我有以下型号:
class Village(models.Model):
packages_required = models.IntegerField()
.
.
class PackageSent(models.Model):
village = models.ForeignKey('myapp.Village')
package_count = models.IntegerField()
sending_user = models.ForeignKey('myapp.Users')
sending_account_user = models.ForeignKey('myapp.Users')
.
.
我需要选择所有的Villages
以及它们的PackageSent
模型,而不仅仅是我可以根据进行分组的特定值。我构建了以下查询:
ps_query = PackageSent.objects.filter(
filter_logic
).annotate(
total_account_sent=Sum("package_count"),
sending_users=ArrayAgg("sender_user_id")
).distinct(
"sending_account_user_id"
)
Village.objects.filter(
filter_logic
).order_by(
order_by_logic
).annotate(
packages_missing=F("packages_required") - Sum("packagesent__package_count"),
users_involved=Count("packagesent__sending_account_user", distinct=True)
).prefetch_related(
models.Prefetch(
"packagesent_set",
queryset=ps_query, to_attr="packages_sent"
)
)
但是PackageSent
查询未实现annotate()+distinct(fields)错误
MySQL语法中PackageSent
模型所需的查询:
SELECT
*,
SUM(package_count) AS `total_account_sent`,
GROUP_CONCAT(sending_user) AS `sending_users`
FROM
`myapp_packagesent` ps
LEFT JOIN
`myapp_village` v ON v.id = ps.village_id
GROUP BY
`sending_account_user`,
`village_id`
ORDER BY
`total_account_sent` DESC
我希望在模板中执行此操作:
{% for village in object_list %}
.
.
.
{% for package_sent in village.packages_sent %}
.
.
.
{% endfor %}
{% endfor %}
我怎样才能达到我想要的结果
使用的技术:
Django 3.0
PostgreSQL
您应该使用.values按所需进行分组,而不必使用distinct:
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