RedirectUrl instances for subsites

[James Parker]

Hi,

I have multiple subsites that I'm currently upgrading to Yesod 1.6. It looks like I need to define `RedirectUrl` instances for the subsites since the subsites have redirects (ex `redirect MySubsitePageR`). I was attempting to define the instance once using `getRouteToParent`, but get ambiguity check errors (probably due to the type families not being injective). Is there a way to define a general `RedirectUrl` for all subsites?

instance (SubHandlerSite m ~ app, HandlerSite m ~ master) => RedirectUrl master (Route app) where
    toTextUrl r = do
      f <- getRouteToParent
      toTextUrl $ f r

Thanks,

James

[Michael Snoyman]

I've never done it this way, since it precludes having multiple copies of the same subsite in a single application. I've always explicitly added the appropriate master site route data constructor around the subsite route I'm trying to redirect to.

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[James Parker]

Ah interesting. I never considered having multiple copies of the same subsite.

Is there a way for the parent site not to have to define a `RedirectUrl` instance for each subsite? I'm trying to redirect to a route within the same subsite. I currently have something like the following:

getMySubsiteHandlerR :: SubHandlerFor MySubsite master Html

getMySubsiteHandlerR = redirect MySubsitePageR

[Michael Snoyman]

That's what I meant by the data constructor from the master site. If you have a routes file with something like:

/foo FooR Foo getFoo

And a Foo subsite with a route BarR, you can use `redirect $ FooR BarR`.

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