fix config

.env.example

 # Copy this file to .env
 
+APP_NAME = Shopping App
 # Change to your own database
 DATABASE_URL = mysql+pymysql://your_user:your_password@localhost/shopping     # This template use mysql
 # change your_user to your mysql username

app/backend/database.py

 from sqlmodel import SQLModel, Session, create_engine
 from app.core.config import settings
 
-engine = create_engine(settings.DATABASE_URL, echo=settings.DEBUG)
+engine = create_engine(settings.database_url, echo=settings.debug)
 
 
 def init_db():

app/backend/main.py

@@ -8,7 +8,7 @@ from backend.routes import auth
 from backend.database import init_db
 from core.config import settings
 
-app = FastAPI(title="Shopping App", version="1.0.0", debug=settings.DEBUG)
+app = FastAPI(title="Shopping App", version="1.0.0", debug=settings.debug)
 
 # initialize database
 init_db()

app/core/config.py

-import os
-from dotenv import load_dotenv
+from pathlib import Path
+from pydantic_settings import BaseSettings, SettingsConfigDict
 
-# Load environment variables from .env (located outside /app/)
-BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
-ENV_PATH = os.path.join(BASE_DIR, ".env")
-load_dotenv(ENV_PATH)
 
+class Settings(BaseSettings):
+    app_name: str = "Shopping App"
+    database_url: str  # Ensure lowercase to match the .env key
+    secret_key: str
+    debug: bool = True  # Lowercase to match Python conventions
 
-class Settings:
-    DATABASE_URL: str = os.getenv("DATABASE_URL")
-    SECRET_KEY: str = os.getenv("SECRET_KEY")
-    DEBUG: bool = os.getenv("DEBUG", "False").lower() in ["true", "1"]
-
-    if DATABASE_URL is None:
-        raise ValueError("DATABASE_URL is not set or empty")
+    model_config = SettingsConfigDict(
+        env_file=str(Path(__file__).resolve().parent.parent / ".env"),
+        env_file_encoding="utf-8",
+        case_sensitive=False,  # Allows case-insensitive environment variable keys
+    )
 
 
+# Create a singleton instance to use in the app
 settings = Settings()