Use db_config in Alembic

# are written from script.py.mako

# output_encoding = utf-8

sqlalchemy.url = driver://user:pass@localhost/dbname

[post_write_hooks]

# post_write_hooks defines scripts or Python functions that are run

from logging.config import fileConfig

from pathlib import Path

from sqlalchemy import engine_from_config

from sqlalchemy import pool

from sqlalchemy import create_engine

from alembic import context

if config.config_file_name is not None:

    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 clams import db, db_config

target_metadata = db.Model.metadata

# other values from the config, defined by the needs of env.py,

# can be acquired:

    script output.

    """

    url = config.get_main_option("sqlalchemy.url")

    url = db_config.get_database_uri(Path("./instance"))

    context.configure(

        url=url,

        target_metadata=target_metadata,

    and associate a connection with the context.

    """

    connectable = engine_from_config(

        config.get_section(config.config_ini_section, {}),

        prefix="sqlalchemy.",

        poolclass=pool.NullPool,

    )

    connectable = create_engine(db_config.get_database_uri(Path("./instance")))

    with connectable.connect() as connection:

        context.configure(

            connection=connection, target_metadata=target_metadata

        )

        context.configure(connection=connection, target_metadata=target_metadata)

        with context.begin_transaction():

            context.run_migrations()