mongoose unshift array code example

Example 1: array schema mongoose

const ToySchema = new Schema({ name: String });
const ToyBoxSchema = new Schema({
  toys: [ToySchema],
  buffers: [Buffer],
  strings: [String],
  numbers: [Number]
  // ... etc
});

Example 2: how to delete popultate subdocument mongoose

exports.feed = function (req, res) {
  var userIds = req.user.friends;

  Surf
    .find({user_id: {$in: userIds}})
    .populate('user_id', 'name boards') // added boards
    .populate('friends', 'name')
    // .populate('board_id', 'name size') // can't do this as discussed
    .exec(function (err, surfs) {
      if (err) {
        return handleError(res, err);
      }

      surfs.forEach(function (surf) {
        surf.boardInfo = surf.user_id.boards.id(surf.board_id)
      });
      // TODO: now remove the surf.user_id.boards.
      return res.json(200, surfs);
    });

};