Mongoose : Add an element to an array of Objects under an Object field

Question

I'm trying to add an element to an array of Objects under an Object field This in my mongoose "Utilisateur" schema:

So what i'm trying to do here is to add an element to the "lien_vers" array this is the code that i wrote

  Utilisateur.findOneAndUpdate({ _id: mongoose.Types.ObjectId(auteur._id) },

                          {
                            $push: {
                              'relations.lien_vers': {
                                metadonnees: { nom_societe: societePersonalId },
                                identite: auteur._id.toString(),
                                canons: [""]

                              }
                            }
                          }, { upsert: true }
                          , function (error, doc) {
                            if (err) {
                              console.log("Something wrong when updating data!", err);
                            }

                            console.log("updated", doc.relations);
                          });

i've got no errors but there is no changes ! it seems like the update is not working correctly Any help plz

Cuong Le Ngoc · Accepted Answer · 2020-09-17 10:43:58Z

1

By default, findOneAndUpdate() returns the document as it was before update was applied. If you set new: true, findOneAndUpdate() will instead give you the object after update was applied.

Your code looks fine, the record is updated in your db, it just return the document before update in your callback. To get the updated document, you just need to add new: true to the options.

answered Sep 17, 2020 at 10:43

Cuong Le Ngoc

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2 Comments

Az Emna Over a year ago

There is no changes in my db ! i ve checked

Az Emna Over a year ago

i tried this solution with findOne then push then save and it worked

Az Emna · Accepted Answer · 2020-09-17 10:48:27Z

Eventually this solution worked for me

I insist on adding markModified() so that the save() method can detect changes

  Utilisateur.findOne({ _id: mongoose.Types.ObjectId(auteur._id) }, function (err, sal) {
                          if (err) return handleError(err);
                          else {


                            sal.relations.lien_vers.push({
                              metadonnees: { nom_societe: societePersonalId },
                              identite: auteur._id.toString(),
                              canons: [""]
                            });

                            console.log("before saving", sal.relations.lien_vers)
                            sal.markModified('relations');
                            sal.save(function (err) {
                              if (err) {
                                console.log(err)
                              }
                              console.log("doc saved")
                            });




                          }

                        });

                      }

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