I encountered the following error while using Haml in Ruby on Rails.

■ Error Message

syntax error, unexpected keyword_ensure, expecting keyword_end

The cause was that I wrote the code inside if statement branches without proper indentation, as shown below.

I wanted to align %ul.nav with the same indentation, so I wrote it like this, but this was wrong.

%div.container.nav-collapse
  %ul.nav
    %li #{ link_to "Article", "/articles" }
  - if user_signed_in?
  %ul.nav
    %li #{ link_to "Signed in as #{ current_user.email }", "#" }
  %ul.nav
    %li #{ link_to "Sign out", destroy_user_session_path, :method => :delete }
  - else
  %ul.nav
    %li #{ link_to "Sign up", new_user_registration_path }
  %ul.nav
    %li #{ link_to "Sign in", new_user_session_path }

The correct way is to write it as follows:

%div.container.nav-collapse
  %ul.nav
    %li #{ link_to "Article", "/articles" }
  - if user_signed_in?
    %ul.nav
      %li #{ link_to "Signed in as #{ current_user.email }", "#" }
    %ul.nav
      %li #{ link_to "Sign out", destroy_user_session_path, :method => :delete }
  - else
    %ul.nav
      %li #{ link_to "Sign up", new_user_registration_path }
    %ul.nav
      %li #{ link_to "Sign in", new_user_session_path }

From the middle, the indentation of %ul.nav drops one level and looks awkward, but in the output HTML, they are beautifully aligned at the same indentation level, so I was relieved.

That’s all from the Gemba.