alembic util command error can't find identifier

Question

I\'m trying to use alembic to handle local migrations on my project. It worked the first time, but then I needed to delete the folder and restart.(don\'t ask why, I just had to)

Answer 1

SirKaiserKai's solution didn't work for me, likely because I made some stupid mistake last time I migrated and deleted a file that I should have kept.

Instead of dropping the alembic_revision table I just updated the value in version_num to match where I knew my DB was at.

Make sure you use the migration ID of the file that matches the current state of your database

1. Check the missing migration number

   psql=> SELECT * FROM alembic_version;
   +-------------------------+
   |      version_num        |
   +-------------------------+
   |  |
   +-------------------------+
   (1 row)
   

2. Update the value

   psql=> UPDATE alembic_version
   psql->    SET version_num = ''
   psql->    WHERE version_num = '';
   UPDATE 1
   

If your database is in a state other than the migration file then you're just going to continue to have errors. However, you could run a alembic upgrade head if the is a migration file continuing from where you left off previously, and that would run all the migrations post this state as well.