Simplify code introduced in 7f7ea81.

Author: aaugustin

debug_toolbar/models.py

@@ -6,27 +6,16 @@
 from debug_toolbar.toolbar.loader import load_panel_classes
 from debug_toolbar.middleware import DebugToolbarMiddleware
 
-loaded = False
 
-
-def is_toolbar(cls):
-    return (issubclass(cls, DebugToolbarMiddleware) or
-            DebugToolbarMiddleware in getattr(cls, '__bases__', ()))
-
-
-def iter_toolbar_middlewares():
-    global loaded
-    for middleware_path in settings.MIDDLEWARE_CLASSES:
-        try:
-            mod_path, cls_name = middleware_path.rsplit('.', 1)
-            mod = import_module(mod_path)
-            middleware_cls = getattr(mod, cls_name)
-        except (AttributeError, ImportError, ValueError):
-            continue
-        if is_toolbar(middleware_cls) and not loaded:
-            # we have a hit!
-            loaded = True
-            yield middleware_cls
-
-for middleware_cls in iter_toolbar_middlewares():
-    load_panel_classes()
+for middleware_path in settings.MIDDLEWARE_CLASSES:
+    # Replace this with import_by_path in Django >= 1.6.
+    try:
+        mod_path, cls_name = middleware_path.rsplit('.', 1)
+        mod = import_module(mod_path)
+        middleware_cls = getattr(mod, cls_name)
+    except (AttributeError, ImportError, ValueError):
+        continue
+
+    if issubclass(middleware_cls, DebugToolbarMiddleware):
+        load_panel_classes()
+        break