db.find 得到空值

Question

We are trying to figure out how get the data from the database but the result get "null"

the model

const mongoose = require("mongoose");

const ClubSchema = new mongoose.Schema({
  nomClub: String,
  classement: String,
  dateMatch: String,
  classementDB: String,
  logo: String,
  adversaire: String,
});
const SportSchema = new mongoose.Schema({
  nom: String,
  clubs: [ClubSchema],
});
module.exports = mongoose.model("sport", SportSchema);

and the back

getSportAdversaire: (req, res) => {
    Sport.findOne({ "clubs.nomClub": "Stade Rennais" }, (err, data) => {
      if (err) {
        console.log(err);
        res.json({ message: "une erreur s'est produite" });
      } else {
        res.json(data);
        console.log(data);
      }
    });
  },

Answer 1

You dont need to use the key as clubs.nomClub . You can simply use the key as nomClub . Your key name is nomClub and not clubs.nomClub .

sport.findOne({ "nomClub": "Stade Rennais" }, (err, data) => {
  if (err) {
    console.log(err);
    res.json({ message: "une erreur s'est produite" });
  } else {
    res.json(data);
    console.log(data);
  }
});