public void CreateGroup(GroupViewModel newGroup, int userId)
{
int groupId = _groupRepository.Add(newGroup.ToEntity());
var role = _roleRepository.Get(r => r.Name.Equals(RoleNames.ROLE_OWNER)).Single();
GroupMember groupMember = new GroupMember()
{
GroupId = groupId, UserId = userId, RoleId = role.Id, JoinedAt = DateTime.Now
};
_groupMemberRepository.AddUserToGroup(groupMember);
}