在django操作数据库的时候如何找出内容不为空的数据呢？

from django.db.models import Q

class Index(VIew):
 def get(self, request):
 userObj = models.Asset.objects.filter(~Q(asset_id = '')
 return HttpResponse('yes')

上面代码中的models.Asset.objects.filter(~Q(nick = '')则是使用Q函数去找出nick不为空的数据，主要使用~Q

补充知识：Django报错 HINT: Add or change a related_name argument to the definition for 'GodownentryReturn.suppl

Unhandled exception in thread started by
Traceback (most recent call last):
File “G:\workspace\pycharm\carwin\carwin_env\lib\site-packages\django\utils\autoreload.py”, line 226, in wrapper
fn(*args, **kwargs)
File “G:\workspace\pycharm\carwin\carwin_env\lib\site-packages\django\core\management\commands\runserver.py”, line 116, in inner_run
self.check(display_num_errors=True)
File “G:\workspace\pycharm\carwin\carwin_env\lib\site-packages\django\core\management\base.py”, line 472, in check
raise SystemCheckError(msg)
django.core.management.base.SystemCheckError: SystemCheckError: System check identified some issues:

ERRORS:

article.GodownentryReturn.supplier: (fields.E304) Reverse accessor for ‘GodownentryReturn.supplier' clashes with reverse accessor for ‘GodownentryReturn.supplier'.

HINT: Add or change a related_name argument to the definition for ‘GodownentryReturn.supplier' or ‘GodownentryReturn.supplier'.

part.GodownentryReturn.supplier: (fields.E304) Reverse accessor for ‘GodownentryReturn.supplier' clashes with reverse accessor for ‘GodownentryReturn.supplier'.

HINT: Add or change a related_name argument to the definition for ‘GodownentryReturn.supplier' or ‘GodownentryReturn.supplier'.

原因：

因为在一个表中多次引用某个外键表，而且没有指定唯一的releated_name，而导致的。

解决方案：

将同一个表中外键，增加不同的releated_name。

以上这篇Django中ORM找出内容不为空的数据实例就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持python博客。