PrepareParams per-component basis?

[alexhawkins]

When using named components, is it possible to define prepareParams on a per-component basis? I'd like to be able to do this:

<Route
   path="shop/product/:name"
   component={ProductDetailsMain}>
   <IndexRoute
      components={{
          impactHero: ImpactHero,
          nextPrevButtons: NextPrevButtons,
          productInfo: ProductInfo,
          productReviews: ProductReviews,
          relatedProducts: RelatedProducts,
        }}
     prepareParams={{
          relatedProducts={prepareRelatedProductsParams}>
     }}
     queries={{
          impactHero: ViewerQuery,
          nextPrevButtons: ViewerQuery,
          productInfo: ViewerQuery,
          productReviews: ViewerQuery,
          relatedProducts: ViewerQuery,
      }}
      render={{
          productInfo: ({ props }) => props ? <ProductInfo {...props} /> : <NamedRouteLoader/>,
      }}
    />
</Route>

instead of this

<Route
   path="shop/product/:name"
   component={ProductDetailsMain}
   prepareParams={prepareRelatedProductsParams}>
   <IndexRoute
      components={{
          impactHero: ImpactHero,
          nextPrevButtons: NextPrevButtons,
          productInfo: ProductInfo,
          productReviews: ProductReviews,
          relatedProducts: RelatedProducts,
        }}
     queries={{
          impactHero: ViewerQuery,
          nextPrevButtons: ViewerQuery,
          productInfo: ViewerQuery,
          productReviews: ViewerQuery,
          relatedProducts: ViewerQuery,
      }}
      render={{
          productInfo: ({ props }) => props ? <ProductInfo {...props} /> : <NamedRouteLoader/>,
      }}
    />
</Route>

[alexhawkins]

I need access to router state otherwise i would use prepareParams on the needed Relay query.

[taion]

This isn't possible or more to the point, isn't going to do what you want even if it were – the query aggregation used here means that each param used in all queries must have the same value for all routes.