render_collection_with_partial

# File actionview/lib/action_view/renderer/collection_renderer.rb, line 104
    def render_collection_with_partial(collection, partial, context, block)
      iter_vars  = retrieve_variable(partial)

      collection = if collection.respond_to?(:preload_associations)
        PreloadCollectionIterator.new(collection, partial, iter_vars, collection)
      else
        SameCollectionIterator.new(collection, partial, iter_vars)
      end

      template = find_template(partial, @locals.keys + iter_vars)

      layout = if !block && (layout = @options[:layout])
        find_template(layout.to_s, @locals.keys + iter_vars)
      end

      render_collection(collection, context, partial, template, layout, block)
    end