Use list_display instead.

src/rideshare/admin.py

@@ -5,4 +5,5 @@ from .models import Ride
 
 @admin.register(Ride)
 class RideModelAdmin(admin.ModelAdmin):
+    list_display = ('location', 'when', 'seats', 'user')
     list_filter = ('camp', 'user')

src/rideshare/models.py

@@ -20,11 +20,3 @@ class Ride(UUIDModel, CampRelatedModel):
                 'camp_slug': self.camp.slug
             }
         )
-
-    def __str__(self):
-        return "{} seats from {} at {} by {}".format(
-            self.seats,
-            self.location,
-            self.when,
-            self.user
-        )