django.db.utils.IntegrityError: NOT NULL constraint failed after reseting migrations

Question

I need to save an object that contains a file and some other data. Although the file is stored on the /media folder, the entity is not saved in the database since saving it triggers an integration error.

django.db.utils.IntegrityError: NOT NULL constraint failed: app_eeg.filename

'filename' was a field I deleted and I already deleted the migrations folder and did the following commands:

python3 manage.py makemigrations app
python3 manage.py migrate app

Models.py

class EEG(models.Model):

    file = models.FileField(null=False)                                     
    status = models.BooleanField(default=True)                     
    timestamp = models.DateTimeField(auto_now_add=True)
    report = models.ForeignKey(Report, verbose_name=('report'), on_delete=models.CASCADE, related_name='%(class)s_report', null=True)
    operator = models.ForeignKey(Operator, verbose_name=('operator'), on_delete=models.CASCADE, related_name='%(class)s_operator', null=False)
    patient = models.ForeignKey(Patient, verbose_name=('patient'), on_delete=models.CASCADE, related_name='%(class)s_patient', null=False)

How can I fix this error from happening?

Answer 1

Drop the column from the table manually by connecting to the database and execute the SQL statement:

ALTER TABLE app_eeg DROP COLUMN filename;