Merge branch 'fast-worker-admin' into 'master'

Faster worker admin

Closes #689

See merge request !1284

arkindex/dataimport/admin.py

@@ -71,7 +71,18 @@ class RepositoryAdmin(admin.ModelAdmin):
 
 
 class WorkerVersionInline(admin.StackedInline):
+    show_change_link = True
     model = WorkerVersion
+    fields = ('revision', 'state', 'configuration', 'docker_image_id')
+    readonly_fields = ('revision', 'state', 'configuration', 'docker_image_id')
+
+    def get_queryset(self, *args, **kwargs):
+        """
+        Prefetch worker and revision as they are used in versions inline labels.
+        Using a proxy model to override `__str__` is possible but removes the Change link
+        as the model does not appear as registered.
+        """
+        return super().get_queryset(*args, **kwargs).prefetch_related('worker', 'revision')
 
 
 class WorkerAdmin(admin.ModelAdmin):