This is the right way to go about it. When you run a migration on production, you best be sure what it’s going to do to your database, as some actions might not be rollbackable. The confirmation prompt is there to make you stop and think twice before potentially cause harm. Some migration operations are … Read more
I ran into a similar issue, where db\migrations\operations\models.py was throwing a KeyError after renaming a model through PyCharm’s refactoring (renaming). Apparently the refactoring also took place in the migration file. When opening up the migration file and changing back to the original naming, the makemigrations command worked fine.
You run rake db:create once and only once, and you run it first. Then you run rake db:migrate every time you add/change a migration. You’ve either already run this migration, or you are pointing at a database that already exists and already contains a table named users. My guess is that you ran the migration … Read more
DO will do the trick: DO $$ DECLARE row record; BEGIN FOR row IN SELECT tablename FROM pg_tables WHERE schemaname=”public” — and other conditions, if needed LOOP EXECUTE format(‘ALTER TABLE public.%I SET SCHEMA [new_schema];’, row.tablename); END LOOP; END; $$;
These is my step-by-step guide, based on steps we have taken at my company during our move from a classic ASP.Net Webforms to ASP.Net MVC. It’s not perfect, and still ongoing since we have to do this in stages because of the size of the site, but perhaps someone else will find and file an … Read more
I solved the same problem with these steps : Delete your database (db.sqlite3 in my case) in your project directory Remove everything from __pycache__ folder under your project subdirectory For the application you are trying to fix, go to the folder and clear migrations and __pycache__ directories When you are sure you have cleared all … Read more
You’re not doing anything wrong; this is a problem between Django and Python 3.7. Django has a fix, but that fix hasn’t made it into a new version yet. You can install the stable version of Python, Python 3.6, in the meantime.
When you apply a migration, Django inserts a row in a table called django_migrations. That’s the only way Django knows which migrations have been applied already and which have not. So the rows in that table have to match the files in your migrations directory. If you’ve lost the migration files after they were applied, … Read more
Alembic is a new database migrations tool, written by the author of SQLAlchemy. I’ve found it much easier to use than sqlalchemy-migrate. It also works seamlessly with Flask-SQLAlchemy. Auto generate the schema migration script from your SQLAlchemy models: alembic revision –autogenerate -m “description of changes” Then apply the new schema changes to your database: alembic … Read more
Solution – 1 Remove pyc files from your migrations folder. Solution – 2 Need to remove that reference from testBolt.0001_initial by editing migration file. Solution – 3 Remove the new changes from the models and run python manage.py migrate –fake Now again modify your models with new changes Run python manage.py makemigrations And then again … Read more