compat: only add compat implementation of RequestFactory.generic() if not

provided by django

rest_framework/compat.py

@@ -199,8 +199,6 @@ if 'patch' not in View.http_method_names:
     View.http_method_names = View.http_method_names + ['patch']
 
 
-# RequestFactory only provides `generic` from 1.5 onwards
-from django.test.client import RequestFactory as DjangoRequestFactory
 from django.test.client import FakePayload
 
 try:
@@ -211,24 +209,30 @@ except ImportError:
     from django.utils.encoding import smart_str as force_bytes_or_smart_bytes
 
 
-class RequestFactory(DjangoRequestFactory):
-    def generic(self, method, path,
-            data='', content_type='application/octet-stream', **extra):
-        parsed = _urlparse(path)
-        data = force_bytes_or_smart_bytes(data, settings.DEFAULT_CHARSET)
-        r = {
-            'PATH_INFO': self._get_path(parsed),
-            'QUERY_STRING': force_text(parsed[4]),
-            'REQUEST_METHOD': six.text_type(method),
-        }
-        if data:
-            r.update({
-                'CONTENT_LENGTH': len(data),
-                'CONTENT_TYPE': six.text_type(content_type),
-                'wsgi.input': FakePayload(data),
-            })
-        r.update(extra)
-        return self.request(**r)
+# RequestFactory only provides `generic` from 1.5 onwards
+if django.VERSION < (1, 5):
+    from django.test.client import RequestFactory as DjangoRequestFactory
+
+    class RequestFactory(DjangoRequestFactory):
+        def generic(self, method, path,
+                data='', content_type='application/octet-stream', **extra):
+            parsed = _urlparse(path)
+            data = force_bytes_or_smart_bytes(data, settings.DEFAULT_CHARSET)
+            r = {
+                'PATH_INFO': self._get_path(parsed),
+                'QUERY_STRING': force_text(parsed[4]),
+                'REQUEST_METHOD': six.text_type(method),
+            }
+            if data:
+                r.update({
+                    'CONTENT_LENGTH': len(data),
+                    'CONTENT_TYPE': six.text_type(content_type),
+                    'wsgi.input': FakePayload(data),
+                })
+            r.update(extra)
+            return self.request(**r)
+else:
+    from django.test.client import RequestFactory
 
 
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