Opened 4 years ago

Last modified 4 years ago

#32414 closed Uncategorized

Syntax Error when combining __in and F() in filter — at Initial Version

Reported by: Douglas Franklin Owned by: nobody
Component: Database layer (models, ORM) Version: 3.1
Severity: Normal Keywords: F()
Cc: Triage Stage: Unreviewed
Has patch: no Needs documentation: no
Needs tests: no Patch needs improvement: no
Easy pickings: no UI/UX: no

Description

Similar to https://code.djangoproject.com/ticket/32151

I have a simple Google Calendar Events application. Profiles generate calendar tokens with GSuite Oauth (not shown) that are used to make CalendarEvents in my database (postgres:9.6). CalendarEvents queried via a particular CalendarToken have the token's profile on the model. See oversimplified example below:

class Profile(models.Model):
    name = models.CharField(max_length=32)

class CalendarEvent(models.Model):
   profile = models.ForeignKey(Profile, on_delete=models.CASCADE)
   attendees = models.ManyToManyField(Profile, on_delete=models.CASCADE)

I'm trying to annotate whether a profile is "attending" the event, by checking if the profile is in the attendees ManyToMany:

CalendarEvent.objects.annotate(
    is_attending=Case(
        When(
            profile__in=F('attendees'),
            then=Value(True)
        ),
        default=Value(False),
        output_field=models.BooleanField()
    )
)

Generates an invalid syntax error (replacing db name with {APP}):

ProgrammingError: syntax error at or near ""{APP}_calendarevent_attendees""
LINE 1: ...CASE WHEN ("{APP}_calendarevent"."profile_id" IN "{APP}_ca...

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