:param sa: If passed it reuses this session instead of creating a new one

    """

    def __init__(self, sa=None):

        if sa is not None:

            self.sa = sa

class ApiKeyModel(BaseModel):

    def create(self, user, description, lifetime=-1):

        """

class ChangesetStatusModel(BaseModel):

    def _get_status_query(self, repo, revision, pull_request,

                          with_revisions=False):

        repo = self._get_repo(repo)

class ChangesetCommentsModel(BaseModel):

    def _get_notification_data(self, repo, comment, user, comment_text,

                               line_no=None, revision=None, pull_request=None,

                               status_change=None, closing_pr=False):

class GistModel(BaseModel):

    def _get_gist(self, gist):

        """

class NotificationModel(BaseModel):

    def create(self, created_by, subject, body, recipients=None,

               type_=Notification.TYPE_MESSAGE, with_email=True,

               email_kwargs=None, repo_name=None):

    Permissions model for Kallithea

    """

    def create_permissions(self):

        """

        Create permissions for whole system

class PullRequestModel(BaseModel):

    def get_pullrequest_cnt_for_user(self, user):

        return PullRequest.query() \

                                .join(PullRequestReviewers) \

class RepoModel(BaseModel):

    URL_SEPARATOR = Repository.url_sep()

    def _get_user_group(self, users_group):

class RepoGroupModel(BaseModel):

    def _get_user_group(self, users_group):

        return self._get_instance(UserGroup, users_group,

                                  callback=UserGroup.get_by_group_name)

class RepositoryPermissionModel(BaseModel):

    def get_user_permission(self, repository, user):

        repository = self._get_repo(repository)

        user = self._get_user(user)

class UserModel(BaseModel):

    password_reset_token_lifetime = 86400 # 24 hours

    def get(self, user_id, cache=False):

        user = self.sa.query(User)

        if cache:

class UserGroupModel(BaseModel):

    def _get_user_group(self, user_group):

        return self._get_instance(UserGroup, user_group,

                                  callback=UserGroup.get_by_group_name)

        form_data = {

            'description': u'new-gist',

            'owner': TEST_USER_ADMIN_LOGIN,

            'lifetime': -1,

            'gist_mapping': {'filename1.txt':{'content':'hello world'},}

        }