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from pymongo import MongoClient
import os
from dotenv import load_dotenv
load_dotenv()
client = None
db = None
def init_db():
global client, db
MONGO_URI = os.getenv('MONGO_URI')
DATABASE_NAME = os.getenv('DATABASE_NAME', 'recommendation_system')
if not MONGO_URI:
raise ValueError("MONGO_URI environment variable is required")
try:
client = MongoClient(MONGO_URI)
db = client[DATABASE_NAME]
# Test connection
client.admin.command('ping')
print(f"Connected to MongoDB database: {DATABASE_NAME}")
# Create indexes for performance
db.users.create_index("email", unique=True)
db.users.create_index("username", unique=True)
db.history.create_index([("user_id", 1), ("timestamp", -1)])
return db
except Exception as e:
print(f"Failed to connect to MongoDB: {e}")
raise e
def get_db():
global db
if db is None:
init_db()
return db |