Optimize DB access in AccessTokenAdmin (#988)

This is needed to avoid 2 extra DB queries per each line in the list view, so that is usually +200 unnecessary queries.

Co-authored-by: Asif Saif Uddin <[email protected]>

Author: knaperek

AUTHORS

@@ -36,6 +36,7 @@ Jerome Leclanche
 Jim Graham
 Jonas Nygaard Pedersen
 Jonathan Steffan
+Jozef Knaperek
 Jun Zhou
 Kristian Rune Larsen
 Paul Dekkers

oauth2_provider/admin.py

@@ -26,6 +26,7 @@ class ApplicationAdmin(admin.ModelAdmin):
 
 class AccessTokenAdmin(admin.ModelAdmin):
     list_display = ("token", "user", "application", "expires")
+    list_select_related = ("application", "user")
     raw_id_fields = ("user", "source_refresh_token")