Q:

django programming error : column does not exist

Hello I am running a django app using Django. The app is working correctly . But when I add a new field in my model.py I got this error
ProgrammingError at /admin/challenges/challenge/
column challenge.category does not exist
LINE 1: ..., "challenge"."modified_at", "challenge"."title", "challenge...
I found similar questions but they didn't solve my problem.
I tried to run "python manage.py migrate" and it doesn't solve the problem
Could any one help me please ?

A:

I think you have not done make migration command. Perform 
python manage.py makemigrations

and then use command 
python manage.py migrate

