Calling a function for a url tag parameter

Hi,

I am trying to use the url tag on some parameters, one of which needs to come from a function.

For example as follows:

{% with state_url=encode_url flow.state.description %}

<a href="{% url 'advance-flow' flow.id state_url %}">advance</a>

encode_url is defined as follows:

@register.simple_tag

def encode_url(link_text):

    return link_text.replace(' ', '_')

This causes an error on the with statement:

Request Method: GET

Request URL: http://127.0.0.1:8000/list_flows/

Django Version: 1.7

Exception Type: TemplateSyntaxError

Exception Value:

'with' received an invalid token: 'flow.state.description'

I'm guessing that you cannot put another template tag in the "with" statement.  I cannot see a way around this.  Any ideas?

Thanks

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