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On Mon, 15 Oct 2018 at 02:36, 徐军明 <zjhz...@gmail.com> wrote:

> Django 2.1.2, Postgres 10
>
> Model:
> class Product(models.Model):
> product_id = models.AutoField("产品ID", primary_key=True)
> ...
>
> class SpecItem(models.Model):
> spec_id = models.AutoField(primary_key=True)
> product = models.ForeignKey(Product, on_delete=models.CASCADE,
> related_name="product_specs", null=True)
> price = models.FloatField("价格", default=0)
> ...
>
> When exwcute
> qs = Product.objects.filter(valid=1)
> serializer = ProductSerializer(
> qs.annotate(cnt=Count("product_specs"),
> min_price=Min("product_specs__price")).filter(cnt__gt=0)
> .order_by("min_price")[offset:offset + limit],
> context={"request": request},
> many=True)
>
> It says django.db.utils.ProgrammingError: column
> "prome_product.product_name" must appear in the GROUP BY clause or be used
> in an aggregate function
>
>
> Can anyone help me?
>
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-- 
Adam

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