Move manager get code to ModelPermission class

Signed-off-by: Roberto Rosario <roberto.rosario@mayan-edms.com>

mayan/apps/acls/classes.py

@@ -98,6 +98,20 @@ class ModelPermission(object):
     def get_inheritance(cls, model):
         return cls._inheritances[model]
 
+    @classmethod
+    def get_manager(cls, model):
+        try:
+            manager_name = cls.get_manager_name(model=model)
+        except KeyError:
+            manager_name = None
+
+        if manager_name:
+            manager = getattr(model, manager_name)
+        else:
+            manager = model._meta.default_manager
+
+        return manager
+
     @classmethod
     def get_manager_name(cls, model):
         return cls._manager_names[model]

mayan/apps/acls/managers.py

@@ -216,18 +216,7 @@ class AccessControlListManager(models.Manager):
             )
             return True
         else:
-            try:
-                manager_name = ModelPermission.get_manager_name(
-                    model=meta.model
-                )
-            except KeyError:
-                manager_name = None
-
-            if manager_name:
-                manager = getattr(obj._meta.model, manager_name)
-            else:
-                manager = obj._meta.default_manager
-
+            manager = ModelPermission.get_manager(model=obj._meta.model)
             source_queryset = manager.all()
 
         restricted_queryset = manager.none()