I defined two models (Tag and Page), where the Page model links to the Tag model:
tags = models.ManyToManyField(Tag, blank=True) For a single tag, I can refer to the pages linked to that tag like so: for page in tag.page_set: ... results = tag.page_set.count() But I cannot find a way to obtain a list of tags where each tag is linked to at least one page. My attempt tags = Tag.objects.filter(page_set__count__gt=0) results in an error: Django complains that the field 'page_set' is unknown. Why can I use page_set as a 'virtual' tag property (even though this set is not defined in the model), and how can I refer to the page_set in a query? Many thanks, Jan
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