Re: [Cppcms-users] URL dispatching help

[Troy W. <dr...@gm...>]

Thank you all very much. It's now clear to me what URL mapping is and the
problem it solves!


On Tue, May 7, 2013 at 4:37 PM, Artyom Beilis <art...@ya...> wrote:

> none of those in my code, or any other call to mapper(), yet the
> application seems to work so far!
> >
> >
> >Perhaps the problem is that I'm generating all the HTML code in CppCMS
> templates and none in C++ functions. Is URL mapping relevant if I'm only
> using templates to output HTML? I assume it is, because the documentation
> states:
> >    Such system allows using "url" tag in templates system easily as"
> >
> >    <a href="<% url "/news/article" using article id %>" >...</a>
> >
> >
> >
> >But I've been using something like:
> >    <a href="/news/<%= article.id %>">...</a>
> >
> >
> >Which appears to work fine. I'm presuming there's some problem in my
> usage that URL mapping solves?
> >
>
> Now this is actually a question that is relevant...
>
>
> I'll explain - lets see some examples
>
> Consider you are developing a generic application that can be installed in
> different location. For example:
>
> www.website.com/coolnews/news/10
> www.website.com/my/news/10
> www.website.com/news/10
>
> Consider you need to have some generic options in URL like language for
> example
>
> www.website.com/my/news/ru/10
> www.website.com/my/news/en/10
>
> Now your URL generation becomes
>
>
>    <a href="<%= root_url %>/news/<%= lang %>/<%= article.id %>" > ...</a>
>
> More than that, consider you have URL like
>
>     /wiki/this%20my%20title
>
> i.e. you have native text than it should be
>
>    <a href="<%= root_url %>/news/<%= lang %>/<%= article.id | urlencode
> %>" > ...</a>
>
> Now put it in every possible corner - not easy.
>
> So, this what url mapping you solves - it provide easy, generic and
> abstract way to generate URLs such that
>
> 1. You can change them easily and actual URL format is located in one
> place not all over the code
> 2. You can manipulate various different properties globally (locale/root
> etc)
> 3. The default filter is URL encode and not HTML escape that suites URL
> generation much better.
>
>
>
>
> In my first applications I used the approach you had started with but it
> becomes much harder
> to maintain - that is why url mapper was developed.
>
>
> Artyom Beilis
> --------------
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> CppDB - C++ SQL Connectivity: http://cppcms.com/sql/cppdb/
>
>
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