the existing association should be replaced (which means nullifying its foreign key as well). By default this is true, but false can be passed to prevent it.

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Fixed that :delete_sql in has_and_belongs_to_many associations couldn't access record properties #1299 [Rick Olson]

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Fixed that :get, :post, and the others should take a flash array as the third argument just like process #1144 [rails@cogentdude.com]

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