How to write if-condition in Haml?

Question

How to write if and if-else statements in Haml for a Ruby on Rails application?

Answer 1

In haml, use the - (dash) to indicate a line is Ruby code. Furthermore, indention level indicates block level. Combine the two for if/else statements.

- if signed_in?
  %li= link_to "Sign out", sign_out_path
- else
  %li= link_to "Sign in", sign_in_path

is the same as the following code in ERB:

<% if signed_in? %>
  
<%= link_to "Sign out", sign_out_path %>
<% else %>
  
<%= link_to "Sign in", sign_in_path %>
<% end %>