1 """

     2 35. DB-API Shortcuts

     3 

     4 ``get_object_or_404()`` is a shortcut function to be used in view functions for

     5 performing a ``get()`` lookup and raising a ``Http404`` exception if a

     6 ``DoesNotExist`` exception was raised during the ``get()`` call.

     7 

     8 ``get_list_or_404()`` is a shortcut function to be used in view functions for

     9 performing a ``filter()`` lookup and raising a ``Http404`` exception if a

    10 ``DoesNotExist`` exception was raised during the ``filter()`` call.

    11 """

    12 

    13 from django.db import models

    14 from django.http import Http404

    15 from django.shortcuts import get_object_or_404, get_list_or_404

    16 

    17 class Author(models.Model):

    18     name = models.CharField(max_length=50)

    19 

    20     def __unicode__(self):

    21         return self.name

    22 

    23 class ArticleManager(models.Manager):

    24     def get_query_set(self):

    25         return super(ArticleManager, self).get_query_set().filter(authors__name__icontains='sir')

    26 

    27 class Article(models.Model):

    28     authors = models.ManyToManyField(Author)

    29     title = models.CharField(max_length=50)

    30     objects = models.Manager()

    31     by_a_sir = ArticleManager()

    32 

    33     def __unicode__(self):

    34         return self.title