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
26238	confusing error message: django.core.exceptions.FieldError: Unknown field(s) specified when including a BinaryField in ModelForm.Meta.fields	luke crouch	nobody	"I had a `Model` with a `CharField`:
{{{
class PushApplication(models.Model):
    jws_key = models.CharField(blank=True, max_length=255)
}}}
I changed it to a `BinaryField`:
{{{
class PushApplication(models.Model):
    jws_key = models.BinaryField(blank=True)
}}}
When I tried to run makemigrations:
{{{
$ python manage.py makemigrations
...
django.core.exceptions.FieldError: Unknown field(s) (jws_key) specified for PushApplication
}}}

The problem was that I had a `ModelForm` with `jws_key` in the fields:
{{{
class PushAppForm(ModelForm):
    class Meta:
        fields = ['name', 'jws_key']
}}}

I removed `jws_key` from the `ModelForm` and it works.

But the error message sent me on an hour long web search trying to find out why changing a `CharField` to `BinaryField` would break migrations."	Cleanup/optimization	closed	Forms	dev	Normal	fixed			Ready for checkin	1	0	0	0	0	0