INSTALLED_APPS = [
    …
    'django_extra_tools',
]

from django_extra_tools.db.models.aggregates import First

Table.objects.aggregate(First('col1', order_by='col2'))

from django_extra_tools.db.models.aggregates import Last

Table.objects.aggregate(Last('col1', order_by='col2'))

from django_extra_tools.db.models.aggregates import Median

Table.objects.aggregate(Median('col1'))

from django_extra_tools.db.models.aggregates import StringAgg

Table.objects.aggregate(StringAgg('col1'))

from django.db import models
from django_extra_tools.db.models import timestampable

class MyModel(timestampable.CreatedAtMixin, models.Model):
    pass

model = MyModel()
print(model.created_at)

from django.contrib.auth.models import User
from django.db import models
from django_extra_tools.db.models import timestampable

class MyModel(timestampable.CreatedByMixin, models.Model):
    pass

user = User.objects.get(username='user')
model = MyModel(created_by=user)
print(model.created_by)

from django.db import models
from django_extra_tools.db.models import timestampable

class MyModel(timestampable.UpdatedAtMixin, models.Model):
    operation = models.CharField(max_length=10)

model = MyModel()
print(model.updated_at)
model.operation = 'update'
model.save()
print(model.updated_at)

from django.contrib.auth.models import User
from django.db import models
from django_extra_tools.db.models import timestampable

class MyModel(timestampable.UpdatedByMixin, models.Model):
    operation = models.CharField(max_length=10)

user = User.objects.get(username='user')
model = MyModel()
print(model.updated_by)
model.operation = 'update'
model.save_by(user)
print(model.updated_by)

from django.db import models
from django_extra_tools.db.models import timestampable

class MyModel(timestampable.DeletedAtMixin, models.Model):
    pass

model = MyModel()
print(model.deleted_at)
model.delete()
print(model.deleted_at)

from django.contrib.auth.models import User
from django.db import models
from django_extra_tools.db.models import timestampable

class MyModel(timestampable.DeletedByMixin, models.Model):
    pass

user = User.objects.get(username='user')
model = MyModel()
print(model.deleted_by)
model.delete_by(user)
print(model.deleted_by)

from django_extra_tools.db.models import batch_qs

qs = Table.objects.all()
start, end, total, queryset = batch_qs(qs, 10)

from django_extra_tools.db.models import pg_version

version = pg_version()

from django_extra_tools.http import HttpResponseGetFile

return HttpResponseGetFile(filename='file.txt', content=b'file content', content_type='file/text')

from django_extra_tools.wsgi_request import get_client_ip

ip = get_client_ip(request)

PRIVATE_IPS_PREFIX = ('10.', '172.', '192.', )

from django_extra_tools.management import OneInstanceCommand

class Command(OneInstanceCommand):
    name = 'mycommand'

    def handle_instance(self, *args, **options):
        # some operations

    def lock_error_handler(self, exc):
        # Own error handler
        super(Command, self).lock_error_handler(exc)

from django_extra_tools.management import NagiosCheckCommand

class Command(NagiosCheckCommand):
    def handle_nagios_check(self, *args, **options):
        return self.STATE_OK, 'OK'

MIDDLEWARE_CLASSES = (
    ...
    'django_extra_tools.middleware.XhrMiddleware'
)

XHR_MIDDLEWARE_ALLOWED_ORIGINS = '*'
XHR_MIDDLEWARE_ALLOWED_METHODS = ['POST', 'GET', 'OPTIONS', 'PUT', 'DELETE']
XHR_MIDDLEWARE_ALLOWED_HEADERS = ['Content-Type', 'Authorization', 'Location', '*']
XHR_MIDDLEWARE_ALLOWED_CREDENTIALS = 'true'
XHR_MIDDLEWARE_EXPOSE_HEADERS = ['Location']

AUTHENTICATION_BACKENDS = (
    'django.contrib.auth.backends.ModelBackend',
    'django_extra_tools.auth.backends.ThroughSuperuserModelBackend',
)

AUTH_BACKEND_USERNAME_SEPARATOR = ':'

INSTALLED_APPS = [
    …
    'django_extra_tools.auth.view_permissions'
]

from django_extra_tools.lockers import lock

lock('unique_lock_name')

from django_extra_tools.lockers import FileLocker

lock = FileLocker()('unique_lock_name')

DEFAULT_LOCKER_CLASS = 'django_extra_tools.lockers.FileLocker'

DEFAULT_LOCKER_CLASS = 'django_extra_tools.lockers.CacheLocker'