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Giorgos Korfiatis authored
The manager held a global flag `_for_update' on a single manager object, which could be read or set by multiple threads. select_for_update() is now provided by a subclass of QuerySet. It must be used as the last modifier of a query set, e.g. Project.objects.filter(state=1).select_for_update(), and cannot be combined with operators provided by other subclasses, such as values_list(). Since get() returns an element rather than a query set, the manager also provides a specific function get_for_update().
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