code: function create(req, res, next) {
    res.__apiMethod = 'create';
    const self = this;
    const readonly = this.option('create', 'readonly');
    const method = this.option('create', 'method');
    let data = (method !== 'get') ? req.body : req.query;
    if (readonly) {
      try {
        data = helpers.validateReadonly(
          helpers.flat(data),
          readonly
        );
      } catch(e) {
        return next(e)
      }
    }
    const obj = new (this.model)(data);
    obj.save(function (err) {
      if (err) {
        if (err.name && err.name == "ValidationError") {
          return next(new ModelAPIError(422, err));
        }
        return next(err);
      }
      req.params.id = obj._id;
      res.status(201);
      return findById.call(self, 'create', req, res, next);
    });
  }
docs: create - the controller that creates a model instance
  if instance is creared successfully this controller calls findById controller
  
  @param  {express.Request}  req        the http(s) request
  @param  {express.Response} res        the http(s) response
  @param  {Function}         next       the callback should be called if controller fails
  
  @throws ModelAPIError(406, '...')
  @throws ModelAPIError(422, '...')
  
  @memberof ModelAPIRouter