Django Migration Error: Column does not exist

Question

Python 3, Django 1.8.5, Postgres

I have a model Sites that has been working fine. I recently tried to add a field, airport_code, and migrate the data.

Answer 1

I ran into this issue as well and the answer by @Nexus helped. I thought I'd provide details of my specific case here for better illustrate the cause of the issue. It seems like a potential bug to me.

I have a model Brand as follows:

class Brand(BaseModelClass):
    name = CharField(max_length=256, unique=True)
    website = ForeignKey(URL, on_delete=CASCADE, null=True, blank=True)

I was running a python manage.py makemigrations after adding a Boolean field as follows:

class Brand(BaseModelClass):
    name = CharField(max_length=256, unique=True)
    website = ForeignKey(URL, on_delete=CASCADE, null=True, blank=True)
    trusted = Boolean(default=True)

When running the makemigrations command, I recieved an error similar to OP's:

django.db.utils.ProgrammingError: column appname_brand.trusted does not exist

Per @Nexus' suggestion, I went through the stacktrace, line-by-line, assuming that it wasn't some core issue with Django. As it turns out, in one of apps forms.py file I had the following:

choices={(str(brand.id), brand.name) for brand in Brand.objects.all()}

The solution was to simply comment-out that line, run manage.py makemigrations, then run manage.py migrate. Afterwards, I uncommented the line and everything and my forms' functionality worked just as before.