Re: [Cppcms-users] What exactly url_mapper does?

[Artyom B. <art...@ya...>]

URL Mapper allows overloading the functions.

For example you may call

   url("/my/app",category_id)

and

   url("/my/app",category_id,page_no)

That are mapped as

  map.assign("/app","/article/{1}")

  map.assign("/app","/article/{1}/page/{2}")

In the case of main form page it just overloads the
cases where the URL represents the latest comments
or comments with paging.


flat_thread::flat_thread(cppcms::service &s) : 
thread_shared(s)
{
    dispatcher().assign(".*",&flat_thread::prepare,this,0);
    mapper().assign("{1}");
}


Means that prepare function would receive as first parameter the 0
regular expression group on selection (Everything) and
for mapping it would convert its parameter to its representation

as is.


Most important take a look on how URLs are used in templates

forums.tmpl:    <form action="<% url "/forums" %>" method="post" >
forums.tmpl:    <a href="<% url "/forums" using next %>"><% gt "Next Page" %></a>

This is mapping of "forums" application with 0 or 1 parameter.

And this is how thread applications mapping is used:

thread.tmpl:        <a href="<% url "/flat_thread" using thread_id %>"><% gt "Flat View"%></a>
thread.tmpl:        | <a href="<% url "/tree_thread" using thread_id %>"><% gt "Tree View" %></a>
Regards,
 

Artyom Beilis



>________________________________
>From: Abhishek Kaushik <abh...@gm...>
>To: cpp...@li...
>Sent: Sunday, August 7, 2011 4:35 PM
>Subject: Re: [Cppcms-users] What exactly url_mapper does?
>
>Hi, 
>
>Could you please explain me these differences regarding 
>the message board example application?:
>
>forums::forums(cppcms::service &srv) : 
>master(srv)
>{
>    dispatcher().assign(".*",&forums::prepare,this,0);
>    mapper().assign("{1}"); // with id
>    mapper().assign("");    // default
>}
>
>AND
>
>flat_thread::flat_thread(cppcms::service &s) : 
>thread_shared(s)
>{
>    dispatcher().assign(".*",&flat_thread::prepare,this,0);
>    mapper().assign("{1}");
>}
>
>
>I have referred the doxygen documentation, but still failed to make out much
>meaning regarding this particular problem.
>
>could you tell me as to why in forums constructor it was possible to have 2
>mapper().assign() one for "" and other for "{1}"
>
>whereas, in flat_thread, it has only 1 mapper().assign() statement 
>and thats "{1}".
>
>What conditions tell us that it would require 2 or 1 assign statements?
>
>I fully understand the dispatcher but this mapper, I am unable to.
>
>Hope you understand my problem. Please let me know if I am missing 
>the basics of anything, i will refer it.
>
>Thanks in advance for your reply.
>
>
>
>
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