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import os
from collections.abc import Generator
from dotenv import load_dotenv
from sqlalchemy import create_engine, inspect
from sqlalchemy.orm import DeclarativeBase, Session, sessionmaker
load_dotenv()
DATABASE_URL = os.getenv("DATABASE_URL", "sqlite:///./lumiere.db")
connect_args = {"check_same_thread": False} if DATABASE_URL.startswith("sqlite") else {}
engine = create_engine(DATABASE_URL, connect_args=connect_args)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
class Base(DeclarativeBase):
pass
def get_db() -> Generator[Session, None, None]:
db = SessionLocal()
try:
yield db
finally:
db.close()
def init_db() -> None:
import models
_rebuild_films_table_if_needed(models.Film)
Base.metadata.create_all(bind=engine)
def _rebuild_films_table_if_needed(film_model) -> None:
if not DATABASE_URL.startswith("sqlite"):
return
inspector = inspect(engine)
if "films" not in inspector.get_table_names():
return
existing_columns = {column["name"] for column in inspector.get_columns("films")}
expected_columns = {column.name for column in film_model.__table__.columns}
if existing_columns == expected_columns:
return
legacy_indexes = [index["name"] for index in inspector.get_indexes("films")]
legacy_table = "films_legacy_schema"
with engine.begin() as connection:
connection.exec_driver_sql(f"DROP TABLE IF EXISTS {legacy_table}")
connection.exec_driver_sql(f"ALTER TABLE films RENAME TO {legacy_table}")
for index_name in legacy_indexes:
connection.exec_driver_sql(f"DROP INDEX IF EXISTS {index_name}")
film_model.__table__.create(bind=connection)
target_columns = []
select_expressions = []
for column in film_model.__table__.columns:
name = column.name
if name in existing_columns:
target_columns.append(name)
select_expressions.append(name)
elif name == "context" and "mood_tags" in existing_columns:
target_columns.append(name)
select_expressions.append("mood_tags")
elif name == "rewatch":
target_columns.append(name)
select_expressions.append("0")
elif name in {"rewatch_count", "stars"}:
target_columns.append(name)
select_expressions.append("0")
elif name == "shelf":
target_columns.append(name)
select_expressions.append("'diary'")
elif name in {"created_at", "updated_at"}:
target_columns.append(name)
select_expressions.append("CURRENT_TIMESTAMP")
if target_columns:
connection.exec_driver_sql(
f"""
INSERT INTO films ({", ".join(target_columns)})
SELECT {", ".join(select_expressions)}
FROM {legacy_table}
"""
)
connection.exec_driver_sql(f"DROP TABLE {legacy_table}")
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