manager: add a default implementation of ExportMixin.get_data() (#13587)

It takes the default queryset and batches it using the new function
batch_queryset().

src/authentic2/manager/role_views.py

@@ -92,9 +92,6 @@ add = RoleAddView.as_view()
 class RolesExportView(views.ExportMixin, RolesView):
     resource_class = resources.RoleResource
 
-    def get_data(self):
-        return self.get_queryset()
-
 export = RolesExportView.as_view()
 
 

src/authentic2/manager/user_views.py

@@ -298,23 +298,11 @@ class UserEditView(OtherActionsMixin, ActionMixin, BaseEditView):
 user_edit = UserEditView.as_view()
 
 
-# Mock object to disable Queryset specialization by django-import-export
-class IterateIterable(object):
-    def __init__(self, qs):
-        self.qs = qs
-
-    def __iter__(self):
-        return self.qs.__iter__()
-
-
 class UsersExportView(ExportMixin, UsersView):
     permissions = ['custom_user.view_user']
     resource_class = UserResource
     export_prefix = 'users-'
 
-    def get_data(self):
-        return IterateIterable(self.get_queryset())
-
 users_export = UsersExportView.as_view()
 
 

src/authentic2/manager/views.py

@@ -22,7 +22,7 @@ from django_select2.views import AutoResponseView
 from django_rbac.utils import get_ou_model
 
 from authentic2.forms import modelform_factory
-from authentic2.utils import redirect
+from authentic2.utils import redirect, batch_queryset
 from authentic2.decorators import json as json_view
 from authentic2 import hooks
 
@@ -131,12 +131,6 @@ class FilterTableQuerysetByPermMixin(object):
         return qs
 
 
-class FilterDatasetQuerysetByPermMixin(object):
-    def get_dataset(self):
-        qs = super(FilterDatasetQuerysetByPermMixin, self).get_dataset()
-        return filter_view(self.request, qs)
-
-
 class TableQuerysetMixin(object):
     def get_table_queryset(self):
         return self.get_queryset()
@@ -338,6 +332,10 @@ class ExportMixin(object):
     def get_resource(self):
         return self.resource_class()
 
+    def get_data(self):
+        qs = self.get_queryset()
+        return batch_queryset(qs)
+
     def get_dataset(self):
         return self.get_resource().export(self.get_data())