fix the bugs that were causing mutation response errors, and add duplicate subscription checks

MUTATIONS WORK BTW!!!

example/client/index.ts

@@ -16,6 +16,7 @@ const rl = createInterface({
 while (true) {
   const message = await rl.question("Enter a message");
   if (message) {
-    client.sendMutation("createMessage", { room: "1", message: message });
+    const result = await client.sendMutation("createMessage", { room: "1", message: message });
+    console.log("Mutation result", result);
   }
 }

example/client/package-lock.json

@@ -28,7 +28,7 @@
     },
     "node_modules/tether-ts": {
       "version": "1.0.3",
-      "resolved": "git+ssh://git@github.com/wisplite/tether-ts.git#8945de00ece92ce1e939a3ff70c5312f80e56dda",
+      "resolved": "git+ssh://git@github.com/wisplite/tether-ts.git#82a462ee116789dd6832fe5ff079a63fcb91afc4",
       "license": "ISC"
     },
     "node_modules/typescript": {

example/main.go

@@ -42,8 +42,11 @@ func main() {
 	}, []string{"messages"})
 
 	engine.RegisterMutation("createMessage", func(ctx *tether.MutationCtx) interface{} {
-		ctx.DB.Create(&Messages{ID: uuid.NewString(), Message: ctx.Params["message"].(string), SenderID: ctx.AuthCtx.UserID, RoomID: ctx.Params["room"].(string)})
-		return nil
+		msg := &Messages{ID: uuid.NewString(), Message: ctx.Params["message"].(string), SenderID: ctx.AuthCtx.UserID, RoomID: ctx.Params["room"].(string)}
+		if err := ctx.DB.Create(msg).Error; err != nil {
+			return map[string]interface{}{"error": err.Error()}
+		}
+		return msg
 	})
 
 	http.HandleFunc("/tether", engine.Handle)