Question

如何更新discussionReplay中的值。三人评论，评论，评论所有者。我可以使用User.findOne方法找到用户。这样可行。但现在我需要找到匹配“discussionId”的正确讨论并更新讨论的discussionReplay值。

//mongoose schema
var UserSchema = new mongoose.Schema({
    name: String,
    discussions: [{
        title: String,
        discussionsId: String,
        discussionReplay: {
                            comment: String,
                            commentImg: String,
                            commentOwner: String
                          }
    }]
});



//route
var comment = req.body.comment;
var userId = req.body.UserId;


//this part work. here i find the user from user's discussion id.Here is fine
 User.findOne({discussions: {$elemMatch: {discussionsId: req.params.id}}},function (err, theUser) {


            //here i want to push comment,commentImg, commentOwner. But i just doesn't work
           theUser.findByIdAndUpdate(userId,function(err,data){
                data.discussions: {$elemMatch: {discussionsId: req.body.id},
                {$push: {comment: comment, commentImg: "some/location/..." , commentOwner: 'some username'}}}
           })

  
 });

Answer 1

您可以简单地修改从find（）返回的对象，并在之后调用它的.save（）方法。

User.findOne({<criteria>}).then(theUser => {
    theUser.property.subpropertyarray.push(<new value>);
    return theUser.save();
}

Answer 2

这对我有用。这不会像.save方法那样刷新整个用户Schema，因此密码不会再次加密。

var toInsert =  {comment: "someComment", commentOwnerName: 'someName'};
                                          User.update(
                                          { _id: req.body.userId, discussions: { $elemMatch: { discussionsId: req.params.id } } },
                                          { $addToSet: { 'discussions.$.discussionReplay': toInsert } }, function(){})

使用mongoose和express更新mongodb中的数据

2 个答案: