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- """Pylons bootstrap environment.
- Place 'pylons_config_file' into alembic.ini, and the application will
- be loaded from there.
- """
- from alembic import context
- from paste.deploy import loadapp
- from logging.config import fileConfig
- from sqlalchemy.engine.base import Engine
- try:
- # if pylons app already in, don't create a new app
- from pylons import config as pylons_config
- pylons_config['__file__']
- except:
- config = context.config
- # can use config['__file__'] here, i.e. the Pylons
- # ini file, instead of alembic.ini
- config_file = config.get_main_option('pylons_config_file')
- fileConfig(config_file)
- wsgi_app = loadapp('config:%s' % config_file, relative_to='.')
- # customize this section for non-standard engine configurations.
- meta = __import__("%s.model.meta" % wsgi_app.config['pylons.package']).model.meta
- # add your model's MetaData object here
- # for 'autogenerate' support
- # from myapp import mymodel
- # target_metadata = mymodel.Base.metadata
- target_metadata = None
- 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.
- """
- context.configure(
- url=meta.engine.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.
- """
- # specify here how the engine is acquired
- # engine = meta.engine
- raise NotImplementedError("Please specify engine connectivity here")
- with engine.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()
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