英文:
Golang interface conversion error when trying to iterate through map of json array
问题
我在尝试遍历一些 JSON 数据的映射时遇到了问题。
原始的 JSON 数据如下所示：
"dataArray": [
{
"name": "default",
"url": "/some/url"
},
{
"name": "second",
"url": "/another/url"
}
]
映射的样子如下所示：
[map[name:default url:/some/url] map[name:second url:/another/url]]
代码如下所示：
for _, urlItem := range item.(map[string]interface{}){
做一些操作
}
当 JSON 中是一个对象时，这通常是有效的，但是这里的 JSON 是一个数组，我得到了以下错误：
panic: interface conversion: interface {} is []interface {}, not map[string]interface {}
非常感谢任何帮助！
英文:
I'm having an issue when I'm try to iterate through a map of some json.
The original JSON data looks like this:
"dataArray": [
{
"name": "default",
"url": "/some/url"
},
{
"name": "second",
"url": "/another/url"
}
]
the map looks like this:
[map[name:default url:/some/url] map[name:second url:/another/url]]
The code looks like this:
for _, urlItem := range item.(map[string]interface{}){
do some stuff
}
This normally works when it's a JSON object, but this is an array in the JSON and I get the following error:
> panic: interface conversion: interface {} is []interface {}, not map[string]interface {}
Any help would be greatly appreciated
答案1
得分: 4
错误是：
panic: 接口转换：interface {} 是 []interface {}，而不是 map[string]interface {}
在你的代码中，你将 item 转换为 map[string]interface{}：
for _, urlItem := range item.(map[string]interface{}) {
// 做一些操作
}
但实际上 item 是 []interface {}：将你的转换类型更改为这个。
因为你可以看到你的结果数据是：
[map[name:default url:/some/url] map[name:second url:/another/url]]
它是一个包含 map 的 array，而不是 map。
首先，你可以将数据转换为 []interface{}，然后获取该索引并将其转换为 map[string]interface{}。所以一个示例看起来像这样：
data := item.([]interface{})
for _, value := range data {
yourMap := value.(map[string]interface{})
// name 值
name := yourMap["name"].(string) // 以此类推
}
英文:
The error is :
> panic: interface conversion: interface {} is []interface {}, not
> map[string]interface {}
in your code you're converting item into map[string]interface{} :
for _, urlItem := range item.(map[string]interface{}){
do some stuff
}
But the actual item is []interface {} : change your covert type to this.
Because as you can see your result data is :
[map[name:default url:/some/url] map[name:second url:/another/url]]
it is an array that has map. not map.
First you can convert your data to []interface{} and then get the index of that and convert it to map[string]interface{}.
so an example will look like this :
data := item.([]interface{})
for _,value := range data{
yourMap := value.(map[string]interface{})
//name value
name := yourMap["name"].(string) // and so on
}
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