在django操作數(shù)據(jù)庫的時候如何找出內(nèi)容不為空的數(shù)據(jù)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')

上面代碼中的models.Asset.objects.filter(~Q(nick = '')則是使用Q函數(shù)去找出nick不為空的數(shù)據(jù)，主要使用~Q

補充知識：Django報錯 HINT: Add or change a related_name argument to the definition for 'GodownentryReturn.suppl

Unhandled exception in thread started by <function wrapper at 0x05569030>
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：

因為在一個表中多次引用某個外鍵表，而且沒有指定唯一的releated_name，而導(dǎo)致的。

解決方案：

將同一個表中外鍵，增加不同的releated_name。

以上這篇Django中ORM找出內(nèi)容不為空的數(shù)據(jù)實例就是小編分享給大家的全部內(nèi)容了，希望能給大家一個參考，也希望大家多多支持腳本之家。

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