protected virtual IQueryExecutionResult <TRecord> ExecuteGrouping <TSource, TRecord>()
{
var result = new QueryExecutionGroupResult <TRecord>();
// preserve queryable.
var queryableAfterFilters = CurrentQueryable;
result.TotalRecords = queryableAfterFilters.LongCount();
CalculatePageCount(result);
// intercept groups in advance to avoid doing it more than once :)
var finalGroups = Criteria.Groups.Select(g => InterceptGroup <TSource>(g)).ToList();
// get the aggregates.
var aggregateResults = FetchAggregates <TSource>(finalGroups);
// sorting.
finalGroups.ReversedForEach(fg => Criteria.Sorts.Insert(0, new Sort(fg.Path, fg.Ascending)));
// apply sorting and paging.
ApplySorting <TSource>();
ApplyPaging <TSource>();
if (Options.GroupByInMemory)
{
CurrentQueryable = CurrentQueryable.ToObjectList().Cast <TSource>().AsQueryable();
}
CurrentQueryable = CurrentQueryable.GroupBy(QueryableUnderlyingType, gb =>
{
gb.NullChecking(Options.GroupByInMemory ? Options.GroupByInMemoryNullCheck : false);
finalGroups.ForEach((fg, index) => gb.Path(fg.Path, $"Key_{index}"));
});
CurrentQueryable = CurrentQueryable.Select(sb =>
{
sb.NullChecking(Options.GroupByInMemory ? Options.GroupByInMemoryNullCheck : false);
finalGroups.ForEach((fg, index) => sb.Key($"Key_{index}", $"Key_{index}"));
sb.ToList("Records");
});
// loop through the grouped records.
var groupRecords = CurrentQueryable.ToDynamicClassList();
// now join them into logical collections
var lastLists = new List <(List <TSource> source, IGroupQueryResult <TRecord> group)>();
result.Groups = RecursiveRegroup <TSource, TRecord>(groupRecords, aggregateResults, Criteria.Groups.First(), lastLists);
// intercept grouped by.
QueryInterceptToGrouped <TSource, TRecord>(lastLists).Wait();
result.Aggregates = CalculateTotalAggregate <TSource>(queryableAfterFilters);
return(result);
}
protected virtual async Task <IQueryExecutionResult <TRecord> > ExecuteAsyncGrouping <TSource, TRecord>(CancellationToken cancellationToken)
{
var result = new QueryExecutionGroupResult <TRecord>();
// preserve queryable.
var queryableAfterFilters = CurrentQueryable;
// async.
result.TotalRecords = await this.AsyncQueryableService.LongCountAsync((IQueryable <TSource>) queryableAfterFilters, cancellationToken);
CalculatePageCount(result);
// intercept groups in advance to avoid doing it more than once :)
var finalGroups = Criteria.Groups.Select(g => InterceptGroup <TSource>(g)).ToList();
// get the aggregates.
var aggregateResults = await FetchAggregatesAsync <TSource>(finalGroups, cancellationToken);
// sorting.
finalGroups.ReversedForEach(fg => Criteria.Sorts.Insert(0, new Sort(fg.Path, fg.Ascending)));
// apply sorting and paging.
ApplySorting <TSource>();
ApplyPaging <TSource>();
// create group & select expression.
CurrentQueryable = CurrentQueryable.GroupBy(QueryableUnderlyingType, gb => finalGroups.ForEach((fg, index) => gb.Path(fg.Path, $"Key_{index}")));
CurrentQueryable = CurrentQueryable.Select(sb =>
{
finalGroups.ForEach((fg, index) => sb.Key($"Key_{index}", $"Key_{index}"));
sb.ToList("Records");
});
// loop through the grouped records.
var groupRecords = await AsyncQueryableService.ToListAsync(CurrentQueryable.Cast <DynamicClass>(), cancellationToken);
// now join them into logical collections
var lastLists = new List <(List <TSource> entities, IGroupQueryResult <TRecord> group)>();
result.Groups = RecursiveRegroup <TSource, TRecord>(groupRecords, aggregateResults, Criteria.Groups.First(), lastLists);
// converted to grouped by.
await QueryInterceptToGrouped <TSource, TRecord>(lastLists);
result.Aggregates = await CalculateTotalAggregateAsync <TSource>(queryableAfterFilters, cancellationToken);
return(result);
}
