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Improved model select field for generic relationships

Author:
kratorius
Posted:
July 2, 2009
Language:
Python
Version:
1.0
Tags:
models form field contenttypes translation browse
Score:
2 (after 2 ratings)

Browse through the installed models using the content types framework. There are two difference in behavior with respect to the default field:

  1. if a model provides a translation for its name (e.g.: verbose_name and/or verbose_name_plural), it shows that rather than a raw model name
  2. allow to filter the models shown through the use of choice parameter

Example:

mbf = ModelBrowseField(choices=['User', 'Session'])

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class ModelBrowseField(forms.ChoiceField):
    """
    Browse through the installed models using the content types framework.
    There are two difference in behavior with respect to the default field:

      1. if a model provides a translation (e.g.: verbose_name and/or
         verbose_name_plural), we show that rather than a raw model name
      2. allow to filter the models shown
    """
    def __init__(self, choices=None, *args, **kwargs):
        from django.contrib.contenttypes.models import ContentType

        qs = ContentType.objects.all()
        if choices:
            # if there's a list of allowed models, filter the queryset
            choices = list(choices)

            # labels are all lowercase
            choices = [choice.lower() for choice in choices]
            qs = qs.filter(model__in=choices)

        choices = qs.values_list('id', 'name')

        # translate items (if available)
        newchoices = []
        for id, choice in choices:
            id, mclass = id, ContentType.objects.get(pk=id).model_class()
            if mclass:
                newchoices.append((id, mclass._meta.verbose_name))
        choices = newchoices

        choices.insert(0, ('', '---------'))
        super(ModelBrowseField, self).__init__(choices=choices, *args, **kwargs)

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Comments

sberlotto (on July 2, 2009):

Wow! very good work !

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