从字符串创建 Google App Engine 数据存储区键

Question

我将实体“id”作为字符串传递给 URL，例如：

..../foo/234565

我想在以下查询中使用 id：

//...i hace some code that gets stringId from the URL, and I verified that it works

stringId = ....

theKey, err := datastore.DecodeKey(stringId)

q := datastore.NewQuery("Foo").Filter("__key__ =", theKey)

我得到的错误：

proto: can't skip unknown wire type 7 for datastore.Reference

有没有一种简单的方法可以将 stringId 转换为“密钥”？

Answer 1

c := appengine.NewContext(r)//Retrieve the entity ID from the submitted form. Convert to an int64entity_id := r.FormValue("entity_id")entity_id_int, err := strconv.ParseInt(entity_id, 10, 64) if err != nil {  fmt.Fprint(w, "Unable to parse key")  return;}//We manufacture a datastore key based on the Kind and the //entity ID (passed to us via the HTTP request parameter.key := datastore.NewKey(c, kind, "", entity_id_int, nil)//Load the Entity this key represents.//We have to state the variable first, then conduct the Get operation //so the datastore understands the struct representing the entity.var entity CustomStructdatastore.Get(c, key, &entity)