django template system, calling a function inside a model

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I want to call a function from my model at a template such as:

class ChannelStatus(models.Model):
 ..............................
 ..............................

    def get_related_deltas(self,epk):
        mystring = ""
        if not self.get_error_code_delta(epk):
            return mystring
        else:
            for i in self.get_listof_outage():
                item = i.error_code.all()
                for x in item:
                    if epk == x.id:
                        mystring= mystring +" "+str(i.delta())
        return mystring

And when I want to call this from the template: assume while rendering, I pass channel_status_list as 

channel_status_list = ChannelStatus.objects.all()

{% for i in channel_status_list %}
  {{ i.get_related_deltas(3) }}
{% endfor %}

This doesn't work, I am able to call a function that consumes nothing, but couln't find what to do if it has parameter(s)

Cheers

django-templates django-models django python
5 Answers

If you find that there are too many properties running around everywhere or you have a template filter for every other method that you write, another solution was suggested on IRC thanks @FunkyBob. It's a little well, erm, funky but it is nice in certain cases.

  class MethodProxy(object):
        """For consolidating into 1 method the calling of methods with various single args
        (suitable dictionary keys)

        class MyModel(models.Model):
            ...

            def magic(self, value):
                # Free the ponies

            def thing(self):
                return MethodProxy(self.magic)

        # Usage
        >>> m = MyModel()
        ...
        >>> m.thing['value'] == m.magic('value')

        # template
        {{ m.thing.value }}

        """

        def __init__(self, method):
            self.method = method
        def __getitem__(self, key):
            return self.method(key)
user_1772930
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