mirror of
https://github.com/django/django.git
synced 2024-11-18 07:26:04 +00:00
42 lines
1.1 KiB
Python
42 lines
1.1 KiB
Python
"""
|
|
DB-API Shortcuts
|
|
|
|
``get_object_or_404()`` is a shortcut function to be used in view functions for
|
|
performing a ``get()`` lookup and raising a ``Http404`` exception if a
|
|
``DoesNotExist`` exception was raised during the ``get()`` call.
|
|
|
|
``get_list_or_404()`` is a shortcut function to be used in view functions for
|
|
performing a ``filter()`` lookup and raising a ``Http404`` exception if a
|
|
``DoesNotExist`` exception was raised during the ``filter()`` call.
|
|
"""
|
|
|
|
from django.db import models
|
|
|
|
|
|
class Author(models.Model):
|
|
name = models.CharField(max_length=50)
|
|
|
|
def __str__(self):
|
|
return self.name
|
|
|
|
|
|
class ArticleManager(models.Manager):
|
|
def get_queryset(self):
|
|
return super().get_queryset().filter(authors__name__icontains='sir')
|
|
|
|
|
|
class AttributeErrorManager(models.Manager):
|
|
def get_queryset(self):
|
|
raise AttributeError('AttributeErrorManager')
|
|
|
|
|
|
class Article(models.Model):
|
|
authors = models.ManyToManyField(Author)
|
|
title = models.CharField(max_length=50)
|
|
objects = models.Manager()
|
|
by_a_sir = ArticleManager()
|
|
attribute_error_objects = AttributeErrorManager()
|
|
|
|
def __str__(self):
|
|
return self.title
|