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
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