def get_datasets_by_user_and_file(cls, user_id, file_id):
"""
Returns dataset object by name of file and user it binds
:param user_id: id of a user
:param file_id: id of a file
:return: Dataset object or None
"""
return Dataset.query.filter(
DB.and_(Dataset.file_id == file_id, Dataset.user_id == user_id))
