rest_flex_fields2.views.FlexFieldsMixin
=======================================

.. py:class:: rest_flex_fields2.views.FlexFieldsMixin

   View mixin that restricts which fields may be expanded on list actions.

   Set ``permit_list_expands`` to a list of field names that are allowed to
   be expanded when the view is handling a ``list`` request.  The allowed
   names are passed to the serializer via ``context['permitted_expands']``
   so that `FlexFieldsSerializerMixin` can enforce the constraint.


   .. py:attribute:: permit_list_expands
      :type:  list[str]
      :value: []



   .. py:attribute:: action
      :type:  str | None
      :value: None



   .. py:method:: get_serializer_context() -> dict[str, Any]

      Extend the serializer context with ``permitted_expands`` for list actions.

      When the current action is ``list``, adds
      ``context['permitted_expands']`` populated from ``permit_list_expands``
      so the serializer can restrict expansion accordingly.