Django中遇到的坑(长期更新)

1.Django分页出现UnorderedObjectListWarning: Pagination may yield inconsistent results with an unordered ob

将

messeges = MessegeModel.objects.all()

变为

messeges = MessegeModel.objects.get_queryset().order_by('id')

2.ajax提交表单403：

data: {'content':content,"csrfmiddlewaretoken":$("[name='csrfmiddlewaretoken']").val()}

3.ajax返回值未序列化：

1.序列化Quset对象

pictures = AlbumModel.objects.all()
            data['pictures'] = serializers.serialize('json', pictures)
            return JsonResponse(data)

在js中要进行反序列化的操作：
var formData = new FormData($("#form")[0]);

2.序列化单个实例(model)

user = simplejson.loads(serializers.serialize('json', [user])[1:-1])

4.Specifying a namespace in include() without providing an app_name '
django.core.exceptions.ImproperlyConfigured: Specifying a namespace in include() without providing an app_name is not supported. Set the app_name attribute in the included module, or pass a 2-tuple containing the list of patterns and app_name instead.
这是url中的`include的问题，这样写

url(r'^reviews/', include(('reviews.urls', 'reviews'), namespace='reviews'))

5.无法导入模块ImportError: cannot import name 'simplejson'
首先检查pip版本是不是用的python3的pip3，因为python3自带了pip3，所以可以创建一个pip3的软连接

ln -s /usr/local/python3/bin/pip3 /usr/bin/pip
(我的pip3在/usr/local/python3/bin/pip3，可以通过whereis查看)

4.xshell推出后django后台程序也被关闭

解决方法：

在启动项目的时候nohup python manage.py runserver 0.0.0.0:80

5.更新数据库的数据出现'BlogModel' object has no attribute 'update'

不直接对数据库进行update操作

 current_blog = BlogModel.objects.get(id=blog_id)
 current_blog.blog_name = blog_name
 current_blog.blog = blog
 current_blog.blog1 = blog1
 current_blog.save(update_fields=['blog_name','blog','blog1'])