migrate

How to force migrations to a DB if some tables already exist in Django?

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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

How to efficiently manage frequent schema changes using sqlalchemy?

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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

Django: dependencies reference nonexistent parent node

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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

Moving Git repository content to another repository preserving history

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I think the commands you are looking for are: cd repo2 git checkout master git remote add r1remote **url-of-repo1** git fetch r1remote git merge r1remote/master –allow-unrelated-histories git remote rm r1remote After that repo2/master will contain everything from repo2/master and repo1/master, and will also have the history of both of them.