Use AUTH_USER_MODEL consistently between various Django versions. Closes #946

rest_framework/authtoken/models.py

 import uuid
 import hmac
 from hashlib import sha1
-from rest_framework.compat import User
+from rest_framework.compat import AUTH_USER_MODEL
 from django.conf import settings
 from django.db import models
 
@@ -11,7 +11,7 @@ class Token(models.Model):
     The default authorization token model.
     """
     key = models.CharField(max_length=40, primary_key=True)
-    user = models.OneToOneField(User, related_name='auth_token')
+    user = models.OneToOneField(AUTH_USER_MODEL, related_name='auth_token')
     created = models.DateTimeField(auto_now_add=True)
 
     class Meta:

rest_framework/compat.py

@@ -83,15 +83,9 @@ def get_concrete_model(model_cls):
 # Django 1.5 add support for custom auth user model
 if django.VERSION >= (1, 5):
     from django.conf import settings
-    if hasattr(settings, 'AUTH_USER_MODEL'):
-        User = settings.AUTH_USER_MODEL
-    else:
-        from django.contrib.auth.models import User
+    AUTH_USER_MODEL = settings.AUTH_USER_MODEL
 else:
-    try:
-        from django.contrib.auth.models import User
-    except ImportError:
-        raise ImportError("User model is not to be found.")
+    AUTH_USER_MODEL = 'auth.User'
 
 
 if django.VERSION >= (1, 5):

rest_framework/runtests/settings.py

@@ -134,6 +134,8 @@ PASSWORD_HASHERS = (
     'django.contrib.auth.hashers.CryptPasswordHasher',
 )
 
+AUTH_USER_MODEL = 'auth.User'
+
 import django
 
 if django.VERSION < (1, 3):