ruby on rails - Routing Resources Doesn't Set up Routing Properly -

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normally expect resources set routes where

/groups/:id

however, when call rake routes get

get    /groups(.:format) groups#show

also, whenever use view helper method groups_path(group.id) provides url link as

/groups.1

finally in routing file

resource :groups

this case edit, update, , destroy actions well. finally, doesn't produce index action. have create after write resources method. what's wrong , how fix this?

pluralize resource:

resources :groups

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