When it make sense to use a different name for a custom manager of the Django`s model?

[Seti Volkylany]

If why know good article about it, send me link, I will resolve of itself.

[Derek]

https://docs.djangoproject.com/en/1.9/topics/db/managers/#modifying-a-manager-s-initial-queryset

Note the difference between overriding the default queryset (called "objects" by Django) vs creating your own - in the example shown, it is called "dahl_objects" (but of course should be a name that makes sense for your app).

[Seti Volkylany]

Sorry, Derek but I am do not understand your answer.

"(but of course should be a name that makes sense for your app)" - Why? I was completely satisfied with default manager`s name - "objects"

In my project, I am using next code:

class Poll(models.Model):

[fields and class Meta]

objects = models.Manager() objects = PollManager.from_queryset(PollQuerySet)()

[other code]

where PollManager is my custom manager, PollQuerySet - my custom QuerySet for the model Poll

If I follow your`s advice then must next:

class Poll(models.Model):

[fields and class Meta]

objects = models.Manager() polls = PollManager.from_queryset(PollQuerySet)()

[other code]

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[Derek]

If you read the docs, it is explained.

Unless there is good reason to, you should keep the default "objects" code as is, and make up a name for your own, new, custom manager.  If you don't, and call your "objects", then you must realise you overriding the way that Django allows you to get all data back for a model.

This code of yours does not make sense:

    objects = PollManager.from_queryset(PollQuerySet)()

You need to create something like:

class MinePollManager(models.Manager):
    def get_queryset(self):
        return super(MinePollManager, self).get_queryset().filter(code='mine')

and then in your model:
      

    objects = models.Manager()  # the default manager

    mine = MinePollManager()  # choose name that is appropriate for your app/use

Hope this clarifies.