Remove warnings with Django 1.7 (Closes #195).

Builds upon pull request by @shinuza:

- Properly import ``get_model``
- Run ``django.setup()`` before importing any models.

factory/django.py

@@ -32,8 +32,10 @@
 """factory_boy extensions for use with the Django framework."""
 
 try:
+    import django
     from django.core import files as django_files
 except ImportError as e:  # pragma: no cover
+    django = None
     django_files = None
     import_failure = e
 
@@ -54,6 +56,18 @@ def require_django():
         raise import_failure
 
 
+if django is None:
+    def get_model(app, model):
+        raise import_failure
+
+elif django.VERSION[:2] < (1, 7):
+    from django.db.models.loading import get_model
+
+else:
+    from django import apps as django_apps
+    get_model = django_apps.apps.get_model
+
+
 class DjangoOptions(base.FactoryOptions):
     def _build_default_options(self):
         return super(DjangoOptions, self)._build_default_options() + [
@@ -92,8 +106,7 @@ def _load_model_class(cls, definition):
 
         if is_string(definition) and '.' in definition:
             app, model = definition.split('.', 1)
-            from django.db.models import loading as django_loading
-            return django_loading.get_model(app, model)
+            return get_model(app, model)
 
         return definition
 

tests/test_django.py

@@ -50,6 +50,8 @@
 if django is not None:
     os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'tests.djapp.settings')
 
+    if django.VERSION >= (1, 7, 0):
+        django.setup()
     from django import test as django_test
     from django.conf import settings
     from django.db import models as django_models
@@ -64,8 +66,6 @@
 else:
     django_test = unittest
 
-if django is not None and django.VERSION >= (1, 7, 0):
-    django.setup()
 
 test_state = {}