Django Managers

What is a Manager?

Django models have a Manager that is used to query the database. The Manager is the interface through which database query operations are provided to Django models.

How to setup a Manager?

To create a custom manager, you need to subclass models.Manager and add your custom methods. Here is an example:

yourpp/mangers.py

from django.db.models import Manager 

class CustomManager(Manager):
    def get_queryset(self):
        return super().get_queryset().filter(is_active=True)

yourpp/models.py

from django.db import models
from yourapp.managers import CustomManager


class YourModel(models.Model):
    objects = CustomManager()

    name = models.CharField(max_length=100)
    is_active = models.BooleanField(default=True)

With graphene ?

If you are using graphene, you can use the DjangoObjectType from graphene-django to use your custom manager.

yourapp/schema/object_types.py

from graphene_django import DjangoObjectType
from yourapp.models import YourModel
from yourapp.managers import CustomManager

class YourModelType(DjangoObjectType):
    class Meta:
        model = YourModel
        fields = "__all__"

    @classmethod
    def get_queryset(cls, queryset: CustomManager, info):
        return queryset.get_queryset_from_request(info.context)