Cannot complete Flask-Migration

Question

I've setup a local Postgres DB with SQLAlchemy and cannot commit my first entry. I keep on getting this error...

ProgrammingError: (ProgrammingError) relation "user" does not exist
LINE 1: INSERT INTO "user" (name, email, facebook_id, facebook_token...

It seems like the fields aren't matching to those in the database. I'm trying to migrate using flask-migrate but, when I run $ python app.py db migrate I get this error...

raise util.CommandError("No such revision '%s'" % id_)
alembic.util.CommandError: No such revision '39408d6b248d'

It may be best to delete everything and start from scratch as it seems I have botched my database setup and / or migration but I'm not sure how to.

UPDATE: The database has started working now (I dropped and created it again). However, I'm still getting the same error trying to run migrations and it turns out the "no such revision '39408d6b248d' is referring to a migration from an unrelated project. I re-installed flask-migrate but same error.

Answer 1

flask-migrate will create a table named "alembic_version" in your database.
so you should drop this table and delete migrations folder in your project.
and then use $ python app.py db init again...
I think $ python app.py db migrate will work fine.

Answer 2

Alembic keeps the migration history in your database, this is why it still recognises there is another revision there. I keep my project on Heroku so I was able to just do heroku pg:pull ... to be able to get a new copy of my database. Prior to this you will have to drop your local db. In case you don't want to drop your local, I think dropping the table should work too. I use the PG Commander as a GUI tool to quickly browse my databases.