public async Task <Release> AddIterationToWorkspaceRelease(Guid workspaceId, Guid releaseId, CreateWorkspaceReleaseIterationDto iterationDto)
        {
            var workspaceFromRepo = await _workspaceRepo.GetWorkspaceById(workspaceId);

            if (workspaceFromRepo == null)
            {
                return(null);
            }

            var newWorkspaceReleaseIteration = _mapper.Map <Iteration>(iterationDto);

            newWorkspaceReleaseIteration.Guid = Guid.NewGuid();

            var releaseToAddIteration = workspaceFromRepo.Releases.FirstOrDefault(x => x.Guid == releaseId);

            if (releaseToAddIteration == null)
            {
                return(null);
            }

            if (releaseToAddIteration.Iterations.IsNullOrEmpty())
            {
                releaseToAddIteration.Iterations = new List <Iteration>();
            }

            releaseToAddIteration.Iterations.Add(newWorkspaceReleaseIteration);

            await _workspaceRepo.CreateOrUpdateWorkspace(workspaceFromRepo);

            return(releaseToAddIteration);
        }