I'm using alembic today, and I found a problem, if I changed the
column, it'll automatically create add and drop statment, just like
this:
op.add_column('bas_grp_user', sa.Column('username', sa.Integer(),
nullable=False))
op.drop_column('bas_grp_user', u'USERNAME')
But when I ran the upgrade I got:
sqlalchemy.exc.OperationalError: (OperationalError) (1060, "Duplicate
column name 'username'") 'ALTER TABLE bas_grp_user ADD COLUMN username
INTEGER NOT NULL' ()
so the problem is that the table is already exists in my database, so
when it excute the first statement it'll be fail. So I think drop
should be put in front of add.
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