CommandError: Can't locate revision identified by '...' when migrating using Flask-Migrate
you delete the migration directory but the version has been saved in the database, so you have to delete the version info in the dabase,run
delete from alembic_version;
in mysql shell.
As suggested by @mirekphd, If this is a developing environment or a single app for test, just delete it, Else BACKUP the data in the table.
In my case I have accidentally deleted the most recent migration file but the alembic version (alembic_version) table refers to the deleted version.
So instead of droping the entire database, you can change the version_num field in the alembic_version table.
Following steps worked for me:
- Find the head using
db history- Update the version_num field to the head version.
- run migrate using
db migrate- upgrade the database
db upgrade
I try this on flask and it solve!
python app.py db revision --rev-id e39d16e62810
python app.py db migrate
python app.py db upgrade