objects.all() <QuerySet [<Reporter: John Smith>]> # Fields are represented as attributes on the Python object. >>> r.full_name 'John Smith' # Django provides a rich database lookup API. >>> Reporter.objects.get(id=1) <Reporter: John Smith> >>> Reporter.objects.get(full_name__...
"post_id" = ("post"."id") ORDER BY U0."created_at" DESC LIMIT 1 ) AS "newest_commenter_email" FROM "post" 备注 本节中的例子是为了展示如何强制 Django 执行一个子查询。在某些情况下,可以写一个等价的查询集,更清楚或更有效地执行同样的任务。 从外部查询集中引用列¶ class OuterRef(...
e=Entry.objects.get(id=5) # Hits the database again to get the related Blog object. b=e.blog 接下来是使用 select_related 的例子: 1 2 3 4 5 6 # Hits the database. e=Entry.objects.select_related().get(id=5) # Doesn't hit the database, because e.blog has been prepopulated #...
if self.request.method == 'GET': kwargs.update({ 'data': data, }) kwargs.update({ 'searchqueryset': self.get_queryset(), 'load_all': self.load_all, }) return kwargs def render_to_response(self, context, **response_kwargs): try: # 修改为传出json data = [] object_list = ...
id,))) self.assertContains(response, past_question.question_text, status_code=200) 更多的测试思路 我们应该添加一个类似get_queryset的方法到ResultsView并为该视图创建一个新的类。这将与我们刚刚创建的非常类似;实际上将会有许多重复。 我们还可以在其它方面改进我们的应用,并随之不断增加测试。例如,发布一...
Django模型中的元选项和object对象 1、元选项,在模型类型中定义一个Meta类,用于设置元信息 1classStudent(models.Model):2name = models.CharField(max_length=20)3sex =models.BooleanField()4age =models.IntegerField()5contend = models.CharField(max_length=40)6#关联类名的小写7grade = models.ForeignKey(...
获取元信息,可以通过model对象._meta.verbose_name等获取自己通过verbose_name指定的表名,model对象._meta.model_name获取小写的表名,还有model对象.app_label可以获取这个对象的app应用名等等操作。例如:book_obj = models.Book.objects.get(id=1),book_obj._meta.model_name。
item = Item.objects.get(id=self.item_id) return HttpResponse(render_to_string('myapp/item_edit_form_success.html', {'item': item})) 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20.
# retrieve post by id post = get_object_or_404(Post, id=post_id, status='published') if request.method == 'POST': # Form was submitted form = EmailPostForm(request.POST) if form.is_valid(): # Form fields passed validation
杀手2049'>>>getsql()SELECT`t_movie`.`id`,`t_movie`.`name`,`t_movie`.`account`,`t_movie`.`image`,`t_movie`.`download_url`FROM`t_movie`ORDERBY`t_movie`.`id`ASCLIMIT1#获得最后一个>>>lt=TMovie.objects.last()>>>lt.name'钢铁侠3'>>>getsql()SELECT`t_movie`.`id`,`t_movie...