public Group AddGroup([FromBody] Group group) { var participant1 = _participantService.LoadParticipantById(group.Participant1Id); var participant2 = _participantService.LoadParticipantById(group.Participant2Id); var newGroup = GroupConverter.ConvertDtoToModel(group, participant1, participant2); newGroup = _groupService.AddGroup(newGroup); return(GroupConverter.ConvertModelToDto(newGroup)); }