Question

I m starting with webapp2. My english is not very good, so i ll use an example to explain my problem: Suppose i m building an application that will handle cars information.

I ve these handlers:

ViewHandler: will display a view for a single car, with all of its information (engine, year, brand, model, etc..)
ListHandler: will display all the cars in the application, with a link to the view page.

问题是,我能够建立这种联系,与单一观点联系起来。

我可以在模板中这样做:

<ul> 
  <li><a href= /cars/view/{{car.id}} >{{car.model}}</a></li> 
</ul>

but don t like that (where s the DRY principle after all?) I was wondering if there s some way to do it similar to django, resolving the URL in the template, like this:

<ul> 
  <li><a href= {% url cars.view car.id} >{{car.model}}</a></li> 
</ul>

Maybe it s not in the template. I ve tryed webapp2.url_for() but didn t help.

感谢很多!

Answer 1

webapp2.uri_for() is your best bet, but you must use it in combination with named routing. You can read more about webapp2 routing in combination with uri_for here: http://webapp-improved.appspot.com/guide/routing.html

Here s an example from the above article of how it might look:

app = webapp2.WSGIApplication([
    webapp2.Route( / , handler= handlers.HomeHandler , name= home ),
    webapp2.Route( /wiki , handler=WikiHandler, name= wiki ),
    webapp2.Route( /wiki/<page> , handler=WikiHandler, name= wiki-page ),
])

# /
uri = uri_for( home )

# http://localhost:8080/
uri = uri_for( home , _full=True)

# /wiki
uri = uri_for( wiki )

# http://localhost:8080/wiki
uri = uri_for( wiki , _full=True)

# http://localhost:8080/wiki#my-heading
uri = uri_for( wiki , _full=True, _fragment= my-heading )

# /wiki/my-first-page
uri = uri_for( wiki-page , page= my-first-page )

# /wiki/my-first-page?format=atom
uri = uri_for( wiki-page , page= my-first-page , format= atom )

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