def clean_geom(self):
pk = self.instance.pk if self.instance and self.instance.pk else -1
geom = self.cleaned_data['geom']
if geom is None:
raise forms.ValidationError(_("Invalid snapped geometry."))
if not geom.simple:
raise forms.ValidationError(_("Geometry is not simple."))
if not Path.check_path_not_overlap(geom, pk):
raise forms.ValidationError(_("Geometry overlaps another."))
return geom
