Question

I have a problem when trying to run syncdb. My models:

class TeachSubject(models.Model):
    teacher = models.ForeignKey(User)
    taught_class  = models.ForeignKey(SchoolClass)
    subject = models.ForeignKey(Subject)
    year = models.IntegerField(default=datetime.date.today().year)
    semester = models.IntegerField()

    #class Meta:
        #db_table = 'subject_teachers'

another file:

from customUsers.models import TeachSubject

class SubjectPeriod(models.Model):
    days = ((1, 'Mon'),
            (2, 'Tues'),
            (3, 'Wed'),
            (4,'Thurs'),
            (5,'Friday'))
    tsc = models.ForeignKey(TeachSubject)
    day = models.IntegerField(choices = days)
    period = models.IntegerField()

    class Meta:
        db_table = 'subject_period'
        unique_together = ('day', 'period', 'tsc')

Tried running syncdb, the table subject_period is created alright. The thing is, after checking the database itself, strangely no foreign key constraint is created for the line tsc = models.ForeignKey(TeachSubject).

Anyone can shed some light? Using django 1.2.4 (ps. I spent some time checking before posting here. So I beg your forgiveness if it was a careless mistake)

EDIT:

ok I deleted the tables and retried creating the tables using south instead. Works fine now, but it would be still good to know what went wrong with the former method.

Answer 1

I assume your two models are from different apps.

The docs says:

To refer to models defined in another application, you can explicitly specify a model with the full application label. For example, if the Manufacturer model above is defined in another application called production, you’d need to use:

so your foreignkeyfield will look like:

tsc = models.ForeignKey('customUsers.TeachSubject')

This also means you don’t have to import the models from the other application (also solving problems of circular imports.

It seems strange that you dont get an error – just nothing at all – but try that, it might just work.