Rails routes error troubleshooting

Question

I'm getting a weird error when I try to link to the show_members action

Routing Error
No route matches "/groups/1/show_members"

#routes.rb
get 'groups/:id/members' => 'groups#show_members'

#groups_controller.rb
def show_members

When I run rake routes I get this:

#rake routes
            groups GET    /groups(.:format)           {:controller=>"groups", :action=>"index"}
            groups POST   /groups(.:format)           {:controller=>"groups", :action=>"create"}
         new_group GET    /groups/new(.:format)       {:controller=>"groups", :action=>"new"}
        edit_group GET    /groups/:id/edit(.:format)  {:controller=>"groups", :action=>"edit"}
             group GET    /groups/:id(.:format)       {:controller=>"groups", :action=>"show"}
             group PUT    /groups/:id(.:format)       {:controller=>"groups", :action=>"update"}
             group DELETE /groups/:id(.:format)       {:controller=>"groups", :action=>"destroy"}
        group_join GET    /groups/join(.:format)       {:controller=>"groups", :action=>"join"}
 group_remove_user PUT    /groups/remove_user(.:format){:controller=>"groups", :action=>"remove_user"}
                   GET    /groups/:id/members(.:format){:controller=>"groups", :action=>"show_members"}

UPDATE: But all I want the show_members action to do is show all the users within that group. I want the user functionality and paths to remain the same. And now the show_members action routes to group, the same as show. In my groups controller, I split the default show group action into three pages, one for the group profile which is show, one for the members in that group which goes to show_members, and one for the news page, which will go to show_news when i get to it.

#groups_controller.rb
def show_members
  @group = Group.find(params[:id])
  @members = @group.users
  @group_admin = User.find(@group.group_admin)
  respond_to do |format|
    format.html # show.html.erb
    format.xml  { render :xml => @group }
  end
end

#rake routes
group_join GET    /groups/:group_id/join(.:format) {:controller=>"groups", :action=>"join"}
group_remove_user PUT    /groups/:group_id/remove_user(.:format) {:controller=>"groups", :action=>"remove_user"}
group GET    /groups/:group_id/:id/members(.:format) {:controller=>"groups", :action=>"show_members"}
group_users GET    /groups/:group_id/users(.:format) {:controller=>"users", :action=>"index"}
group_user GET    /groups/:group_id/users/:id(.:format) {:controller=>"users", :action=>"show"}
I WANT THIS new_user_session GET    /users/sign_in(.:format) {:controller=>"devise/sessions", :action=>"new"}
INSTEAD OF THIS new_user_group_session GET    /users/groups/:group_id/sign_in(.:format)          {:controller=>"devise/sessions", :action=>"new"}
user_group_session POST   /users/groups/:group_id/sign_in(.:format)          {:controller=>"devise/sessions", :action=>"create"}
destroy_user_group_session GET    /users/groups/:group_id/sign_out(.:format)         {:controller=>"devise/sessions", :action=>"destroy"}
user_group_password POST   /users/groups/:group_id/password(.:format)         {:controller=>"devise/passwords", :action=>"create"}
new_user_group_password GET    /users/groups/:group_id/password/new(.:format)     {:controller=>"devise/passwords", :action=>"new"}
edit_user_group_password GET    /users/groups/:group_id/password/edit(.:format)    {:controller=>"devise/passwords", :action=>"edit"}
user_group_password PUT    /users/groups/:group_id/password(.:format)         {:controller=>"devise/passwords", :action=>"update"}
user_group_registration POST   /users/groups/:group_id(.:format)                  {:controller=>"users/registrations", :action=>"create"}

new_user_group_registration GET /users/groups/:group_id/sign_up(.:format) {:controller=>"users/registrations", :action=>"new"} edit_user_group_registration GET /users/groups/:group_id/edit(.:format) {:controller=>"users/registrations", :action=>"edit"} user_group_registration PUT /users/groups/:group_id(.:format) {:controller=>"users/registrations", :action=>"update"} user_group_registration DELETE /users/groups/:group_id(.:format) {:controller=>"users/registrations", :action=>"destroy"} user_group_confirmation POST /users/groups/:group_id/confirmation(.:format) {:controller=>"devise/confirmations", :action=>"create"} new_user_group_confirmation GET /users/groups/:group_id/confirmation/new(.:format) {:controller=>"devise/confirmations", :action=>"new"} user_group_confirmation GET /users/groups/:group_id/confirmation(.:format) {:controller=>"devise/confirmations", :action=>"show"} groups GET /groups(.:format) {:controller=>"groups", :action=>"index"} groups POST /groups(.:format) {:controller=>"groups", :action=>"create"} new_group GET /groups/new(.:format) {:controller=>"groups", :action=>"new"} edit_group GET /groups/:id/edit(.:format) {:controller=>"groups", :action=>"edit"} group GET /groups/:id(.:format) {:controller=>"groups", :action=>"show"} group PUT /groups/:id(.:format) {:controller=>"groups", :action=>"update"} group DELETE /groups/:id(.:format) {:controller=>"groups", :action=>"destroy"}

#routes.rb
resources :groups do
  get 'join' => 'groups#join'
  put 'remove_user' => 'groups#remove_user'
  get ':id/members' => 'groups#show_members'
  resources :users, :only => [:index, :show]
  devise_for :users, :controllers => { :registrations => "users/registrations" }
end

Answer 1

Rails is correct when it says that no route matches /groups/1/show_members - your routes.rb is creating a route for something like /groups/1/members (without the "show_")

You'll need to change routes.rb to look like:

get 'groups/:id/show_members` => 'groups#show_members'

Answer 2

Well the problem is of course you haven't done everything right.

resources :groups do |group|
  group.resources :members
end

link_to @member.name, [@group, @member]

Magic.

Now reading the guide would be a very good idea.

http://guides.rubyonrails.org/routing.html