Re: [Cppcms-users] URL dispatching help
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Re: [Cppcms-users] URL dispatching help
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From: Petr J. <ele...@ex...> - 2013-05-03 10:36:11
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One way to use the url_mapper class is when using
http_response::set_redirect_header() function.
In combination with the url() function you can easily translate a single
name/key to a longer url.
Such as: set_response_header(url("my_key", "argument"))
Which depending on the value mapped to my_key might get translated to
something like "/some/url/with/'argument'"
On 3/05/2013 6:40 PM, Troy Watson wrote:
> <digression>
> > 1. Read the docs.
> I have read both the tutorials online and the API documentation generated
> by Doxygen. The documentation is riddled with spelling
> and grammatical errors making it difficult for me to comprehend in some
> places.
>
> > 2. Read existing code and examples.
> You must have missed earlier where I mentioned reading the examples and
> looking through the code and not understanding the concept or use of the
> url_mapper class! That's why I'm here asking people who do understand it,
> hoping they can share some knowledge! The help so far is VERY appreciated.
> :)
>
> > It is a walk in park if you already know C++...
> I do.
>
> > ... and some basic web programming.
> I don't. The documentation fails to educate a person new to web
> development, like me.
> </digression>
>
> Anyway, back on topic:
> I think I'm not understanding HOW to use the url_mapper class because I
> don't understand WHY I would need to or should. What problem does it solve?
> Like I said above, I'm new to web programming. In a project larger than
> CppBlog and WikiPP I'm not using the URL mapping functions anywhere, which
> leads me to believe that either it's useless or, more likely, I'm doing
> something wrong! :)
>
> According to a simple "grep -R mapper()", the url_mapper member of the
> application class is referred to 52 times in all the examples code and
> WikiPP and CppBlog code. Of those 52 uses, only seven are not a call to
> mapper().assign(...). Five are to mapper().root(...) and the remaining two
> are for mapper().set_value(...). I use 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?
>
> Thank you all for being patient with me and helping where you can!
>
>
> On Fri, May 3, 2013 at 1:36 AM, Shiv Shankar Dayal <
> shi...@gm...> wrote:
>
>> Two things. 1. Read the docs. 2. Read existing code and examples. It is a
>> walk in park if you already know C++ and some basic web programming.
>>
>>
>> On Thu, May 2, 2013 at 9:04 PM, Shiv Shankar Dayal <
>> shi...@gm...> wrote:
>>
>>> look up examples directory in cppcms directory. you need cppdb for some
>>> apps. you can also install cppwiki and cppblog for more understanding. It
>>> is all there for you.
>>>
>>>
>>> On Thu, May 2, 2013 at 1:08 PM, Troy Watson <dr...@gm...> wrote:
>>>
>>>> Nope - still not getting it :(
>>>>
>>>> Perhaps if you can spare some time to show me with a real, practical
>>>> example I'll understand.
>>>>
>>>> I have the following line in my code: dispatcher().assign(
>>>> "/edit/(\\d+)", &application::edit_bookmark, this, 1 );
>>>> It correctly calls this function:
>>>>
>>>> void edit_bookmarks( std::string id )
>>>>
>>>> ...when I click links that look like /edit/10 or /edit/9239 etc.
>>>> Dispatching I understand.
>>>>
>>>> Where does mapping come into this? How can my application be improved
>>>> with a call to mapper(...)? How could it compliment the dispatcher as shown
>>>> above?
>>>>
>>>>
>>>>
>>>>
>>>> On Wed, May 1, 2013 at 12:59 AM, Shiv Shankar Dayal <
>>>> shi...@gm...> wrote:
>>>>
>>>>> It is simple actually. You click a link some function on server is
>>>>> invoked and output is displayed on another link. One is mapping another is
>>>>> dispatching.
>>>>>
>>>>>
>>>>> Best regards,
>>>>> Shiv
>>>>>
>>>>>
>>>>> On Tue, Apr 30, 2013 at 2:16 PM, Troy Watson <dr...@gm...> wrote:
>>>>>
>>>>>> I've read that page several times, messed about with the url_mapping
>>>>>> example, and it still makes no sense to me what you mean by "the opposite
>>>>>> of dispatching". I appreciate the help, but please explain it like I've
>>>>>> never written a webapp before... because I haven't!
