How much view logic should be displayed in views?

Hi,

I have a few cases where a particular value on a page should take 1 of
2 values and so at the top of the template I chose which:

<%
  count = @count1 || @count2
%>
<%= count %>

Often the decision between the two is a little more complicated e.g.,
based on their values. The question is where should this sort of code
go? In a helper? It is the controller that generates the instance
variables @count1 and @count2 so it could very easily do the whole
calculation and create another instance variable (both @count1 and
@count2 are used elsewhere in the page so are still required). Or
should this sort of thing be an attribute on a model?

I am never sure where this sort of logic should go as it is kind of
view logic and kind of business logic.

Thanks in advance,
Toby

You're right, that kind of logic is difficult to place. I have seen
one clean solution to this, though: Presenters

http://spin.atomicobject.com/2008/01/27/the-exceptional-presenter/

Jason