Use "is_a?" because it is more readable than checking the "type" field.

app/views/shared/members/_member.html.haml

@@ -80,7 +80,7 @@
       = form_for member, remote: true do |f|
         .prepend-top-10
           = f.select :access_level, options_for_select(member.class.access_level_roles, member.access_level), {}, class: 'form-control'
-        - if member.type == 'ProjectMember'
+        - if member.is_a?(ProjectMember)
           .prepend-top-10
             = f.text_field :expires_at, class: 'form-control js-access-expiration-date', placeholder: 'Access expiration date', id: "member_expires_at_#{member.id}"
         .prepend-top-10