from flask import Flask
from flask_migrate import Migrate
from flask_sqlalchemy import SQLAlchemy
from sqlalchemy import MetaData
from sqlalchemy.orm import DeclarativeBase

class BaseModel(DeclarativeBase):
    pass

convention = {
    "ix": "ix_%(column_0_label)s",
    "uq": "uq_%(table_name)s_%(column_0_name)s",
    "ck": "ck_%(table_name)s_%(constraint_name)s",
    "fk": "fk_%(table_name)s_%(column_0_name)s_%(referred_table_name)s",
    "pk": "pk_%(table_name)s"
}

def connect_db_with_app():
    app.config["SQLALCHEMY_DATABASE_URI"] = "sqlite:///db.sqlite3"
    db.init_app(app)
    migrate.init_app(app, db)

metadata = MetaData(naming_convention=convention)
app = Flask(__name__)
db = SQLAlchemy(model_class=BaseModel, metadata=metadata)
migrate = Migrate(render_as_batch=True)