>>>>>>
>>>>>>
>>>>>> On Mon, Apr 29, 2013 at 4:28 PM, Artyom Beilis <art...@ya...>wrote:
>>>>>>
>>>>>>>> What is mapper().assign( "...", "..." ) used for? All my URL
>>>>>>> dispatching seems to work by only calling
>>>>>>>> dispatcher().assign(...) to set up the URLs with a callback
>>>>>>> function.
>>>>>>>> What concept am I not understanding that would require the mapper()?
>>>>>>>
>>>>>>> The opposite of dispatching :-)
>>>>>>>
>>>>>>>
>>>>>>> See: http://cppcms.com/wikipp/en/page/cppcms_1x_tut_url_mapping
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> Artyom Beilis
>>>>>>> --------------
>>>>>>> CppCMS - C++ Web Framework: http://cppcms.com/
>>>>>>> CppDB - C++ SQL Connectivity: http://cppcms.com/sql/cppdb/
>>>>>>>
>>>>>>>
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>>>>>>> _______________________________________________
>>>>>>> Cppcms-users mailing list
>>>>>>> Cpp...@li...
>>>>>>> https://lists.sourceforge.net/lists/listinfo/cppcms-users
>>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> ------------------------------------------------------------------------------
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>>>>>> _______________________________________________
>>>>>> Cppcms-users mailing list
>>>>>> Cpp...@li...
>>>>>> https://lists.sourceforge.net/lists/listinfo/cppcms-users
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Best regards,
>>>>> Shiv Shankar Dayal
>>>>>
>>>>>
>>>>> ------------------------------------------------------------------------------
>>>>> Introducing AppDynamics Lite, a free troubleshooting tool for Java/.NET
>>>>> Get 100% visibility into your production application - at no cost.
>>>>> Code-level diagnostics for performance bottlenecks with <2% overhead
>>>>> Download for free and get started troubleshooting in minutes.
>>>>> http://p.sf.net/sfu/appdyn_d2d_ap1
>>>>> _______________________________________________
>>>>> Cppcms-users mailing list
>>>>> Cpp...@li...
>>>>> https://lists.sourceforge.net/lists/listinfo/cppcms-users
>>>>>
>>>>>
>>>>
>>>>
>>>> ------------------------------------------------------------------------------
>>>> Introducing AppDynamics Lite, a free troubleshooting tool for Java/.NET
>>>> Get 100% visibility into your production application - at no cost.
>>>> Code-level diagnostics for performance bottlenecks with <2% overhead
>>>> Download for free and get started troubleshooting in minutes.
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>>>> _______________________________________________
>>>> Cppcms-users mailing list
>>>> Cpp...@li...
>>>> https://lists.sourceforge.net/lists/listinfo/cppcms-users
>>>>
>>>>
>>>
>>>
>>> --
>>> Best regards,
>>> Shiv Shankar Dayal
>>>
>>
>>
>>
>> --
>> Best regards,
>> Shiv Shankar Dayal
>>
>>
>> ------------------------------------------------------------------------------
>> Introducing AppDynamics Lite, a free troubleshooting tool for Java/.NET
>> Get 100% visibility into your production application - at no cost.
>> Code-level diagnostics for performance bottlenecks with <2% overhead
>> Download for free and get started troubleshooting in minutes.
>> http://p.sf.net/sfu/appdyn_d2d_ap1
>> _______________________________________________
>> Cppcms-users mailing list
>> Cpp...@li...
>> https://lists.sourceforge.net/lists/listinfo/cppcms-users
>>
>>
>
>
>
> ------------------------------------------------------------------------------
> Get 100% visibility into Java/.NET code with AppDynamics Lite
> It's a free troubleshooting tool designed for production
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>
>
>
> _______________________________________________
> Cppcms-users mailing list
> Cpp...@li...
> https://lists.sourceforge.net/lists/listinfo/cppcms-users
>
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