Issue with unique key error on Many to Many field

[Malibu]

Hi there.  I've been doing Django for awhile but I am stumped on this one..  I have a many to many relationship with a 'through' definition

main.models:

class Client(models.Model):
    uid = models.CharField(max_length=128, unique=True)
    key = models.CharField(max_length=128)
    img = models.TextField()
    version = models.CharField(max_length=20)
    lastConnection = models.DateTimeField()
    role = models.CharField(max_length=128,default="")

tracker.models:

from main.models import Client

class PassengerAccess(models.Model):
    passenger = models.ForeignKey('Passenger',on_delete=models.CASCADE)
    client = models.ForeignKey(Client,on_delete=models.CASCADE)
    created = models.DateTimeField(auto_now_add=True,blank=True)
    selected = models.BooleanField(default=False)

class Passenger(models.Model):
    first_name = models.CharField(max_length=50)
    last_name = models.CharField(max_length=50)
    access_code = models.CharField(max_length=32)
    school_division = models.ForeignKey(SchoolDivision)
    open_clients = models.ManyToManyField(Client, through='PassengerAccess')


The error I get when I try to migrate is: django.db.utils.ProgrammingError: there is no unique constraint matching given keys for referenced table "tracker_passenger"

Any solution to this error appears to be related to a foreign key that is referencing a field that is not unique, but in this case passenger and client should both be accessing the primary key should they not?  I always use plain integer primary keys.

Any suggestions on how to troubleshoot this would be appreciated.

[Integr@te System]

Hi Issuer, 

Check your tracker_passenger.

https://docs.djangoproject.com/en/2.2/ref/models/fields/#django.db.models.ManyToManyField

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[Malibu]

Hi, thanks for the answer.  Of course, the moment I posted the question I figured out what it was.

I ended up checking my primary keys, and found that they didn't have unique constraints.  I added them and all was fine.

Must have fallen off during an import.

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