private async Task <IReadOnlyCollection <AuditRecord <Guid> > > CollectSessionInstructorHistory(TopicHistoryQuery request, CancellationToken cancellationToken) { var command = new SessionInstructorHistoryQuery(request.Principal) { TopicId = request.Id }; return(await _mediator.Send(command, cancellationToken)); }
protected override async Task <IReadOnlyCollection <AuditRecord <Guid> > > Process(SessionInstructorHistoryQuery request, CancellationToken cancellationToken) { var parameters = new List <object>(); var sql = new StringBuilder(); sql.AppendLine("SELECT S.*"); sql.AppendLine("FROM [IQ].[SessionInstructor]"); sql.AppendLine("FOR SYSTEM_TIME ALL AS S"); if (request.SessionId.HasValue) { sql.AppendLine("WHERE S.[SessionId] = {0}"); parameters.Add(request.SessionId.Value); } else if (request.TopicId.HasValue) { sql.AppendLine("INNER JOIN [IQ].[Session] AS J ON J.[Id] = S.[SessionId]"); sql.AppendLine("WHERE J.[TopicId] = {0}"); parameters.Add(request.TopicId.Value); } var entities = await DataContext.SessionInstructors .FromSqlRaw(sql.ToString(), parameters.ToArray()) .AsNoTracking() .OrderBy(p => p.PeriodEnd) .ProjectTo <SessionInstructorModel>(Mapper.ConfigurationProvider) .ToListAsync(cancellationToken); var historyList = new List <AuditRecord <Guid> >(); // group changes by id foreach (var group in entities.GroupBy(p => p.Id)) { var groupList = group .OrderBy(p => p.PeriodEnd) .ToList(); var changeList = _changeCollector.CollectChanges(groupList, nameof(SessionInstructor), s => s.DisplayName); historyList.AddRange(changeList); } return(historyList.ToList()); }