Django models filter by foreignkey
A more direct alternative:
autors = Autor.objects.filter(recolha__categoria=MyCategoria)where MyCategoria is the relevant CategoriaRecolha instance. Or, if you want to match agains the specific category name, you can extend the query another level:
autors = Autor.objects.filter(recolha__categoria__categoria='my_category_name')
in django 2 is ForeignKey.limit_choices_to docs
staff_member = models.ForeignKey( User, on_delete=models.CASCADE, limit_choices_to={'is_staff': True},)
cat = CategoriaRecolha.objects.get(field=value)rows = Recolha.filter(categoria=cat)autors = [row.autor for row in rows]The Django Docs explain this pretty well.