env.py
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"""Pyramid bootstrap environment. """
from alembic import context
from pyramid.paster import get_appsettings, setup_logging
from sqlalchemy import engine_from_config
from iso8583_web.models.meta import Base
config = context.config
setup_logging(config.config_file_name)
settings = get_appsettings(config.config_file_name)
target_metadata = Base.metadata
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=settings['sqlalchemy.url'])
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.
"""
engine = engine_from_config(settings, prefix='sqlalchemy.')
connection = engine.connect()
context.configure(
connection=connection,
target_metadata=target_metadata
)
try:
with context.begin_transaction():
context.run_migrations()
finally:
connection.close()
if context.is_offline_mode():
run_migrations_offline()
else:
run_migrations_online()