On Sun, 2011-01-09 at 23:12 -0500, Chris McDonough wrote:
> On Sun, 2011-01-09 at 16:25 -0800, lost_rat wrote:
> > Branching from within view_handler
> >
> > from pyramid.response import Response
> > from pyramid.httpexceptions import HTTPRedirection
> > from pyramid.httpexceptions import HTTPFound
> > class MyViewHandler(object):
> > __autoexpose__ = None
> > def __init__(self, request):
> > self.request = request
> > @action(renderer='/index.mako')
> > def index(self):
> > if test():
> > return {}
> > elif test2():
> > return Response('good stuff')
> > elif test3():
> > return HTTPRedirection(location='http://localhost/index3')
> > else:
> > return HTTPFound(location='http://localhost/index4')
> >
> >
> > In Pylons I could conditionally branch based on GET versus POST, where
> > the URL would be identical. I would transform the data from a POST
> > into a modified URL and redirect. I can't seem to accomplish the same
> > thing here within Pyramid.
> >
> > The Response works, but not HTTPRedirection or HTTPFound.
>
> You have a number of problems here.
>
> First, HTTPRedirection is not a response object that will behave in any
> sensible way; it's a base class for both HTTPFound and HTTPSeeOther, or
> HTTPMovedPermanently which are the "right" classes to use in user code.
>
> You say that HTTPFound "doesn't work", but I suspect it does, and your
> code is not reaching it somehow.
>
> All that said, rather than branch within a single action method, you can
> use view predicates to break the branches into separate methods. If
> test(), test2() and test3() are notational proxies for checking the
> request method above (say, test() means request_method=='GET', test2()
> is request_method=='POST' and test3() is request_method=='HEAD', the
> following code would be more Pyramidic:
>
> from pyramid.response import Response
> from pyramid.httpexceptions import HTTPRedirection
> from pyramid.httpexceptions import HTTPFound
>
> class MyViewHandler(object):
>
> __autoexpose__ = None
>
> def __init__(self, request):
> self.request = request
>
> @action(renderer='/index.mako', request_method='GET')
> def index_GET(self):
> return {}
>
> @action(request_method='POST')
> def index_POST(self):
> return Response('good stuff')
>
> @action(request_method='HEAD')
> def index_HEAD(self):
> return HTTPRedirection(location='http://localhost/index3')
>
> @action()
> def index_OTHER(self):
> return HTTPFound(location='http://localhost/index4')
>
> There are predicates other than "request_method" usable in view
> configuration decorators like view_config and action (see
> http://docs.pylonshq.com/pyramid/dev/narr/viewconfig.html#predicate-arguments).
> You can even create your own predicates by using "custom_predicates".
>
> Of course you can still do it the single-view-with-branching way, you
> just need to get your return values correct.
>
> See also http://plope.com/weird_pyramid_urldispatch
Forgot to specify a "name" for each action so they'll all be accessible
as '/foo/index' when the pattern is '/foo/{action}':
from pyramid.response import Response
from pyramid.httpexceptions import HTTPRedirection
from pyramid.httpexceptions import HTTPFound
class MyViewHandler(object):
__autoexpose__ = None
def __init__(self, request):
self.request = request
@action(name='index', renderer='/index.mako', request_method='GET')
def index_GET(self):
return {}
@action(name='index', request_method='POST')
def index_POST(self):
return Response('good stuff')
@action(name='index', request_method='HEAD')
def index_HEAD(self):
return HTTPRedirection(location='http://localhost/index3')
@action(name='index')
def index_OTHER(self):
return HTTPFound(location='http://localhost/index4')
>
> - C
>
>
>
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