populate-of-populated.js

// example with Alina Z.
Act.find()
        
        .then(allSuggestedActs => {
     
          const user = new User({
            fullName,
            email,
            encryptedPassword,
            score: 0,
            suggestedActs: []
          });
          allSuggestedActs.forEach(oneAct => {
    		user.suggestedActs.push(oneAct._id);
          });
        
          user
            .save()
            .then(updatedUserSuggestedActs => {
              User.findById(updatedUserSuggestedActs._id)
                .populate({
                  path: "suggestedActs",
                  populate: {
                    path: "category",
                    model: "Category"
                  }
                })
                .then(populatedUser =>
                  req.login(populatedUser, err => {
                    if (err) {
                      console.log(
                        "error when logging in after sign up *************** ",
                        err
                      );
                     
                      console.log("something before the return");

                      return;
                    }

                    res.json({ populatedUser });
                    return;
                  })
                )
                .catch();
             })
            .catch(err => res.status(400).json(err));
        })
        .catch(
          err =>
            console.log(
              "error while creating array of suggested Acts in  User signup route ",
              err
            )
        
        );
    })
    .catch(err => res.status(400).json(err)); // close User.findOne()
});