app_helpers_admin_permissions_helper.rb

module Admin::PermissionsHelper
  def permissions
    ['view', 'create tickets', 'edit tickets', 'delete tickets', 'change states']
  end
end

app_views_admin_index.html.erb

<h2>Permissions for <%= @user.email %></h2>
<%= form_tag update_user_permissions_path, :method => :put do %>
  <table id="permissions" cellspacing="0">
    <thead>
      <th>Project</th>
      <% permissions.each do |name| %>
        <th><%= name.titleize %></th>
      <% end %>
    </thead>
    <tbody>
      <% @projects.each do |project| %>
        <tr class="<%= cycle("odd", "even") %>" id="project_<%= project_id %>">
          <td><%= project.name %></td>
          <% permissions.each do |name| %>
            <td><%= check_box_tag "permissions[#{project.id}][#{name.titleize}]", @ability.can?(name.to_sym, project) %></td>
          <% end %>
        </tr>
      <% end %>
    </tbody>
  </table>
  <%= submit_tag "Update" %>
<% end %>