On Wed, Mar 21, 2012 at 2:58 PM, Larry Martell <larry.mart...@gmail.com> wrote:
> OK, but is there some reason {{ headers.0.forloop.counter } does not
> work when forloop.counter has a value of 2, yet {{ headers.0.2 }}
> does work?Django never does variable interpolation when resolving dot separated variables. What django does do when it resolves dot separated variables is well documented: https://docs.djangoproject.com/en/1.3/topics/templates/#variables So outputting 'headers.0.forloop.counter' first finds the 'headers' variable, and gets the 0th entry. In fact, first of all it tries headers.get('0') IE, a dictionary lookup. This fails, so it tries getattr(headers, '0') IE, an attribute lookup. This fails, so it tries headers.0() * IE, a method call. This fails, so it tries headers[0] IE, a list index lookup. Having got 'headers.0' resolved, it would then step on to the next part of the lookup - 'forloop'. I think if you trace through yourself what it will do to lookup forloop as a dictionary entry of headers[0], an attribute of headers[0], a method call of headers[0] or a list index lookup of headers[0], you will see that obviously all of these would fail. If you replace forloop.counter with the raw value '2' and repeat the process, you'll see why that works as well. Cheers Tom * It doesn't actually do this, I haven't checked the code, but it probably does something like this: val = headers.get('0') if not val: val = getattr(headers, '0') if callable(val): return val() if not val: val = headers[0] return val -- You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com. To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/django-users?hl=en.
