问题描述
我必须更新数组中的一个元素，所以我要先提取值，然后再用新数据推送它。 我正在尝试这段代码，并且在pull和push语法中遇到错误。
User.findOneAndUpdate({email:req.user.email},{$pull: {Addtasks.status : {commonID:req.query.commonIDs}}},function (error,success) {
if (error) {
console.log(error);
} else {
User.findOneAndUpdate({email:req.user.email},{$push: {Addtasks.status: req.query.selectedValue}},success) {
if (error) {
console.log("Something wrong when updating data!");
} else {
res.redirect('/taskswriter');
console.log("success");
}
});
}
});
下面是Mongoose模式结构。我只想在Addtasks数组中提取元素“状态”，并用新元素推送它。
{
"_id" : ObjectId("5f4217154a5a411a9473d64b"),"email" : "charlott[email protected]","name" : "Charlotte Miles","Addtasks" : [
{
"commonID" : "66k4xorn77x","status" : "Requirement Completed","Date" : "Sun Aug 23 2020 12:43:57 GMT+0530 (India Standard Time)","exampleRadios" : "option1","otherdetails" : "bnbn","website" : "asad.com","keywords" : "anxiety disorders for children,anxiety disorders for adults","words" : 12345,"topic" : "How article is generated?","_id" : ObjectId("5f4217354a5a411a9473d64d")
},{
"commonID" : "offo357aak","Date" : "Sun Aug 23 2020 12:44:20 GMT+0530 (India Standard Time)","otherdetails" : "trhr","website" : "dsfdd.com","keywords" : "Kali from Kaliyug,Kaliki Vishnu Avatar,Vishnu's 10th Avatar","words" : 5678,"topic" : "When the Kaliyug era will end ?","_id" : ObjectId("5f42174c4a5a411a9473d651")
}
],"__v" : 0
}
解决方法
我认为您可以使用$set和位置operator简化为一个查询：
User.findOneAndUpdate({email:req.user.email},{ $set: { "Addtasks.$" : req.query.selectedValue } })
这将更新第一个匹配的数组元素。如果要更新所有元素，请使用this operator：
User.findOneAndUpdate({email:req.user.email},{ $set: { "Addtasks.$[]" : req.query.selectedValue } })