Rails - Jul 2008 - accessing the keyname and the value

Hello
in PHP i can access the Keynames of an array by using this option:

        while(list($k,$v) = each($uebergabe)) {
                        if($k <> "Abschicken" ){
                                $koepfe[] = $k;
                                $werte[]  = $v;
                        }//if
                }//while

I want do use this in rails do make my code more flexible. I have a
database and in the showview it is displayed like this:
<p>
  <b>Zeitung:</b>
  <%=h @auftrag.zeitung %>
</p>

<p>
  <b>Zeitung sonst:</b>
  <%=h @auftrag.zeitung_sonst %>
</p>

<p>
  <b>Gemeinschaft:</b>
  <%=h @auftrag.gemeinschaft %>
</p>

<p>
  <b>Ersch datum:</b>
  <%=h @auftrag.ersch_datum %>
</p>

<p>
  <b>Art:</b>
  <%=h @auftrag.art %>
</p>

<p>
  <b>Spalten:</b>
  <%=h @auftrag.spalten %>
</p>

<p>
  <b>Format:</b>
  <%=h @auftrag.format %>
</p>

But if a field ist empty the name is also displayed.
so my thougt ist something like this:
<% @auftrag.each do |item|%>
<% if @auftrag.format > "" %>
<b><%= KEYNAME %>:</b>
<%= h @auftrag.format %>
<%end%>
<%end%>

BUT how do i get the name of the current key belonging to the value?
The Array @auftrag is defined in the Controller by using
@auftrags = Auftrag.find(:all)

Any Idea?
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<% @auftrag.attributes.each do |key, item| %>
<% if @auftrag.format > "" %>
<b><%= key %>:</b>
<%= h @auftrag.format %>
<%end%>
<%end%>

would work

btw: using german for naming is a bad idea,
since it breaks Rails pluralization.
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next problem: when i compare the items with ""
I get the follwing error, when i have a DATE-Field:
"comparison of Time with String failed"
Is there a more elegant way to ask if the Item-Field has values in it?
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