#30233: add get_queryset_with_parent_obj to InlineModelAdmin to support access
parent_model's instance
               Reporter:  banxi1988      |          Owner:  nobody
                   Type:  New feature    |         Status:  new
              Component:  contrib.admin  |        Version:  master
               Severity:  Normal         |       Keywords:
           Triage Stage:  Unreviewed     |      Has patch:  0
    Needs documentation:  0              |    Needs tests:  0
Patch needs improvement:  0              |  Easy pickings:  0
                  UI/UX:  0              |
 When subclass admin.InlineModelAdmin.
 I want to limit the queryset   related to the parent_models's instance.

 In my usecase, there's a Org Tree Model. and We can set managers for Org.
 So I used  the following ManyToManyField inline:

 class OrgManagerRelationInline(admin.TabularInline):
     model = OrgManagerRelation
     extra = 1

     def get_queryset(self, request):
         qs = super(OrgManagerRelationInline, self).get_queryset(request)
         return qs

 But I want to limit to the manager candicates only belong to higher org
 So I need to access the  parent_model's instance. and there's also a SO
 But I dont'k want to use to unrobust hacking method.

 So think we should provide a `get_queryset_with_parent_obj` or something
 like this.

     def get_queryset(self, request):
         queryset = super().get_queryset(request)
         if not self.has_view_or_change_permission(request):
             queryset = queryset.none()
         return queryset

     def get_queryset_with_parent_obj(self,request,parent_obj):
         return self.get_queryset(request)

 and the calling code in `_create_formsets` can be changed to :

             formset_params = {
                 'instance': obj,
                 'prefix': prefix,

Ticket URL: <https://code.djangoproject.com/ticket/30233>
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