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Add Dependencies.load_once_paths.


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Stop using defined? in Dependencies.qualified_const_defined? since defined? may invoke const_missing.

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Fix for depot and other applications with .13 style environment.rb files.   prints deprecation warnings to the log file


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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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Introduce Dependencies.warnings_on_first_load setting.  If true, enables warnings on first load of a require_dependency.  Otherwise, loads without warnings.  Disabled (set to false) by default.

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Enable warnings on first load only.  File which are loaded but raise an exception are not added to loaded set.

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 Introduce enable_warnings counterpart to silence_warnings.


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Turn warnings on when loading a file if Dependencies.mechanism == :load.  Common mistakes such as redefined methods will print warnings to stderr.  References #752.  References #1792.

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When loading classes using const_missing, raise a NameError if and only if the file we tried to load was not present.

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Fixed dependencies related infinite recursion bug when a controller file does not contain a controller class. Closes #1760. 

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