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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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