run python function in output of annotated query

Hello django-users,

I have a unmanaged model, of legacy database, used only to read.

I need to clean the value of a field returned in a annotated query.

I try created a new model field inherits from TextField and override to_python method to clean the value (remove all html using python-bleach), and use in a query like:

FooBar.objects.annotate(title=ExpressionWrapper(F('html_title'), output_field=RemoveHTMLTextField())) .

I expected the method to_python was called, but it does not. 

Any idea how to solve this problem?

this is probably wrong, but it was the only way I thought so far....

####

import bleach

from django.db import models

from django.template.defaultfilters import striptags

from django.utils.safestring import mark_safe

class RemoveHTMLTextField(models.TextField):

    def to_python(self, value):

        original_value = super(RemoveHTMLTextField, self).to_python(value)

        striped_str = striptags(original_value)

        return mark_safe(bleach.clean(striped_str))

####

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