from __future__ import with_statement import os from logging.config import fileConfig from sqlalchemy import engine_from_config from sqlalchemy import pool from sqlalchemy import create_engine from sqlalchemy.ext.declarative import declarative_base from alembic import context from ereuse_devicehub.config import DevicehubConfig # 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 = None from ereuse_devicehub.db import db target_metadata = declarative_base().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 get_url(): # url = os.environ["DATABASE_URL"] url = DevicehubConfig.SQLALCHEMY_DATABASE_URI return url 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 = get_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. """ # connectable = engine_from_config( # config.get_section(config.config_ini_section), # prefix="sqlalchemy.", # poolclass=pool.NullPool, # ) url = get_url() connectable = create_engine(url) with connectable.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()