Add hot topics widget

back/main.py

@@ -581,6 +581,19 @@ def get_post_info():
         return jsonify({"code": 1000, "data": data})
     except Exception as e:
         return jsonify({"code": 2003, "data": str(e)})
+
+@app.route('/api/hot_topics', methods=['GET'])
+def get_hot_topics():
+    try:
+        rows = db.session.query(
+            Hashtag.name,
+            db.func.count(Hashtag.name).label('count')
+        ).group_by(Hashtag.name).order_by(db.func.count(Hashtag.name).desc()).limit(5).all()
+
+        data = [{"name": name, "count": int(count)} for name, count in rows]
+        return jsonify({"code": 1000, "data": {"list": data}})
+    except Exception as e:
+        return jsonify({"code": 2003, "data": str(e)})
     
 # --- 彩蛋 ---
 @app.route('/api/teapot', methods=['GET'])