I delete the contents of the alembic_version table in my database, and I then delete the contents of the alembic/versions directory.
I then run:
PYTHONPATH=. alembic -c ./alembic.ini revision --autogenerate -m 'your message about the migration'
and
alembic upgrade head
but despite the code and the database not matching, alembic seems to do nothing.
What am I doing wrong?
from __future__ import with_statement
from alembic import context
from sqlalchemy import engine_from_config, pool
from logging.config import fileConfig
# this is the Alembic Config object, which provides
# access to the values within the .ini file in use.
config = context.config
# Interpret the config file for Python logging.
# This line sets up loggers basically.
fileConfig(config.config_file_name)
# add your model's MetaData object here
# for 'autogenerate' support
# from myapp import mymodel
# target_metadata = mymodel.Base.metadata
from serve_spec_guru.db_global import db_unikernelguru
from serve_spec_guru.model_documents import Documents
from serve_spec_guru.model_filesets import Filesets
from serve_spec_guru.model_hosts import Hosts
from serve_spec_guru.model_issues import Issues
from serve_spec_guru.model_messages import Messages
from serve_spec_guru.model_payments import Payments
from serve_spec_guru.model_unikernels import Unikernels
from serve_spec_guru.model_websites import Websites
from serve_spec_users.model_users import Users
target_metadata = db_guru.Base.metadata
# other values from the config, defined by the needs of env.py,
# can be acquired:
# my_important_option = config.get_main_option("my_important_option")
# ... etc.
def run_migrations_offline():
"""Run migrations in 'offline' mode.
This configures the context with just a URL
and not an Engine, though an Engine is acceptable
here as well. By skipping the Engine creation
we don't even need a DBAPI to be available.
Calls to context.execute() here emit the given string to the
script output.
"""
url = config.get_main_option("sqlalchemy.url")
context.configure(
url=url, target_metadata=target_metadata, literal_binds=True)
with context.begin_transaction():
context.run_migrations()
def run_migrations_online():
"""Run migrations in 'online' mode.
In this scenario we need to create an Engine
and associate a connection with the context.
"""
connectable = engine_from_config(
config.get_section(config.config_ini_section),
prefix='sqlalchemy.',
poolclass=pool.NullPool)
with connectable.connect() as connection:
context.configure(
connection=connection,
target_metadata=target_metadata
)
with context.begin_transaction():
context.run_migrations()
if context.is_offline_mode():
run_migrations_offline()
else:
run_migrations_online()
