Ruby on Rails

I have:
<%= form_for(@supplier) do |f| %>
.......
......
<%= render 'sector_categories', :locals => {:f => f} %>

in _sector_categories partial I have:

<div class="field">
<div id="category_update">
<% for category in @categories %>
<%= f.check_box :category_ids[], category.id,
@supplier.categories.include?(category) %>
<%= category.name %><br />
<% end %>
</div>
</div>

Why it says: undefined local variable or method "f"?

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