barker/alembic/env.py

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import logging
from sqlalchemy import create_engine
from sqlalchemy import pool
from alembic import context
from barker.core.config import settings
logging.basicConfig()
logging.getLogger("sqlalchemy.engine").setLevel(settings.ALEMBIC_LOG_LEVEL)
logging.getLogger("alembic").setLevel(settings.ALEMBIC_LOG_LEVEL)
# Interpret the config file for Python logging.
# This line sets up loggers basically.
from barker.models.auth import User # noqa
target_metadata = User.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 = settings.SQLALCHEMY_DATABASE_URI
context.configure(
url=url,
target_metadata=target_metadata,
literal_binds=True,
dialect_opts={"paramstyle": "named"},
compare_type=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 = create_engine(settings.SQLALCHEMY_DATABASE_URI, poolclass=pool.NullPool,)
with connectable.connect() as connection:
context.configure(connection=connection, target_metadata=target_metadata, compare_type=True)
with context.begin_transaction():
context.run_migrations()
if context.is_offline_mode():
run_migrations_offline()
else:
run_migrations_online()