From 4956bdca5fc39ebd0e2074b6cbfaa7103824ce78 Mon Sep 17 00:00:00 2001
From: Eric0801 <33929918+Eric0801@users.noreply.github.com>
Date: Thu, 23 Oct 2025 10:56:43 +0800
Subject: [PATCH] fix: ensure plotly backend is set in result_view and custom
 routes

- Add pd.options.plotting.backend = 'plotly' at route level
- Fixes matplotlib ImportError in Railway deployment
- Ensures DataFrame.plot() uses plotly instead of matplotlib
- Resolves Internal Server Error on result_view pages
---
 main.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/main.py b/main.py
index 7ed1e04..9f72d18 100644
--- a/main.py
+++ b/main.py
@@ -415,6 +415,10 @@ def custom_post():
     else:
         flash('使用投組功能請先登入。', 'warning')
         return redirect(url_for('login'))
+
+    # Ensure plotly backend is set
+    pd.options.plotting.backend = "plotly"
+
     port = pd.read_csv(request.files['csv_file'], index_col=0, parse_dates=True)
     role = request.form.get('role')
     lookback = int(request.form.get('lookback'))
@@ -538,6 +542,10 @@ def result_view():
     else:
         sid = request.args.get('strategy_id')
     strategy_id = request.args.get('strategy_id')
+
+    # Ensure plotly backend is set (fixes Railway deployment issue)
+    pd.options.plotting.backend = "plotly"
+
     sql="""select * from strategy where id=%s;"""
     conn = psycopg2.connect(**SQL_CONFIG)
     with conn: