/// <summary>
/// Returns the specific instance of a generated question template
/// that corresponds to the given seed.
/// </summary>
public async Task <GeneratedQuestionInstance> GetQuestionInstanceAsync(
string classroomName,
int id,
int seed)
{
var question = await GetQuestionAsync(classroomName, id);
if (question == null)
{
return(null);
}
var generatedQuestionTemplate = question as GeneratedQuestionTemplate;
if (generatedQuestionTemplate == null)
{
throw new InvalidOperationException("Seed can only be specified for a generated question.");
}
var result = await _questionGenerator.GenerateQuestionAsync
(
generatedQuestionTemplate,
seed
);
if (result.SerializedQuestion != null)
{
var resultingQuestion = _jsonSerializer.Deserialize <Question>(result.SerializedQuestion);
resultingQuestion.Name = question.Name;
resultingQuestion.QuestionCategoryId = question.QuestionCategoryId;
resultingQuestion.QuestionCategory = question.QuestionCategory;
return(new GeneratedQuestionInstance(resultingQuestion, seed, error: null));
}
else
{
return(new GeneratedQuestionInstance(null /*question*/, seed, result.Error));
}
}
/// <summary>
/// Performs code-question-type-specific update operations.
/// </summary>
protected override async Task UpdateQuestionImplAsync()
{
DbContext.RemoveUnwantedObjects
(
DbContext.ImportedClasses,
importedClass => importedClass.Id,
importedClass => importedClass.CodeQuestionId == Question.Id,
Question.ImportedClasses
);
var generateResult = await _questionGenerator.GenerateQuestionAsync(Question, 0);
if (generateResult.Error != null)
{
Errors.AddError("GeneratorContents", generateResult.Error);
}
else
{
Question.DateModified = _timeProvider.UtcNow;
Question.FullGeneratorFileContents = generateResult.FullGeneratorFileContents;
Question.FullGeneratorFileLineOffset = generateResult.FullGeneratorFileLineOffset;
}
}