quick problem with str and int

[MikeKJ]

So unfortunately due to historical reason a numerical reference is set as a CharField in the model now I want to pass that reference through a url to json serialise something so

<a href="/json/{{ reference }}/>ddddd</a>  as in /json/810044/

so I used /json/{{ reference|add:"0" }}/  to make it an int in the template

but I still get

Exception Type: TypeError at /json/810044/
Exception Value: 'str' object is not callable

the url line is

(r'^json/(?P<this_ref>.*)/$', '/views/json'),

I am not entirely sure where it is complaining about str being uncallable but having cast it to int in the a href in the template  surely it should have resolved?  Any clues please?

[Shawn Milochik]

How about adding a get_absolute_url method to your model? Then you can take care of the logic there, instead of the template.

https://docs.djangoproject.com/en/1.5/ref/models/instances/#get-absolute-url

Worst-case, you can just do the conversion in your view and assign it as a new property to your model. Since it's just a Python class instance, you can do my_obj.temp_url = (whatever) and then your template can access my_obj.temp_url. 

[Addy Yeow]

You would want to match this, (?P<this_ref>.*),  against a string not integer.

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[MikeKJ]

Good idea so: 

In the model added

    def get_json_reference(self):
        return "/json/%i/" % int(self.reference)

called <a href="{{ v.get_json_reference }}">  which does produce the correct url for all in the for loop but still get

[MikeKJ]

I did try that against just the string and got the same error hence the cast to int attempt, when cast to int I am using
(r'^json/(?P<this_ref>\d+)/$', '/views/json'),