我有以下型号
models.py
class Category(models.Model):
label = models.CharField(max_length=100, unique=True)
description = models.CharField(max_length=255, blank=True)
class Expense(models.Model):
description = models.CharField(max_length=255, blank=True)
amount = models.DecimalField(max_digits=10, decimal_places=2, default=0.00)
category = models.ForeignKey(
Category,
on_delete=models.CASCADE,
null=True,
related_name='category'
)
class CategoryViewSet(viewsets.ModelViewSet):
queryset = Category.objects.order_by("-expense__expense")
我正在努力返回如何按照Expense模型中最常用的类别排序的类别列表,例如:
<Expense category=3>
<Expense category=3>
<Expense category=2>
<Expense category=3>
<Expense category=1>
<Expense category=1>
我想按此顺序返回:
<Category id=3>
<Category id=1>
<Category id=2>