pregenerator_example.py

from wsgiref.simple_server import make_server
from pyramid.config import Configurator
from pyramid.httpexceptions import HTTPFound

def show_popular(request):
    pageno_s = request.matchdict['pageno']
    if pageno_s == '':
        pageno_s = '1'
    pageno = int(pageno_s)
    if pageno < 1:
        return HTTPFound(request.route_path('popular', pageno=1))
    retval = {
        'pageno': pageno,
        'next': request.route_url('popular', pageno=pageno+1)
    }
    if pageno > 1:
        retval['prev'] = request.route_url('popular', pageno=pageno-1)
    return retval

def popular_pregenerator(request, elements, kw):
    if kw['pageno'] == 1:
        kw['pageno'] = ''
    return elements, kw

if __name__ == '__main__':
    config = Configurator()
    config.add_route('popular', '/popular/{pageno:\d*}', pregenerator=popular_pregenerator)
    config.add_view(show_popular, route_name='popular', renderer='json')
    app = config.make_wsgi_app()
    server = make_server('0.0.0.0', 8080, app)
    server.serve_forever()