Hi Sebastian,
There is a very significant difference between the third pattern and the
last - the extra set of braces. That extra set of braces means that the
regex group that is being matched is
(?P<playerId>\d+)/
That is - one or more numerical digits, identified as playerId, that *must*
be followed by a slash.
Complicating matters, that entire group is marked as optional, so the
"number plus slash" group is optional on the URL.
As a result,
/player/select/
and
/player/select/1/
should match the pattern, but
/player/select/1
will not (because it doesn't end with a slash).
In contrast, pattern 3 is trying to match:
(?P<playerId>\d+)?/?
That is - one or more numerical digits, which is an optional construct,
optionally followed by a slash. This should find a match with:
/player/select/1/
/player/select/1
/player/select//
/player/select/
I hope that helps.
Yours,
Russ Magee %-)
On Sat, Jun 21, 2014 at 1:44 AM, Sebastian Piskorski <
sebastian.piskor...@gmail.com> wrote:
> I'd like to make sure that this is an error not the feature.
>
> I use following code in template
>
> <li><a href="{% url 'player-select' player.id %}">{{ player.id }} : "{{
> player.name}}"</a></li>
>
> And in urls.py everything goes fine with those rules:
>
> 1. url(r'^player/select/(?P<playerId>\d+)/$', myapp.views.player.select,
> name="player-select"),
> result URL is: /player/select/1/
>
> or:
>
> 2. url(r'^player/select/(?P<playerId>\d+)/?$', myapp.views.player.select,
> name="player-select"),
> result URL is: /player/select/1
>
> or:
>
> 3. url(r'^player/select/(?P<playerId>\d+)?/?$',
> myapp.views.player.select, name="player-select"),
> result URL is: /player/select/1
>
> but with this rule I get error:
>
> 4. url(r'^player/select/((?P<playerId>\d+)/)?$',
> neuroapp.views.player.select, name="player-select"),
> error message:
> Reverse for 'player-select' with arguments '(1L,)' and keyword arguments
> '{}' not found. 1 pattern(s) tried: ['player/select/((?P<playerId>\\d+)/)?
> #39;]
>
> for me 4th pattern is pretty much the same as 3rd, but Django has other
> opinion. If you can, please explain me why.
>
>
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