id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
32414	Syntax Error when combining __in and F() in filter	Douglas Franklin	nobody	"

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...
}}}"	Uncategorized	new	Database layer (models, ORM)	3.1	Normal		F()		Unreviewed	0	0	0	0	0	0