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"""
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
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