2 files changed, 6 insertions, 6 deletions
diff --git a/app/birds/build.py b/app/birds/build.py
index 870133f..565b675 100644
--- a/app/birds/build.py
+++ b/app/birds/build.py
@@ -1,5 +1,5 @@
 import os
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from builder.base import BuildNew
 
 
diff --git a/app/birds/models.py b/app/birds/models.py
index 380e602..c73e7d7 100644
--- a/app/birds/models.py
+++ b/app/birds/models.py
@@ -1,5 +1,5 @@
 import datetime
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.template.defaultfilters import slugify
 from django.contrib.gis.db import models
 from django.contrib.auth.models import User
@@ -43,7 +43,7 @@ class Bird(models.Model):
     slug = models.SlugField()
     scientific_name = models.CharField(max_length=200)
     code = models.IntegerField(choices=ABA_CODES, default=0)
-    bird_class = models.ForeignKey(BirdClass)
+    bird_class = models.ForeignKey(BirdClass, on_delete=models.CASCADE)
     image = models.FileField(upload_to=get_upload_path, null=True, blank=True, help_text="width of high res is 1360px")
     image_credit = models.CharField(max_length=200, blank=True, null=True)
 
@@ -71,7 +71,7 @@ class Bird(models.Model):
 
 
 class BirdAudio(models.Model):
-    bird = models.ForeignKey(Bird, related_name='recordings')
+    bird = models.ForeignKey(Bird, on_delete=models.CASCADE, related_name='recordings')
     audio = models.FileField(upload_to='audio/birds/')
     recorder = models.CharField(max_length=200, null=True, blank=True)
     pub_date = models.DateTimeField()
@@ -88,9 +88,9 @@ class BirdAudio(models.Model):
 
 
 class BirdSighting(models.Model):
-    bird = models.ForeignKey(Bird)
+    bird = models.ForeignKey(Bird, on_delete=models.CASCADE)
     point = models.PointField(blank=True)
-    location = models.ForeignKey(Location, blank=True)
+    location = models.ForeignKey(Location, on_delete=models.CASCADE, blank=True)
     date = models.DateTimeField('Date', default=timezone.now)
     seen_by = models.ManyToManyField(User)
     images = models.ManyToManyField(LuxImage, blank=True)