[英]Django - add-up Sum of multiple model fields
我如何在這里添加每個模型的總和? 最后,我只想為所有 3 個模型的所有 up_votes /down_votes 設置一個值。 請參閱下面的示例:
def calc_user_feedback():
users = User.objects.all()
try:
for user in users:
fed_qry_up_votes = Model1.objects.filter(author=user).aggregate(Sum('up_vote')) + \
Model2.objects.filter(author=user).aggregate(Sum('up_vote')) + \
Model3.objects.filter(author=user).aggregate(Sum('up_vote'))
fed_qry_down_votes = Model1.objects.filter(author=user).aggregate(Sum('down_vote')) + \
Model2.objects.filter(author=user).aggregate(Sum('down_vote')) + \
Model3.objects.filter(author=user).aggregate(Sum('down_vote'))
logger.info("Overall user feedback calculated successfully.")
except:
logger.info("Error processing task: 'Calculate user feedback', please investigate")
假設author
在每個模型上都沒有設置related_name
:
from django.db.models import F, Sum
users = (
User.objects.annotate(up_votes_1=Sum("model1_set__up_vote"))
.annotate(up_votes_2=Sum("model2_set__up_vote"))
.annotate(up_votes_3=Sum("model3_set__up_vote"))
.annotate(total=F("up_votes_1") + F("up_votes_2") + F("up_votes_3"))
)
現在您可以遍歷用戶並獲得每個用戶的總數。
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