Base.update_all :order and :limit options. Useful for MySQL updates that must be ordered to avoid violating unique constraints.

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Remove deprecated object transactions.  People relying on this functionality should install the object_transactions plugin at http://code.bitsweat.net/svn/object_transactions.  Closes #5637 [Koz, Jeremy Kemper]



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PostgreSQL: remove DateTime -> Time downcast. Bypass the DateTime migration test on 64-bit platforms since it may be a Time.

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Performance: patch cgi/session/pstore to require digest/md5 once rather than per #initialize. Closes #7583.

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Add environment variable RAILS_DEFAULT_DATABASE, which allows the builtin default of 'mysql' to be overridden.

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Cookie session store: ensure that new sessions doesn't reuse data from a deleted session in the same request.

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find_or_create_by_* takes a hash so you can create with more attributes than are in the method name. Closes #7368.

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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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Deprecation: remove deprecated url_for(:symbol, *args) and redirect_to(:symbol, *args) controller methods. Use named routes instead.

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Deprecation: remove deprecated update_element_function, start_form_tag, and end_form_tag. Use RJS and form_tag instead.

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Deprecation: remove deprecated link_to_image and link_image_to methods. Use link_to(image_path(...), url).

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