The story that link_to is deep (cause unknown)

When writing with ** link_to ** so that when you press the post button during application development, you will be taken to the post page

  <%= link_to "Post", 'new_photo_path'%>

At first, I wrote it like this. Then always I got this red error. ..

Assumption

** routes.rb ** is not well described Spelled wrong

I came to check routes.rb

routes.rb

resources :photos, except: :index
  root to: 'photos#index'

There is nothing strange other than excluding index in resources

rails routes

There is no problem even if you check with ...

I didn't misspell it ...

What went

** Described Controller # Action instead of Prefix ** new_photo GET /photos/new(.:format)

index.html.erb

<%= link_to "Post", '/photos/new'%>

Solved with ...

add to

The cause was found in the comment from @scivola Thank you @scivola. Prefix seems to be a ** string ** if you enclose it in '' ... So in my case it seems to be recognized as a character string