Add tag suggestions

back/main.py

@@ -706,6 +706,39 @@ def get_hot_topics():
         return jsonify({"code": 1000, "data": {"list": data}})
     except Exception as e:
         return jsonify({"code": 2003, "data": str(e)})
+
+@app.route('/api/tag_suggest', methods=['GET'])
+def tag_suggest():
+    try:
+        prefix = request.args.get("prefix", "")
+        if prefix is None:
+            prefix = ""
+        prefix = str(prefix).strip().lstrip('#')
+        if not prefix:
+            return jsonify({"code": 1000, "data": {"list": []}})
+
+        limit = request.args.get("limit", 5, type=int)
+        if limit < 1:
+            limit = 1
+        if limit > 10:
+            limit = 10
+
+        rows = db.session.query(
+            Hashtag.name,
+            db.func.count(Hashtag.name).label('count')
+        ).filter(
+            Hashtag.name.like(f"{prefix}%")
+        ).group_by(
+            Hashtag.name
+        ).order_by(
+            db.func.count(Hashtag.name).desc(),
+            Hashtag.name.asc()
+        ).limit(limit).all()
+
+        data = [name for name, _ 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'])