[PYTHON] When changing the table name with flask

If you use flask_migrate to change the table name in your python code, be sure to do db migrate / db upgrade.

For example

class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(64), index=True)
    description = db.Column(db.String(120), index=True)
    def __repr__(self):
        return '<User %r>'%self.username

And after defining the table using Flask_SQLAlchemy,

class UserData(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(64), index=True)
    description = db.Column(db.String(120), index=True)
    def __repr__(self):
        return '<User %r>'%self.username

If you change the table name (class name) like

flask db migrate
flask db upgrade

I have to

sqlalchemy.exc.ProgrammingError: (psycopg2.errors.UndefinedTable) relation "user_data" does not exist

I get angry with "I don't have a table!" Just because you changed it in your python code doesn't mean that it implicitly changes it. It seems that you need to explicitly do flask db migrate / flask db upgrade. It looks like git.

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