whole_func_string: function (modMeth, filter, cb = (err, val, cb) => cb()) {
        this.promises.push( new Promise((resolve, reject) => {
          modMeth(...filter, (err, val) => {
            cb(err, val, resolve);
          });
        }));
      }
func_code_string: function (modMeth, filter, cb = (err, val, cb) => cb()) {
        this.promises.push( new Promise((resolve, reject) => {
          modMeth(...filter, (err, val) => {
            cb(err, val, resolve);
          });
        }));
      }
func_documentation_string: eval and other code call this to run a model method then cb