private async Task <ListRepositoriesViewModel> BuildListRepositoriesViewModel(IGitHubUserModelService gitHubUserModelService)
        {
            var installations = await gitHubUserModelService.GetInstallationsAsync();

            var repositoriesByOwner = installations
                                      .SelectMany(installation => installation.Repositories)
                                      .GroupBy(repository => repository.Owner)
                                      .OrderBy(grouping => grouping.Key)
                                      .ToArray();

            var issuedAccessTokens = await _accessTokenService.GetTokensForUserRepositoriesAsync();

            var tokenLookup = issuedAccessTokens.ToLookup(t => t.GitHubRepositoryId, r => r);

            return(new ListRepositoriesViewModel
            {
                TokenLookup = tokenLookup,
                RepositoriesByOwner = repositoriesByOwner
            });
        }