英文:
DecodeField error when using huandu/facebook Golang FB api
问题
我正在尝试使用huandu/facebook Golang FB API在批量请求后使用Result.DecodeField提取FB用户信息、动态等。以下是一个简化版本,只包含一个批量请求。
我被这个问题困扰了一整天。如果你能帮忙检查一下这个问题,我将非常感激!
代码:
type User struct {
Id string `json:"id" facebook:"id"`
Name string `json:"name" facebook:"name"`
}
func batchRequests() {
paramsId := fb.Params{
"method": fb.GET,
"relative_url": "me",
}
results, errBatch := pSession.BatchApi(paramsId)
if errBatch != nil {
fmt.Println("Batch api error:", errBatch.Error())
return
}
fmt.Println("Results[0]:", results[0])
var user User
if err := results[0].DecodeField("body", &user); err != nil {
fmt.Println("Decode user err:", err.Error())
} else {
fmt.Println("user", res0)
}
return
}
调试信息:
Results[0]: map[code:200 headers:[map[name:Last-Modified value:2014-05-26T02:20:09+0000] map[name:Facebook-API-Version value:v2.0] map[name:ETag value:"53abd9d236bfbd61662d1139e66983f8d0220d1e"] map[name:Content-Type value:text/javascript; charset=UTF-8] map[name:Pragma value:no-cache] map[name:Access-Control-Allow-Origin value:*] map[name:Cache-Control value:private, no-cache, no-store, must-revalidate] map[name:Expires value:Sat, 01 Jan 2000 00:00:00 GMT]] body:{"id":"10152276269XXXXXX","first_name":"XXXX","gender":"male","last_name":"XXXX","link":"https://www.facebook.com/app_scoped_user_id/1015227626XXXXXX/","locale":"zh_TW","name":"XXXXXX","timezone":8,"updated_time":"2014-05-26T02:20:09+0000","verified":true}]
Decode user err: 字段 'body' 在结果中不是一个 JSON 对象。
英文:
I was trying to extract FB user info, feed, etc. with Result.DecodeField after a batch request, by using huandu/facebook Golang FB api. Below is the simplified version with a single request in a batch.
I was blocked by this for a whole day. Deep appreciate if you can help check this problem!
code:
type User struct {
Id string `json:"id" facebook:"id"`
Name string `json:"name" facebook:"name"`
}
func batchRequests() {
paramsId := fb.Params{
"method": fb.GET,
"relative_url": "me",
}
results, errBatch := pSession.BatchApi(paramsId)
if errBatch != nil {
fmt.Println("Batch api error:", errBatch.Error())
return
}
fmt.Println("Results[0]:", results[0])
var user User
if err := results[0].DecodeField("body", &user); err != nil {
fmt.Println("Decode user err:", err.Error())
} else {
fmt.Println("user", res0)
}
return
}
Debug msg:
Results[0]: map[code:200 headers:[map[name:Last-Modified value:2014-05-26T02:20:09+0000] map[name:Facebook-API-Version value:v2.0] map[name:ETag value:"53abd9d236bfbd61662d1139e66983f8d0220d1e"] map[name:Content-Type value:text/javascript; charset=UTF-8] map[name:Pragma value:no-cache] map[name:Access-Control-Allow-Origin value:*] map[name:Cache-Control value:private, no-cache, no-store, must-revalidate] map[name:Expires value:Sat, 01 Jan 2000 00:00:00 GMT]] body:{"id":"10152276269XXXXXX","first_name":"XXXX","gender":"male","last_name":"XXXX","link":"https://www.facebook.com/app_scoped_user_id/1015227626XXXXXX/","locale":"zh_TW","name":"XXXXXX","timezone":8,"updated_time":"2014-05-26T02:20:09+0000","verified":true}]
Decode user err: field 'body' is not a json object in result.
答案1
得分: 1
感谢OneOfOne的提示。以下是解决方案。
将以下代码替换为:
var user User
if err := results[0].DecodeField("body", &user); err != nil {
fmt.Println("Decode user err:", err.Error())
} else {
fmt.Println("user", res0)
}
替换为:
var user User
if body, ok := results[0]["body"].(string); ok {
jsonDec := json.NewDecoder(strings.NewReader(body))
if err := jsonDec.Decode(&user); err != nil {
fmt.Println("err:", err.Error())
} else {
fmt.Println("decode user", user)
}
} else {
fmt.Println("results[0]'s body is not string")
}
英文:
Thank for OneOfOne's hint. Below is the solution.
Replace
var user User
if err := results[0].DecodeField("body", &user); err != nil {
fmt.Println("Decode user err:", err.Error())
} else {
fmt.Println("user", res0)
}
with
var user User
if body, ok := results[0]["body"].(string); ok {
jsonDec := json.NewDecoder(strings.NewReader(body))
if err := jsonDec.Decode(&user); err != nil {
fmt.Println("err:", err.Error())
} else {
fmt.Println("decode user", user)
}
} else {
fmt.Println("results[0]'s body is not string")
}
答案2
得分: 1
图书馆文档误导了。Facebook在批量API响应中始终将“body”字段作为字符串返回。因此,“body”不能直接解码为用户结构。
我刚刚在库中添加了一个新的BatchResult
结构,用于存储解析的批量API响应。以下是使用这个新结构解码User
的示例。
// 省略了错误处理代码。
batchResult, _ := results[0].Batch()
var user User
batchResult.Result.Decode(&user)
fmt.Println("解码用户", user)
英文:
Library document was misleading. Facebook always returns a "body" field as string in batch api response. So "body" cannot be decoded to user struct directly.
I just add a new BatchResult
struct in library to store a parsed batch api response. Here is a sample to use this new struct to decode User
.
// error handling code is omitted.
batchResult, _ := results[0].Batch()
var user User
batchResult.Result.Decode(&user)
fmt.Println("decode user", user)
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