0
我使用Django == 1.8.7，我有以下型號查詢GROUP_BY
# a model in users.py
class User(models.Model):
id = models.AutoField(primary_key=True)
username = models.CharField(max_length=100, blank=True)
displayname = models.CharField(max_length=100, blank=True)
# other fields deleted
# a model in healthrepo.py
class Report(models.Model):
id = models.AutoField(primary_key=True)
uploaded_by = models.ForeignKey(User, related_name='uploads',
db_index=True)
owner = models.ForeignKey(User, related_name='reports', db_index=True)
# other fields like dateofreport, deleted
我用下面的Django的查詢集：
Report.objects.filter(owner__id=1).values('uploaded_by__username',
'uploaded_by__displayname').annotate(
total=Count('uploaded_by__username')
)
我看到這個生成以下查詢：
SELECT T3."username", T3."displayname", COUNT(T3."username") AS "total" FROM "healthrepo_report"
INNER JOIN "users_user" T3 ON ("healthrepo_report"."uploaded_by_id" = T3."id")
WHERE "healthrepo_report」.」owner_id" = 1
GROUP BY T3."username", T3."displayname", "healthrepo_report"."dateofreport", "healthrepo_report」.」owner_id", "healthrepo_report"."uploaded_by_id"
ORDER BY "healthrepo_report"."dateofreport" DESC, "healthrepo_report"."user_id" ASC, "healthrepo_report"."uploaded_by_id" ASC
但是，我真正想要的只是基於「healthrepo_r eport「，」owner_id「，而不是多個字段。即我想要的是：
SELECT T3."username", T3."displayname", COUNT(T3."username") AS "total" FROM "healthrepo_report"
INNER JOIN "users_user" T3 ON ("healthrepo_report"."uploaded_by_id" = T3."id")
WHERE "healthrepo_report」.」owner_id" = 1
GROUP BY T3."username", T3."displayname" ORDER BY "healthrepo_report"."dateofreport" DESC, "healthrepo_report"."user_id" ASC, "healthrepo_report"."uploaded_by_id" ASC
我想知道爲什麼會發生這種情況，我如何得到基於單列的分組。