diff --git a/rest_framework/routers.py b/rest_framework/routers.py
index 027a78cc13..70a1149ab4 100644
--- a/rest_framework/routers.py
+++ b/rest_framework/routers.py
@@ -144,7 +144,9 @@ def get_routes(self, viewset):
Returns a list of the Route namedtuple.
"""
- known_actions = flatten([route.mapping.values() for route in self.routes if isinstance(route, Route)])
+ # converting to list as iterables are good for one pass, known host needs to be checked again and again for
+ # different functions.
+ known_actions = list(flatten([route.mapping.values() for route in self.routes if isinstance(route, Route)]))
# Determine any `@detail_route` or `@list_route` decorated methods on the viewset
detail_routes = []
@@ -154,6 +156,7 @@ def get_routes(self, viewset):
httpmethods = getattr(attr, 'bind_to_methods', None)
detail = getattr(attr, 'detail', True)
if httpmethods:
+ # checking method names against the known actions list
if methodname in known_actions:
raise ImproperlyConfigured('Cannot use @detail_route or @list_route '
'decorators on method "%s" '
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