>>> from django.contrib.auth.models import User
>>> user = User.objects.get(pk=5)
>>> user.set_password('super-sekrit')
>>> user.save()

from django.contrib.auth.hashers import make_password
 
class User(models.Model):
 
  # fields go here..
 
  def set_password(self, raw_password):
    self.password = make_password(raw_password)

from django.db import models
 
PRIORITY_CHOICES = [(1, 'High'), (2, 'Low')]
 
class Todo(models.Model):
  content = models.CharField(max_length=100)
  is_done = models.BooleanField(default=False)
  owner = models.ForeignKey('auth.User')
  priority = models.IntegerField(choices=PRIORITY_CHOICES, default=1

def dashboard(request):
 
  todos = Todo.objects.filter(
    owner=request.user
  ).filter(
    is_done=False
  ).filter(
    priority=1
  )
 
  return render(request, 'todos/list.html', {
    'todos': todos,
  })

QuerySet。
 
class Manager(object):
 
  # SNIP some housekeeping stuff..
 
  def get_query_set(self):
    return QuerySet(self.model, using=self._db)
 
  def all(self):
    return self.get_query_set()
 
  def count(self):
    return self.get_query_set().count()
 
  def filter(self, *args, **kwargs):
    return self.get_query_set().filter(*args, **kwargs)
 
  # and so on for 100+ lines...

class IncompleteTodoManager(models.Manager):
  def get_query_set(self):
    return super(TodoManager, self).get_query_set().filter(is_done=False)
 
class HighPriorityTodoManager(models.Manager):
  def get_query_set(self):
    return super(TodoManager, self).get_query_set().filter(priority=1)
 
class Todo(models.Model):
  content = models.CharField(max_length=100)
  # other fields go here..
 
  objects = models.Manager() # the default manager
 
  # attach our custom managers:
  incomplete = models.IncompleteTodoManager()
  high_priority = models.HighPriorityTodoManager()

>>> Todo.incomplete.all()
>>> Todo.high_priority.all()

class TodoManager(models.Manager):
  def incomplete(self):
    return self.filter(is_done=False)
 
  def high_priority(self):
    return self.filter(priority=1)
 
class Todo(models.Model):
  content = models.CharField(max_length=100)
  # other fields go here..
 
  objects = TodoManager()

>>> Todo.objects.incomplete()
>>> Todo.objects.high_priority()

class TodoQuerySet(models.query.QuerySet):
  def incomplete(self):
    return self.filter(is_done=False)
 
  def high_priority(self):
    return self.filter(priority=1)
 
class TodoManager(models.Manager):
  def get_query_set(self):
    return TodoQuerySet(self.model, using=self._db)
 
class Todo(models.Model):
  content = models.CharField(max_length=100)
  # other fields go here..
 
  objects = TodoManager()

>>> Todo.objects.get_query_set().incomplete()
>>> Todo.objects.get_query_set().high_priority()
>>> # (or)
>>> Todo.objects.all().incomplete()
>>> Todo.objects.all().high_priority()

>>> Todo.objects.all().incomplete().high_priority()

class TodoQuerySet(models.query.QuerySet):
  def incomplete(self):
    return self.filter(is_done=False)
 
  def high_priority(self):
    return self.filter(priority=1)
 
class TodoManager(models.Manager):
  def get_query_set(self):
    return TodoQuerySet(self.model, using=self._db)
 
  def incomplete(self):
    return self.get_query_set().incomplete()
 
  def high_priority(self):
    return self.get_query_set().high_priority()

>>> Todo.objects.incomplete().high_priority() # yay!

from model_utils.managers import PassThroughManager
 
class TodoQuerySet(models.query.QuerySet):
  def incomplete(self):
    return self.filter(is_done=False)
 
  def high_priority(self):
    return self.filter(priority=1)
 
class Todo(models.Model):
  content = models.CharField(max_length=100)
  # other fields go here..
 
  objects = PassThroughManager.for_queryset_class(TodoQuerySet)()

def dashboard(request):
 
  todos = Todo.objects.filter(
    owner=request.user
  ).filter(
    is_done=False
  ).filter(
    priority=1
  )
 
  return render(request, 'todos/list.html', {
    'todos': todos,
  })

def dashboard(request):
 
  todos = Todo.objects.for_user(
    request.user
  ).incomplete().high_priority()
 
  return render(request, 'todos/list.html', {
    'todos': todos,
  })

class TodoManager(models.Manager):
 
  @models.querymethod
  def incomplete(query):
    return query.filter(is_done=False)