MongoDB中精確元素數組中的更新字段我有一個這樣的文檔：{
_id:"43434",
heroes : [
{ nickname : "test", items : ["", "", ""] },
{ nickname : "test2", items : ["", "", ""] },
]}我能$set類的第二個元素。items數組中嵌入對象的數組。heros帶著nickname "test" ?結果：{
_id:"43434",
heroes : [
{ nickname : "test", items : ["", "new_value", ""] }, // modified here
{ nickname : "test2", items : ["", "", ""] },
]}
3 回答
白豬掌柜的
TA貢獻1893條經驗 獲得超10個贊
{"heros.nickname": "test"}{"heros.$ // <- the dollar represents the first matching array key index> db.denis.insert({_id:"43434", heros : [{ nickname : "test", items : ["", "", ""] }, { nickname : "test2", items : ["", "", ""] }]});
> db.denis.update(
{"heros.nickname": "test"},
{$set: {
"heros.$.items.1": "new_value"
}})> db.denis.find(){
"_id" : "43434",
"heros" : [
{"nickname" : "test", "items" : ["", "new_value", "" ]},
{"nickname" : "test2", "items" : ["", "", "" ]}
]}
楊魅力
TA貢獻1811條經驗 獲得超6個贊
db.collection.update({heroes:{$elemMatch:{ "nickname" : "test"}}},
{
$push: {
'heroes.$.items': {
$each: ["new_value" ],
$position: 1
}
}
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