server/models/helpers/component-from-model.js
function (modMeth, filter, cb = (err, val, cb) => cb()) {
      this.promises.push( new Promise((resolve, reject) => {
        modMeth(...filter, (err, val) => {
          cb(err, val, resolve);
        });
      }));
    }
function (modMeth, filter, cb = (err, val, cb) => cb()) {
      this.promises.push( new Promise((resolve, reject) => {
        modMeth(...filter, (err, val) => {
          cb(err, val, resolve);
        });
      }));
    }
eval and other code call this to run a model method then cb