duaiwu8385
2018-03-08 09:02
浏览 31
已采纳

如何使用golang更新Firestore中的数组元素?

Following code:

Lobby := map[string]interface{}{
        "table_id"          :"new table id",
        "Status"            : true,
        "name"              : "shivam",
        "array":[]interface{}{0,1,3},// this replace existing array with new values
    }

result, err := client.Collection("lobbies").Doc("12").Set(ctx,Lobby,firestore.MergeAll)

I just want to update 2nd element in array with the new value

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以下代码:

 大厅:= map [string]  interface {} {
“ table_id”:“ new table id”,
“ Status”:true,
“ name”:“ shivam”,
“ array”:[] interface {} {0,1,  3},//用新值替换现有数组
} 
 
结果,错误:= client.Collection(“ lobbies”)。Doc(“ 12”)。Set(ctx,Lobby,firestore.MergeAll)\  n   
 
 

我只想用新值更新数组中的第二个元素

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1条回答 默认 最新

  • dongshi2458 2018-03-08 13:34
    已采纳

    There is no way to inform a database to replace a specific element in a slice or array.

    Your array field stores a slice and is not a map, so you need to implement your own code that will regenerate that slice in the way you need and replace it in the document, something like:

    Lobby := map[string]interface{} {
        "table_id" : "new table id",
        "Status"   : true,
        "name"     : "shivam",
        "array"    : []interface{}{0,1,3},
    }
    
    new_slice, err := change_my_slice(Lobby["array"])
    if err != nil {
        log.Errorf("Error message goes here")
        return nil, err
    }
    Lobby["array"] = new_slice
    
    result, err := client.Collection("lobbies").Doc("12").Set(ctx,Lobby,firestore.MergeAll)
    
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