HOWTO: passing arguments to functions in Django Template

Django doesn’t allow you because it goes against MVC model, but sometime it’s useful to get output (at view level) depending on specific arguments. For example in my model I have this method:

def get_value(self, arg_to_pass):
    if (arg_to_pass.is_type_A):
        return self.value_for_A
    else:
        return self.value_for_B

In your template you’ll type `` but you can’t pass argument. You can solve this issue with templatetags.
Create a templatetag like this below:

def callMethod(obj, methodName):  
    method = getattr(obj, methodName)
    if obj.__dict__.has_key("__callArg"):  
        ret = method(*obj.__callArg)  
        del obj.__callArg  
        return ret  
    return method()

def args(obj, arg):  
    if not obj.__dict__.has_key("__callArg"):  
        obj.__callArg = []
    obj.__callArg += [arg]  
    return obj

register.filter("call", callMethod)  
register.filter("args", args)

Ok, almost done. Now, in your template, call your method typying:

Job done! If you have any question, leave a comment! :)

Source: sprklab.com