diff --git a/kallithea/model/__init__.py b/kallithea/model/__init__.py
--- a/kallithea/model/__init__.py
+++ b/kallithea/model/__init__.py
@@ -72,8 +72,6 @@ class BaseModel(object):
     :param sa: If passed it reuses this session instead of creating a new one
     """
 
-    cls = None  # override in child class
-
     def __init__(self, sa=None):
         if sa is not None:
             self.sa = sa
diff --git a/kallithea/model/api_key.py b/kallithea/model/api_key.py
--- a/kallithea/model/api_key.py
+++ b/kallithea/model/api_key.py
@@ -38,7 +38,6 @@ log = logging.getLogger(__name__)
 
 
 class ApiKeyModel(BaseModel):
-    cls = UserApiKeys
 
     def create(self, user, description, lifetime=-1):
         """
diff --git a/kallithea/model/changeset_status.py b/kallithea/model/changeset_status.py
--- a/kallithea/model/changeset_status.py
+++ b/kallithea/model/changeset_status.py
@@ -37,8 +37,6 @@ log = logging.getLogger(__name__)
 
 class ChangesetStatusModel(BaseModel):
 
-    cls = ChangesetStatus
-
     def _get_status_query(self, repo, revision, pull_request,
                           with_revisions=False):
         repo = self._get_repo(repo)
diff --git a/kallithea/model/comment.py b/kallithea/model/comment.py
--- a/kallithea/model/comment.py
+++ b/kallithea/model/comment.py
@@ -43,8 +43,6 @@ log = logging.getLogger(__name__)
 
 class ChangesetCommentsModel(BaseModel):
 
-    cls = ChangesetComment
-
     def _get_notification_data(self, repo, comment, user, comment_text,
                                line_no=None, revision=None, pull_request=None,
                                status_change=None, closing_pr=False):
diff --git a/kallithea/model/gist.py b/kallithea/model/gist.py
--- a/kallithea/model/gist.py
+++ b/kallithea/model/gist.py
@@ -46,7 +46,6 @@ GIST_METADATA_FILE = '.rc_gist_metadata'
 
 
 class GistModel(BaseModel):
-    cls = Gist
 
     def _get_gist(self, gist):
         """
diff --git a/kallithea/model/notification.py b/kallithea/model/notification.py
--- a/kallithea/model/notification.py
+++ b/kallithea/model/notification.py
@@ -45,8 +45,6 @@ log = logging.getLogger(__name__)
 
 class NotificationModel(BaseModel):
 
-    cls = Notification
-
     def create(self, created_by, subject, body, recipients=None,
                type_=Notification.TYPE_MESSAGE, with_email=True,
                email_kwargs=None, repo_name=None):
diff --git a/kallithea/model/permission.py b/kallithea/model/permission.py
--- a/kallithea/model/permission.py
+++ b/kallithea/model/permission.py
@@ -44,8 +44,6 @@ class PermissionModel(BaseModel):
     Permissions model for Kallithea
     """
 
-    cls = Permission
-
     def create_permissions(self):
         """
         Create permissions for whole system
diff --git a/kallithea/model/pull_request.py b/kallithea/model/pull_request.py
--- a/kallithea/model/pull_request.py
+++ b/kallithea/model/pull_request.py
@@ -47,8 +47,6 @@ log = logging.getLogger(__name__)
 
 class PullRequestModel(BaseModel):
 
-    cls = PullRequest
-
     def get_pullrequest_cnt_for_user(self, user):
         return PullRequest.query() \
                                 .join(PullRequestReviewers) \
diff --git a/kallithea/model/repo.py b/kallithea/model/repo.py
--- a/kallithea/model/repo.py
+++ b/kallithea/model/repo.py
@@ -56,7 +56,6 @@ log = logging.getLogger(__name__)
 
 class RepoModel(BaseModel):
 
-    cls = Repository
     URL_SEPARATOR = Repository.url_sep()
 
     def _get_user_group(self, users_group):
diff --git a/kallithea/model/repo_group.py b/kallithea/model/repo_group.py
--- a/kallithea/model/repo_group.py
+++ b/kallithea/model/repo_group.py
@@ -43,8 +43,6 @@ log = logging.getLogger(__name__)
 
 class RepoGroupModel(BaseModel):
 
-    cls = RepoGroup
-
     def _get_user_group(self, users_group):
         return self._get_instance(UserGroup, users_group,
                                   callback=UserGroup.get_by_group_name)
diff --git a/kallithea/model/repo_permission.py b/kallithea/model/repo_permission.py
--- a/kallithea/model/repo_permission.py
+++ b/kallithea/model/repo_permission.py
@@ -33,8 +33,6 @@ log = logging.getLogger(__name__)
 
 class RepositoryPermissionModel(BaseModel):
 
-    cls = UserRepoToPerm
-
     def get_user_permission(self, repository, user):
         repository = self._get_repo(repository)
         user = self._get_user(user)
diff --git a/kallithea/model/user.py b/kallithea/model/user.py
--- a/kallithea/model/user.py
+++ b/kallithea/model/user.py
@@ -54,8 +54,6 @@ log = logging.getLogger(__name__)
 class UserModel(BaseModel):
     password_reset_token_lifetime = 86400 # 24 hours
 
-    cls = User
-
     def get(self, user_id, cache=False):
         user = self.sa.query(User)
         if cache:
diff --git a/kallithea/model/user_group.py b/kallithea/model/user_group.py
--- a/kallithea/model/user_group.py
+++ b/kallithea/model/user_group.py
@@ -39,8 +39,6 @@ log = logging.getLogger(__name__)
 
 class UserGroupModel(BaseModel):
 
-    cls = UserGroup
-
     def _get_user_group(self, user_group):
         return self._get_instance(UserGroup, user_group,
                                   callback=UserGroup.get_by_group_name)
diff --git a/kallithea/tests/fixture.py b/kallithea/tests/fixture.py
--- a/kallithea/tests/fixture.py
+++ b/kallithea/tests/fixture.py
@@ -237,7 +237,7 @@ class Fixture(object):
         form_data = {
             'description': u'new-gist',
             'owner': TEST_USER_ADMIN_LOGIN,
-            'gist_type': GistModel.cls.GIST_PUBLIC,
+            'gist_type': Gist.GIST_PUBLIC,
             'lifetime': -1,
             'gist_mapping': {'filename1.txt':{'content':'hello world'},}
         }