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Rearrange application resetting and preparation, fix bug with leaking subclasses hash in ActiveRecord::Base [Rick Olson]

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PostgreSQL: autodetected sequences work correctly with multiple schemas. Rely on the schema search_path instead of explicitly qualifying the sequence name with its schema.  Closes #5280.

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Require Tempfile explicitly for TestUploadedFile due to changes in class auto loading.  [Rick Olson]

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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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Deprecation: check whether instance variables have been monkeyed with before assigning them to deprecation proxies. Raises a RuntimeError if so.

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Fix Dispatcher.reset_application! so that AR subclasses are removed and Observers re-initialized *after* Reloadable classes are removed. Closes #5743.  [Rick Olson]

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Add support for the param_name parameter to the auto_complete_field helper. Fixes #5026 [david.a.williams@gmail.com]

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Add documentation for how to disable timestamps on a per model basis. Closes #5684. [matt@mattmargolis.net Marcel Molina Jr.]

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Deprecation! @session and @flash will be removed after 1.2. Use the session and flash methods instead. You'll get printed warnings during tests and logged warnings in dev mode when you access either instance variable directly.

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Tweak the Rails load order so observers are loaded after plugins, and reloaded in development mode. Closed #5279.  [Rick Olson]

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Refactor ActiveRecord::Base.reset_subclasses to #reset, and add global observer resetting.  [Rick Olson]

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