Help writing better block helpers

I basically use block helpers to avoid writing out conditions in my views. Sometimes I’d also like to avoid looping statements, but I don’t know how. For instance, in the case of displaying a table and its multiple rows. Currently, I might do something like this:

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# helper
def table_rows_for(contents, &block)
  unless contents.blank?
    yield
  else
    text = "Currently no contents for this view."
    tr   = content_tag(:tr, content_tag(:td, text, :colspan => '3'))
    concat(tr, block.binding)
  end
end

# view
<table>
  <tr>
    <th>Title</th><th>Changed By</th><th>Changed When</th>
  </tr>
  <% table_rows_for somethings do %>
    <% somethings.each do |something| %>
      <!-- more ERB stuff -->
    <% end -%>
  <% end -%>
</table>

I would like to include the loop inside of the helper as well, since the contents are being passed, anyway. However, everything I’ve tried results in nil object errors. In a standard loop, the methods are qualified with an object variable (“something” in the example above), and that’s a lot of what I don’t know how to handle. I’d like to just pass the contents to a table_for helper, instead of a table_rows_for helper. I could do that by avoiding the block helper altogether, and construct the html manually in a regular helper, but I still want the html block visible in my view.

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def table_for(contents, &block)
  unless contents.blank?
    start = "<table><tr><th>Title</th><th>Changed by</th><th>Changed when</th></tr>"
    concat(start, block.binding)
    contents.each do
      # don't know what to do here
      concat(capture(&block), block.binding)
    end
    concat('</table>', block.binding)
  else
    text = "Currently no contents for this view."
    tr   = content_tag(:tr, content_tag(:td, text, :colspan => '3'))
    concat(tr, block.binding)
  end
end

That’s probably not even close, but inside of the contents loop is what I’m having trouble with. Concatenating the captured block seems logical to me. But even if it was right, I don’t know what to do in the ERB (the block I’d be passing). I can no longer do something.title because something now belongs to the helper. If anyone can decipher my issue, please feel free to enlighten me.