search for: core_content_id

I am having issues with a many-to-many table. The table relates resources to standards, but in my resources table has one-to-many relationships so those also appear in my many-to-many table. I am trying to insert into the table via: @resource.core_contents << CoreContent.find(params[:core_content_ids]) But I get this error: Mysql::Error: Duplicate entry ''0-0-0-0-0-0'' for key 1: INSERT INTO core_contents_resources () VALUES () What is the problem? Thanks for the help. Seth Buntin -------------- next part -------------- An HTML attachment was scrubbed... UR...

Here is what I have: add_core_content.rhtml: <select id="resource_core_content_ids" name="resource[core_content_ids][]" size="15" style="width: 200px;" multiple="multiple"> <% @core_contents.each do |c| %> <option value="<%= c.id %>" <% if @resource.core_contents.include? (c) %> selected="s...