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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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Remove overrated warning from adapter_test




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Fix bug introduced by changeset 3679 which caused custom attribute? methods to be overridden. Also ensure that ? methods are defined even if read method is customised. (closes #3677) [jonathan@bluewire.net.nz]

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Added Base.abstract_class? that marks which classes are not part of the Active Record hierarchy.  closes #3704

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Fixed to_xml across the board to use nice indention, better skip_attributes workings, no type on strings, and cleaned tests [DHH]

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Revert allow_concurrency change for better testing. Retrieve_connection in two steps to avoid side-effect bug (yuk).

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CHANGED DEFAULT: set ActiveRecord::Base.allow_concurrency to false.  Most AR usage is in single-threaded applications.

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Fixed that Base.save should always return false if the save didn't succeed, including if it has halted by before_save's (closes #1861, #2477) [DHH]

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CHANGED DEFAULT: ActiveRecord::Base.schema_format is now :ruby by default instead of :sql. This means that we'll assume you want to live in the world of db/schema.rb where the grass is green and the girls are pretty. If your schema contains un-dumpable elements, such as constraints or database-specific column types, you just got an invitation to either 1) patch the dumper to include foreign key support, 2) stop being db specific, or 3) just change the default in config/environment.rb to config.active_record.schema_format = :sql -- we even include an example for that on new Rails skeletons now. Brought to you by the federation of opinionated framework builders! [DHH]

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Added calculations: Base.count, Base.average, Base.sum, Base.minimum, Base.maxmium, and the generic Base.calculate. All can be used with :group and :having. Calculations and statitics need no longer require custom SQL. #3958 [Rick Olson]

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Reflections don't attempt to resolve module nesting of association classes. Simplify type computation.

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Added :count option to pagination that'll make it possible for the ActiveRecord::Base.count call to using something else than * for the count. Especially important for count queries using DISTINCT #3839 [skaes]. Added :select option to Base.count that'll allow you to select something else than * to be counted on. Especially important for count queries using DISTINCT (closes #3839) [skaes].

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* Introduce Unit Tests for pagination
* Allow count to work with :include by using count distinct.

[Kevin Clark & Jeremy Hopple]


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Add Reloadable::OnlySubclasses which handles the common case where a base class should not be reloaded, but its subclasses should be.

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Added reusable reloading support through the inclusion of the Relodable module that all subclasses of ActiveRecord::Base, ActiveRecord::Observer, ActiveController::Base, and ActionMailer::Base automatically gets [DHH]. Added auto-loading support for classes in modules, so Conductor::Migration will look for conductor/migration.rb and Conductor::Database::Settings will look for conductor/database/settings.rb [Nicholas Seckar]. Refactored extensions to module, class, and object in active support [DHH]

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