I've got a select in my form with all the groups. So I loop through all available groups.
However; When I try to edit a client, the selectbox doesn't add a selected to the group i've selected. Most likely because of the loop in it. How can I make the right one selected?
<%= f.select(:group_id, options_for_select(@usersGroups.collect{ |u| [u.name, u.id] }), :prompt => "Kies een groep") %>
options_for_select documentation
So in your situation probably something like:
<%= f.select(:group_id, options_for_select(@usersGroups.collect{ |u| [u.name, u.id] }, @client.group_id), :prompt => "Kies een groep") %>