Django Unleashed

24.3 Custom Managers and Querysets

A manager is any Python class that inherits from the Manager class defined in Django’s db.models package. Django automatically generates a manager for a model class unless the objects attribute is explicitly declared.

To create and connect our custom PostManager, we simply declare it as a subclass of Manager and then add it as the objects attribute on Post. In Example 24.1, we also add the published() method to find all Post objects with a pub_date from before today’s date, much like the published() method defined in Tag and Startup.

Example 24.1: Project Code

blog/models.py in 74627b7014

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 1   from datetime import date  .       ... 14   class PostManager(models.Manager): 15 16        ...