I have a model called CarModel and a model called CarModelImage. I want to be able to have images be associated to multiple CarModels. For this I tried using a ManyToManyField.
When I visit the admin page for CarModelImage I get the following error.
ProgrammingError at /admin/cars/carmodelimage/
Exception Value: column cars_carmodelimage.model_id does not exist
Why is it that I can use the many to many in CarModel but not in CarModelImage?
Is there a way I can add id to all my models without having to drop the database?
class CarModel(models.Model):
title = models.CharField(max_length=80)
category = models.ManyToManyField(CarCategory)
...
class Meta:
verbose_name_plural = "Car Models"
def __str__(self):
return self.title
class CarModelImage(models.Model):
timestamp = models.DateTimeField(auto_now_add=True)
image = models.ImageField(upload_to='cars/')
model = models.ManyToManyField(CarModel)
# This is what I had before: model = models.ForeignKey(default=1, on_delete=models.CASCADE, to='cars.CarModel')
def filename(self):
return basename(self.image.name)
class Meta:
verbose_name_plural = "Car Model Images"
ordering = ["timestamp"]
def __str__(self):
return self.filename()
