Added comments

api/app/blueprints/portfolio.py

@@ -25,8 +25,12 @@ def get_portfolio():
     email = get_email_or_abort_401()
 
     return_portfolio = []
+
+    # Get all transactions of current user
     transactions = db.session.execute("SELECT symbol, SUM(count), SUM(price), MAX(time) FROM `transactions` WHERE email = '" + email + "' GROUP BY symbol;").all()
 
+    # If there are no transactions, return empty portfolio
+    # Otherwise calculate portfolio
     if transactions is not None:
         for row in transactions:
             data = {
@@ -37,6 +41,7 @@ def get_portfolio():
                 'current_price': 0
             }
 
+            # Add current share value to portfolio
             query_share_price = db.session.query(SharePrice).filter_by(symbol=row[0]).order_by(SharePrice.date.desc()).first()
             if query_share_price is not None:
                 data['current_price'] = query_share_price.as_dict()['price']