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In order to generate the object_ids, you need to ensure that the has_many relationship

exists in their respective models first!!!

<%= form_for(@movie, :url => {:action => "create"}) do |f| %>
<table id="movie-new">
<!--...-->
        <td><%= f.label(:genre, "Genre(s)") %></td>
        <td><%= f.collection_check_boxes(:genre_ids, Genre.all, :id, :name) %>
        <!--pay attention to the first arg: genre_ids, not just genre_id-->
        </td>
    </tr>
<!--...-->
<% end %>

• movie has_many genres and genres has_many movies