本文介绍了插入对象MongoDB的数组的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有
{ "_id" : ObjectId("5a25af80d2c4dd065991dccc"), "username" : "abc@gmail", "password" : "$2a$10$ptFyLKtyyrL5gMYdXS6wV.HLUA4Py5iudMJDldf5qsHFS4.9TPCyy", "role" : "Admin", "__v" : 0, "list" : [ { "name" : "We", "arr" : [ "5a26d554677475818a795f75", "5a395bb0976d5304c07f7dd4" ] }, { "name" : "sandeep", "arr" : [ "5a26d554677475818a795f75" ] } ] }我想在list.arr中添加一个元素,其中name ='we' 并仅在元素不存在时添加
I want to add an element inside list.arr where name = 'we' and add only if the element does not exist
我如何执行此查询.
推荐答案通过使用此嵌套查询,我解决了这个问题. 我正在使用Node JS
By using this nested query I solved this problem. I'm doing it with Node JS
router.post('/prevList', (req, res) => { User.update({'_id':req.user.id, list: { $elemMatch: { name: req.body.name } } },{ $addToSet: { "list.$.arr": {$each: req.body.arr} } },function(err,data) { console.log(data); res.send(data) }); });这里
req.body: {name:'we',arr:["5a395bb0976d5304c07f7dd4"]}和req.user.id是身份验证ID.
希望这对您也有帮助.
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插入对象MongoDB的数组
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