Created
January 3, 2013 05:10
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PredicateProcessView which call method in considering of value returned by `predicate`. The returned value is True, PredicateProcessView calles corresponding method named `receiver`. You can set this `receiver` and `predicate` to `dispatch_config`.
Watch PonyView for usage.
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from django.views.generic import View | |
from django.http.response import HttpResponse | |
class RequestParamPredicate(object): | |
def __init__(self, val): | |
k = val | |
v = None | |
if '=' in val: | |
k, v = val.split('=', 1) | |
k, v = k.strip(), v.strip() | |
self.k = k | |
self.v = v | |
def __call__(self, request, *args, **kwargs): | |
params = getattr(request, request.method) | |
actual = params.get(self.k) | |
if actual is None: | |
return False | |
if self.v is not None and actual != self.v: | |
return False | |
return True | |
def secure_predicate(): | |
def _secure_predicate(request, *args, **kwargs): | |
return request.is_secure() | |
return _secure_predicate | |
class PredicateProcessView(View): | |
dispatch_config = {} | |
def get(self, request, *args, **kwargs): | |
self.dispatch_config | |
for custom_receiver, predicate in self.dispatch_config.items(): | |
if predicate(request, *args, **kwargs): | |
handler = getattr(self, custom_receiver) | |
break | |
else: | |
handler = getattr(self, 'get_default', self.http_method_not_allowed) | |
return handler(request, *args, **kwargs) | |
class PonyView(PredicateProcessView): | |
dispatch_config = {'get_corn': RequestParamPredicate('corn'), | |
'get_corn_1': RequestParamPredicate('corn=1'), | |
'get_secure': secure_predicate(), | |
} | |
def get_corn(self, request, *args, **kwargs): | |
return HttpResponse('pony with some corn') | |
def get_corn_1(self, request, *args, **kwargs): | |
return HttpResponse('pony with unicorn') | |
def get_secure(self, request, *args, **kwargs): | |
return HttpResponse('pony with protection') | |
def get_default(self, request, *args, **kwargs): | |
return HttpResponse('pony') |
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