immutable reducer

index.es6

switch (action.type) {
 case ADD_NEW_AVAILABLE_COLOR_TO_CAR:{
  const { color, model, manufacturer } = action.payload
  return {...state, manufacturer: {
    ...state.manufacturer, [manufacturer]:
    {...state.manufacturers[manufacturers], models:
      {...state.manufacturers[manufacturers].models, [model]:
        {...state.manufacturers[manufacturers].models[model], options:
          {...state.manufacturers[manufacturers].models[model].options, colors:
          {...state.manufacturers[manufacturers].models[model].options.colors, [color]: true}
         }
       }
     }
   }
 }
 default: return state
}