from __future__ import with_statement from alembic import context from sqlalchemy import engine_from_config, pool from logging.config import fileConfig from core.data.schema.base import metadata # 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 target_metadata = 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. """ raise Exception('Not implemented or configured!') 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. """ ini_section = config.get_section(config.config_ini_section) overrides = context.get_x_argument(as_dictionary=True) for override in overrides: ini_section[override] = overrides[override] connectable = engine_from_config( ini_section, prefix='sqlalchemy.', poolclass=pool.NullPool) with connectable.connect() as connection: context.configure( connection=connection, target_metadata=target_metadata, compare_type=True, compare_server_default=True, ) with context.begin_transaction(): context.run_migrations() if context.is_offline_mode(): run_migrations_offline() else: run_migrations_online()