Re: Question about generating urls with dispatch-rules from imported modules

Oops, small correction:

> The x-expressions need to include hyperlinks to urls
> defined via dispatch-rules in main.rkt, i.e., call the url-generating
> function.

Should be `routing.rkt` instead of `main.rkt`.

--
Yury Bulka
https://mamot.fr/@setthemfree
#NotOnFacebook



Yury Bulka <setthemfree-tGttlkr9q/[email protected]> writes:

> Dear Racket community,
>
> First of all I want to say hello since this is my first post here.
>
> I have a question about using the url dispatch library:
> https://docs.racket-lang.org/web-server/dispatch.html
>
> More specifically about the url-generation function in the context of
> inter-module dependencies.
>
> Let's say in `routing.rkt` I define some request handlers and then map
> them to urls using dispatch-rules.
>
> The request handlers call functions from another module that are
> responsible for generating the x-expressions (let's call this module
> `templates.rkt`). The x-expressions need to include hyperlinks to urls
> defined via dispatch-rules in main.rkt, i.e., call the url-generating
> function.
>
> The url-generating function, in turn, needs to be provided the request
> handler as the first argument.
>
> That means that the xexpr-generating function needs to have access to
> the url-generating function and all the request handlers it might
> need to include hyperlinks to, or it may need to be provided with all
> the generated urls in advance.
>
> Something like this wouldn't work if render-post needed to generate a url:
>
> ;; A request handler associated with a url
> (define (single-post-view request post-id)
>   (response/xexpr (render-post (post-id))) ;; render-post is in another file/module
>
> I wouldn't want to make templates.rkt require routing.rkt (I'm not sure
> this is technically possible to have modules depend on each other like
> that), nor would I want to provide all the request handlers as arguments
> to `render-post`. I also thought about putting the url-generating
> function into a parameter, but `render-post` also needs access to the
> request handlers.
>
> What approach should I take?
>
> --
> Yury Bulka
> https://mamot.fr/@setthemfree
> #NotOnFacebook

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