ruby - undefined local variable or method `welcome_goodbye_path' in Rails? -

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i beginner in rails , trying learn using "agile web development using rails".i wanted create link webpage.this code:

<h1>hello, rails!</h1> <p> <%= time.now %> </p> <p> time <%= link_to "goodbye", welcome_goodbye_path %>! </p>

but gives error...

undefined local variable or method `welcome_goodbye_path'

what doing wrong ? code of welcome controller:

class welcomecontroller < applicationcontroller   def index   end   def goodbye   end end

this result of rake routes:

        prefix verb   uri pattern                  controller#action      articles    /articles(.:format)          articles#index               post   /articles(.:format)          articles#create   new_article    /articles/new(.:format)      articles#new  edit_article    /articles/:id/edit(.:format) articles#edit       article    /articles/:id(.:format)      articles#show               patch  /articles/:id(.:format)      articles#update               put    /articles/:id(.:format)      articles#update               delete /articles/:id(.:format)      articles#destroy welcome_index    /welcome(.:format)           welcome#index               post   /welcome(.:format)           welcome#create   new_welcome    /welcome/new(.:format)       welcome#new  edit_welcome    /welcome/:id/edit(.:format)  welcome#edit       welcome    /welcome/:id(.:format)       welcome#show               patch  /welcome/:id(.:format)       welcome#update               put    /welcome/:id(.:format)       welcome#update               delete /welcome/:id(.:format)       welcome#destroy          root    /

you'd have show config/routes.rb. need in there like:

get 'goodbye', to: 'welcome#goodbye', as: 'welcome_goodbye'

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