app/views/studies/_roles.html.erb
<div class="card-columns">
<% @roles.each do |role| %>
<%= list_panel :roles, title: role.name.humanize.pluralize(role.users.size) do %>
<% role.users.each do |user| %>
<li class="list-group-item d-flex justify-content-between align-items-center">
<span><%= link_to user.name, profile_path(user) %> (<%= user.login %>)</span>
<% if can? :delete, role %>
<%= remote_button "Remove", remove_role_study_path(id: @study, role: {user: user.id, authorizable_type: role.name}), {update: "#role_list"}, {class: 'btn btn-danger'} %>
<% end %>
</li>
<% end %>
<% end %>
<% end %>
</div>