Updating the checkboxes with data from the db

I'm making a musicians site where the users are able to check some checkboxes with their music-style if they want to edit their music-style i would like the previous checked checkboxes to be checked.

here's some code

<div class="form_row">         <label for="looking_for"><%= label %>:</label> <table> <tr> <% @i = 0 %> <% @status = false%>     <% collection.each do |db_field| %>       <% db_collection.split(", ").each do |collection_field| %>         <% if db_field == collection_field %>           <% @status = true %>           <% else %>             <% @status = false%>           <% end %>         <% end %>       <td>        <%= check_box_tag array, db_field, @status %>        <%= db_field %>       </td>        <% if @i == 1 %>        <% @i = -1 %>        </tr><tr>        <% end %>        <% @i = @i +1 %>        <% end %> </tr> </table> </div>

collection could be:

VALID_STYLES = ["Blues", "Country", "Elektronisk", "Folkemusik", "Hip-Hop",                   "Jazz", "Klassisk", "Metal", "Pop", "R&B og Soul", "Rock",                   "Verdensmusik"]

and the db_collection could be:

Blues, Elektronisk, R&B og Soul

I don't know why, but with the code i have now R&B og Soul would get updated in the view so that the checkbox would be checked, it's always the last option that gets checked.