code: function mapInputType(model) {
      const modelName = `${model.modelName}Input`;
  
      types[modelName] = {
          generated: false,
          name: modelName,
          meta: {
              category: 'TYPE',
              input: true,
              fields: {}
          }
      };
  
      _.forEach(model.definition.properties, (property, key) => {
          mapProperty(model, property, modelName, key, true);
      });
  }
docs: Generates a definition for a single model input type
  @param {*} model