/// <summary>
/// Moves the quest step with the given key on place up (and changes the previous quest step.
/// </summary>
/// <param name="questStepKey">Unique identifier of the quest step.</param>
/// <returns>An awaitable task that yields no retrun value.</returns>
public async Task MoveDownAsync(Guid questStepKey)
{
var questStep = await questRepository.GetQuestStepAsync(questStepKey);
var previousQuestStep = await questRepository.GetPreviousQuestStepAsync(questStep.QuestKey, questStep.SortOrder);
if (previousQuestStep == null)
{
return;
}
previousQuestStep.SortOrder++;
questRepository.Save(previousQuestStep, ctx => ctx.QuestStep, qs => qs.QuestStepKey == previousQuestStep.QuestStepKey);
questStep.SortOrder--;
questRepository.Save(questStep, ctx => ctx.QuestStep, qs => qs.QuestStepKey == questStep.QuestStepKey);
}
