On Oct 1, 6:00 pm, Yiannis <[email protected]> wrote: > Hello > > I have a strange problem with this code: > > <%unless (@students.empty? and params[:commit].nil?) %> > <%="test"%> > <%= render :partial => 'results' %> > <% end %>
[snip] > > The only way it worked was this: > > <% unless @students.empty? %> > <% unless params[:commit].nil?%> I think you have some misunderstanding when it comes to boolean logic - Your code that works is just fundamentally different to the first snippet you showed. unless a unless b ... end end is equivalent to if !a && !b but unless a && b ... end is equivalent to if !( a && b) which in turn is equivalent to !a || ! b (see de morgan's laws) Fred > > <%="test"%> > <%= render :partial => 'results' %> > > <% end %> > <% end %> > > So why "and" - "&&" doesn't work? I tried every combination with () or > without ()... > > Thank you --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
