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[英]Django ORM query to retrieve objects from a table and most recent objects from another foreign-key-related table?
[英]Retrieve query from django ORM with related fields
我在Django應用中創建了一個公司,兩個或兩個以上的人可以使用同一公司登錄。 我想將公司的一個用戶的數據顯示給公司的另一用戶。
為簡化起見:如果公司的一個用戶創建了一個對象,那么該對象對該公司的所有用戶都是可見的
但是我在提取數據時遇到了麻煩
型號
class ItemBatch(models.Model):
uploaded_by = models.ForeignKey(User, on_delete=models.CASCADE, related_name='uploaded_by')
name = models.CharField(max_length=100)
pid = models.IntegerField(blank=True)
quantity = models.IntegerField(blank=True)
class Teacher(models.Model):
user = models.OneToOneField(User, on_delete=models.CASCADE, primary_key=True)
company = models.ForeignKey(Company, on_delete=models.CASCADE, related_name='ship_company')
class User(AbstractUser):
is_supplier = models.BooleanField(default=False)
is_teacher = models.BooleanField(default=False)
email = models.EmailField(default=False)
class Company(models.Model):
company_name = models.CharField(max_length=255, default=0)
company_email = models.EmailField(max_length=255, default=0)
company_phone = models.CharField(max_length=255, default=0)
company_code = models.IntegerField(default=0)
Views.py
class allordersview(viewsets.GenericViewSet, mixins.ListModelMixin):
queryset = ItemBatch.objects.all()
serializer_class = holdSerializer
def list(self, request, *args, **kwargs):
queryset = self.filter_queryset(self.get_queryset())
queryset = queryset.filter(uploaded_by_id=request.user) # ??Changes??
.
.
return Response(serializer.data)
如何更改查詢集,使其顯示公司的所有ItemBatch?
你可以做
queryset.filter(uploaded_by__teacher__company=request.user.teacher.company)
PS:而不是覆蓋list
方法,而是覆蓋get_queryset
方法並在其中應用過濾器,例如
def get_queryset(self):
return ItemBatch.objects.filter(uploaded_by__teacher__company=self.request.user.teacher.company)
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