public async Task <IEnumerable <ResponsePositionModel> > GetAllPositions()
        {
            var positions = await _positionManager.GetAllPosition();

            if (positions == null || positions.Count == 0)
            {
                return(null);
            }

            var critToPos = await _dataContext.CriterionsToPosition.Include(x => x.Criterion).ToListAsync();

            var result = positions.Select(x => new ResponsePositionModel
            {
                PositionName = x.PositionName,
                Criterions   = critToPos.Where(xx => xx.PositionId == x.PositionId)
                               .Select(y => new CriterionModel {
                    Name = y.CriterionName, Weight = y.Criterion.Weight
                })
            });

            return(result);
        }