docs: def get_formset(self, request, obj=None, **kwargs):
          """
          Load Synchronizer schema to display specific fields in admin
          """
          if obj is not None:
              try:
                  # this is enough to load the new schema
                  obj.external
              except LayerExternal.DoesNotExist:
                  pass
          return super(LayerExternalInline, self).get_formset(request, obj=None, **kwargs)