improve admin display

mentoring/pairing/admin.py

@@ -2,5 +2,12 @@ from django.contrib import admin
 
 from .models import Pair, HistoricalPair
 
-admin.site.register(Pair)
-admin.site.register(HistoricalPair)
+class PairAdmin(admin.ModelAdmin):
+  list_display = ('mentor', 'learner', 'pair_id')
+
+admin.site.register(Pair, PairAdmin)
+
+class HistoricalPairAdmin(admin.ModelAdmin):
+  list_display = ('pair_id',)
+
+admin.site.register(HistoricalPair, HistoricalPairAdmin)

mentoring/pairing/models.py

@@ -53,6 +53,9 @@ class HistoricalPair(models.Model):
     indefinitely.
     """
 
+    def __str__(self):
+        return self.pair_id
+
     @classmethod
     def record_pairing(cls, pair):
         """Record that a pairing has been made."""