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import os |
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from logging.config import fileConfig |
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from sqlalchemy import engine_from_config |
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from sqlalchemy import pool |
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from alembic import context |
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# this is the Alembic Config object, which provides |
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# access to the values within the .ini file in use. |
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config = context.config |
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# Interpret the config file for Python logging. |
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# This line sets up loggers basically. |
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if config.config_file_name is not None: |
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fileConfig(config.config_file_name) |
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# add your model's MetaData object here |
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# for 'autogenerate' support |
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# from myapp import mymodel |
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# target_metadata = mymodel.Base.metadata |
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target_metadata = None |
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# other values from the config, defined by the needs of env.py, |
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# can be acquired: |
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# my_important_option = config.get_main_option("my_important_option") |
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# ... etc. |
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def run_migrations_offline() -> None: |
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"""Run migrations in 'offline' mode. |
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This configures the context with just a URL |
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and not an Engine, though an Engine is acceptable |
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here as well. By skipping the Engine creation |
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we don't even need a DBAPI to be available. |
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Calls to context.execute() here emit the given string to the |
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script output. |
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""" |
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url = os.getenv("DATABASE_URL", config.get_main_option("sqlalchemy.url")) |
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context.configure( |
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url=url, |
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target_metadata=target_metadata, |
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literal_binds=True, |
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dialect_opts={"paramstyle": "named"}, |
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) |
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with context.begin_transaction(): |
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context.run_migrations() |
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def run_migrations_online() -> None: |
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"""Run migrations in 'online' mode. |
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In this scenario we need to create an Engine |
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and associate a connection with the context. |
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""" |
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connectable = engine_from_config( |
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config.get_section(config.config_ini_section), |
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prefix="sqlalchemy.", |
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poolclass=pool.NullPool, |
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) |
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with connectable.connect() as connection: |
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context.configure( |
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connection=connection, target_metadata=target_metadata |
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) |
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with context.begin_transaction(): |
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context.run_migrations() |
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if context.is_offline_mode(): |
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run_migrations_offline() |
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else: |
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run_migrations_online() |
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