If the current user meets the given privilege, permitted_to? returns true and yields to the optional block. The attribute checks that are defined in the authorization rules are only evaluated if an object is given for context.

Examples:

    <% permitted_to? :create, :users do %>
    <%= link_to 'New', new_user_path %>
    <% end %>
    ...
    <% if permitted_to? :create, :users %>
    <%= link_to 'New', new_user_path %>
    <% else %>
    You are not allowed to create new users!
    <% end %>
    ...
    <% for user in @users %>
    <%= link_to 'Edit', edit_user_path(user) if permitted_to? :update, user %>
    <% end %>

[Source]

    # File lib/helper.rb, line 27
27:     def permitted_to? (privilege, object_or_sym = nil, &block)
28:       controller.permitted_to?(privilege, object_or_sym, &block)
29:     end