code: function (params) {
      var res = [];
      if (typeof (params) === 'undefined') params = { displayEverything: false };
      if (!this.registeredModels || Object.keys(this.registeredModels).length === 0) {
        res.push('There is no registered models');
      } else {
        res.push('List of registered models');
        for (var modelName in this.registeredModels) {
          res.push('  - ' + modelName);
          if (params.displayEverything) {
            for (var key in this.registeredModels[modelName]) {
              res.push('      ' + key + ' : ' + this.registeredModels[modelName][key].type);
            }
          }
        }
      }
  
      return res.join('\n');
    }
docs: Show information of registered models. All registered models are stored in .registeredModels If params.displayEverything is true, module will show additional info