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Question

使谷歌的App Engine數據存儲的關鍵，我傳遞一個實體「ID」爲串中的URL，例如：

..../foo/234565 

我想使用的ID在下面的查詢：

//...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) 

我得到的錯誤：

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

是否有轉換的StringID簡單的方式變成了 「鑰匙」？

Answer 1

c := appengine.NewContext(r) 
//Retrieve the entity ID from the submitted form. Convert to an int64 
entity_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 CustomStruct 
datastore.Get(c, key, &entity)