/// <summary>
/// Delete question by performing compensating actions to StoreQuestion() to keep the datastore in a consistent state
/// </summary>
/// <param name="questionId"></param>
public void DeleteQuestion(long questionId)
{
using (var redis = RedisManager.GetClient())
{
var redisQuestions = redis.As <Question>();
var question = redisQuestions.GetById(questionId);
if (question == null)
{
return;
}
//decrement score in tags list
question.Tags.ForEach(tag => redis.IncrementItemInSortedSet(TagIndex.All, tag, -1));
//remove all related answers
redisQuestions.DeleteRelatedEntities <Answer>(questionId);
//remove this question from user index
redis.RemoveItemFromSet(UserQuestionIndex.Questions(question.UserId), questionId.ToString());
//remove tag => questions index for each tag
question.Tags.ForEach(tag => redis.RemoveItemFromSet(TagIndex.Questions(tag), questionId.ToString()));
redisQuestions.DeleteById(questionId);
}
}
public void StoreQuestion(Question question)
{
using (var redis = RedisManager.GetClient())
{
var redisQuestions = redis.As <Question>();
if (question.Tags == null)
{
question.Tags = new List <string>();
}
if (question.Id == default(long))
{
question.Id = redisQuestions.GetNextSequence();
question.CreatedDate = DateTime.UtcNow;
//Increment the popularity for each new question tag
question.Tags.ForEach(tag => redis.IncrementItemInSortedSet(TagIndex.All, tag, 1));
}
redisQuestions.Store(question);
redisQuestions.AddToRecentsList(question);
redis.AddItemToSet(UserQuestionIndex.Questions(question.UserId), question.Id.ToString());
//Populate tag => questions index for each tag
question.Tags.ForEach(tag => redis.AddItemToSet(TagIndex.Questions(tag), question.Id.ToString()));
}
}
public List <QuestionResult> GetQuestionsTaggedWith(string tagName)
{
using var redis = RedisManager.GetReadOnlyClient();
var questionIds = redis.GetAllItemsFromSet(TagIndex.Questions(tagName));
var questions = redis.As <Question>().GetByIds(questionIds);
return(ToQuestionResults(questions));
}
