Update app.py

app.py

@@ -9,7 +9,7 @@ import pandas as pd
 import plotly.graph_objects as go
 import streamlit as st
 from pymongo import MongoClient
-
+from urllib.parse import quote_plus
 st.set_page_config(page_title="Student Skill Radar", layout="wide")
 
 # ------------------- Constants -------------------
@@ -130,21 +130,22 @@ def _client(uri: str):
 
 
 def get_mongo_uri(db_name: str | None = None) -> str | None:
-    """Priority: st.secrets.MONGO_URI -> env MONGO_URI -> compose from MONGO_USER/PASS/CLUSTER."""
-    uri = st.secrets.get("MONGO_URI") if hasattr(st, "secrets") else None
-    uri = uri or os.getenv("MONGO_URI")
-    if uri:
-        return uri
     user = os.getenv("MONGO_USER")
     pw = os.getenv("MONGO_PASS")
     cluster = os.getenv("MONGO_CLUSTER")
     if user and pw and cluster:
-        # allow db_name in path for SRV
+        user_q = quote_plus(user)
+        pw_q = quote_plus(pw)
         db_path = f"/{db_name}" if db_name else ""
-        return f"mongodb+srv://{user}:{pw}@{cluster}{db_path}?retryWrites=true&w=majority"
+        # TLS flags help on Spaces; SRV requires dnspython
+        return (
+            f"mongodb+srv://{user_q}:{pw_q}@{cluster}{db_path}"
+            f"?retryWrites=true&w=majority&tls=true&tlsAllowInvalidCertificates=true"
+        )
     return None
 
 
+
 @st.cache_data(show_spinner=False)
 def mongo_distinct(uri: str, db: str, coll: str, field: str) -> List[str]:
     try: