author | Pawel Solyga <Pawel.Solyga@gmail.com> |
Mon, 18 May 2009 19:37:38 +0200 | |
changeset 2327 | 6c7d0fba105c |
parent 109 | 620f9b141567 |
permissions | -rwxr-xr-x |
109
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""" |
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35. DB-API Shortcuts |
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get_object_or_404 is a shortcut function to be used in view functions for |
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performing a get() lookup and raising a Http404 exception if a DoesNotExist |
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exception was rasied during the get() call. |
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get_list_or_404 is a shortcut function to be used in view functions for |
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performing a filter() lookup and raising a Http404 exception if a DoesNotExist |
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exception was rasied during the filter() call. |
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""" |
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from django.db import models |
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from django.http import Http404 |
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from django.shortcuts import get_object_or_404, get_list_or_404 |
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class Author(models.Model): |
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name = models.CharField(maxlength=50) |
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def __str__(self): |
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return self.name |
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class ArticleManager(models.Manager): |
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def get_query_set(self): |
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return super(ArticleManager, self).get_query_set().filter(authors__name__icontains='sir') |
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class Article(models.Model): |
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authors = models.ManyToManyField(Author) |
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title = models.CharField(maxlength=50) |
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objects = models.Manager() |
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by_a_sir = ArticleManager() |
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def __str__(self): |
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return self.title |
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__test__ = {'API_TESTS':""" |
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# Create some Authors. |
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>>> a = Author.objects.create(name="Brave Sir Robin") |
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>>> a.save() |
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>>> a2 = Author.objects.create(name="Patsy") |
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>>> a2.save() |
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# No Articles yet, so we should get a Http404 error. |
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>>> get_object_or_404(Article, title="Foo") |
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Traceback (most recent call last): |
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... |
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Http404: No Article matches the given query. |
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# Create an Article. |
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>>> article = Article.objects.create(title="Run away!") |
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>>> article.authors = [a, a2] |
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>>> article.save() |
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# get_object_or_404 can be passed a Model to query. |
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>>> get_object_or_404(Article, title__contains="Run") |
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<Article: Run away!> |
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# We can also use the the Article manager through an Author object. |
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>>> get_object_or_404(a.article_set, title__contains="Run") |
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<Article: Run away!> |
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# No articles containing "Camelot". This should raise a Http404 error. |
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>>> get_object_or_404(a.article_set, title__contains="Camelot") |
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Traceback (most recent call last): |
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... |
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Http404: No Article matches the given query. |
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# Custom managers can be used too. |
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>>> get_object_or_404(Article.by_a_sir, title="Run away!") |
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<Article: Run away!> |
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# get_list_or_404 can be used to get lists of objects |
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>>> get_list_or_404(a.article_set, title__icontains='Run') |
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[<Article: Run away!>] |
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# Http404 is returned if the list is empty |
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>>> get_list_or_404(a.article_set, title__icontains='Shrubbery') |
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Traceback (most recent call last): |
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... |
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Http404: No Article matches the given query. |
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# Custom managers can be used too. |
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>>> get_list_or_404(Article.by_a_sir, title__icontains="Run") |
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[<Article: Run away!>] |
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"""} |