Remove apps.get_model fallback

* Corrects presumed logic error in `ResolveModelWithPatchedDjangoTests`

rest_framework/compat.py

@@ -82,14 +82,6 @@ def distinct(queryset, base):
     postgres_fields = None
 
 
-# Apps only exists from 1.7 onwards.
-try:
-    from django.apps import apps
-    get_model = apps.get_model
-except ImportError:
-    from django.db.models import get_model
-
-
 # django-filter is optional
 try:
     import django_filters

rest_framework/utils/model_meta.py

@@ -8,11 +8,12 @@
 import inspect
 from collections import namedtuple
 
+from django.apps import apps
 from django.core.exceptions import ImproperlyConfigured
 from django.db import models
 from django.utils import six
 
-from rest_framework.compat import OrderedDict, get_model
+from rest_framework.compat import OrderedDict
 
 FieldInfo = namedtuple('FieldResult', [
     'pk',  # Model field instance
@@ -45,7 +46,7 @@ def _resolve_model(obj):
     """
     if isinstance(obj, six.string_types) and len(obj.split('.')) == 2:
         app_name, model_name = obj.split('.')
-        resolved_model = get_model(app_name, model_name)
+        resolved_model = apps.get_model(app_name, model_name)
         if resolved_model is None:
             msg = "Django did not return a model for {0}.{1}"
             raise ImproperlyConfigured(msg.format(app_name, model_name))

tests/test_utils.py

@@ -150,16 +150,16 @@ class ResolveModelWithPatchedDjangoTests(TestCase):
 
     def setUp(self):
         """Monkeypatch get_model."""
-        self.get_model = rest_framework.utils.model_meta.get_model
+        self.get_model = rest_framework.utils.model_meta.apps.get_model
 
         def get_model(app_label, model_name):
             return None
 
-        rest_framework.utils.model_meta.get_model = get_model
+        rest_framework.utils.model_meta.apps.get_model = get_model
 
     def tearDown(self):
         """Revert monkeypatching."""
-        rest_framework.utils.model_meta.models.get_model = self.get_model
+        rest_framework.utils.model_meta.apps.get_model = self.get_model
 
     def test_blows_up_if_model_does_not_resolve(self):
         with self.assertRaises(ImproperlyConfigured):