public async Task <IActionResult> GetStatsJson(int id)
{
var request = new GenerateStatistics {
PollId = id
};
var stat = await _mediator.Send(request);
return(Ok(stat));
}
public async Task <IEnumerable <QuestionStatistics> > Handle(GenerateStatistics request, CancellationToken cancellationToken)
{
// Run tasks asynchronously.
var t1 = _unitOfWork.Polls.Get(request.PollId);
var t2 = _unitOfWork.Answers.GetAll(request.PollId);
await Task.WhenAll(t1, t2);
_unitOfWork.Complete();
// When tasks are finished assign result to variables.
var poll = t1.Result;
var answers = t2.Result;
// Answers grouped by id of questions.
var dict = new Dictionary <string, List <Answer> >();
// Group answers.
foreach (var answer in answers)
{
if (dict.ContainsKey(answer.QuestionId))
{
dict[answer.QuestionId].Add(answer);
}
else
{
dict.Add(answer.QuestionId, new List <Answer> {
answer
});
}
}
var stats = new List <QuestionStatistics>();
// Loop through each question and generate statistics for it.
foreach (var question in poll.Questions)
{
if (dict.ContainsKey(question.Id))
{
var questionStats = question.GenerateStatistics(dict[question.Id]);
stats.Add(questionStats);
}
else
{
var s = question.GenerateStatistics(new List <Answer>());
stats.Add(s);
}
}
return(stats.OrderBy(x => x.Question.Number));
}