JSON bug fixed

main.py

@@ -36,6 +36,13 @@ def error(message):
     return jsonify({"error": message})
 
 
+def edges_to_json(edges):
+    return_list = []
+    for e in edges:
+        return_list.append({"start":e[0],"end":e[1],"weight":edges[e]})
+    return return_list
+
+
 @app.route('/api/nodes', methods=['GET'])
 def get_nodes():
     return jsonify({'nodes': graph.nodes})
@@ -43,7 +50,7 @@ def get_nodes():
 
 @app.route('/api/edges', methods=['GET'])
 def get_edges():
-    return jsonify({'edges': graph.edges})
+    return jsonify({'edges': edges_to_json(graph.edges)})
 
 
 @app.route('/api/nodes', methods=['POST'])
@@ -77,6 +84,10 @@ def create_edge():
     start = request.json['start']
     end = request.json['end']
     weight = request.json['weight']
+    try:
+        weight = float(weight)
+    except ValueError:
+        return error("Weight must be a number."), 400
     if weight < 0:
         return error("Weight must be positive."), 400
     if start == end:
@@ -86,13 +97,9 @@ def create_edge():
     if end not in graph.nodes:
         return error("End node does not exist."), 400
     if (start,end) in graph.edges or (end,start) in graph.edges:
-        return error("Edge exists already."), 400
-    try:
-        weight = float(weight)
-    except ValueError:
-        return error("Weight must be a number."), 400
+        return error("Edge already exists."), 400
 
-    edge = {(start,end): weight}
+    edge = {"start":start,"end":end, "weight": weight}
     graph.edges[(start,end)] = weight
 
     return jsonify(edge), 201
@@ -100,7 +107,7 @@ def create_edge():
 
 @app.route("/")
 def index():
-    return render_template("index.html", nodes=graph.nodes, edges=graph.edges)
+    return render_template("index.html", nodes=graph.nodes, edges=edges_to_json(graph.edges))
 
 
 if __name__ == '__main__':