Yes, you're right! I won't go into where the mistake was but although the problem was in the code I submitted, the error (just my way of thinking, was in another part of the code)
So what you said got me thinking and I addressed another part of the code and found the error. Merci!! 2009/8/31 Frederick Cheung <[email protected]> > > > > On Aug 31, 8:16 pm, Anthony Gardner <[email protected]> wrote: > > Frederick, > > > > Thanks for getting back but you're missing the point, they're working on > > the same data. > > I realise. > > > > The .each block iterates over the data correctly but the same data throws > > the nil object error when I index the item. > > > If the array is empty then each will be a no-op, unlike accessing [0]. > Sounds like somewhere there is an item with no attendees. > > Fred > > > That's the problem. > > > > -Ants > > > > 2009/8/31 Frederick Cheung <[email protected]> > > > > > > > > > > > > > > > > > On Aug 31, 7:57 pm, Anthony Gardner <[email protected]> wrote: > > > > This is a repost as I had zero replies to my first email. This > problem is > > > > driving me mad but it has to be a simple solution that I just can;t > see. > > > > > > Can someone please tell me what the difference is between the > following > > > bits > > > > of code .... > > > > > > <!-- this outputs the correct result --> > > > > <% @swimming_class.lessons.each do |lesson| %> > > > > <% lesson.lesson_register.attendees.each do |att| %> > > > > <%= att.enrollee_id %> > > > > <br /> > > > > <% end %> > > > > <% end %> > > > > > > <!-- the following outputs > > > > > > You have a nil object when you didn't expect it! > > > > The error occurred while evaluating nil.enrollee_id > > > > > > --> > > > > <% @swimming_class.lessons.each do |lesson| %> > > > > <% lesson.lesson_register.attendees[0].enrollee_id %> > > > > <% end %> > > > > > if a lesson register has no attendees the second snippet will try to > > > access it anyway whereas the first won't > > > > > Fred > > > > > > Thsnk you > > > > > > -- > > > > The sun comes up and we start again > > > > -- > > 100% naturally selected. 0% designed. > > > -- 100% naturally selected. 0% designed. --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
