Linq distinct record containing keywords

Question

I need to return a distinct list of records based on a car keywords search like: \"Alfa 147\"

The problem is that, as I have 3 \"Alfa\" cars, it returns 1 + 3 records (i

Answer 1

Fiuu, this was brain-wreck. I splited query in several pieces, but it's executed as a whole at the end (var result). And I returned anonymous class, but intention is clear.

Here is the solution:

var keywordIds = from k in keywordQuery
                    where splitKeywords.Contains(k.Name)
                    select k.Id;

var matchingKac = from kac in keywordAdCategories
            where keywordIds.Contains(kac.Keyword_Id)
            select kac;

var addIDs = from kac in matchingKac
                group kac by kac.Ad_Id into d
                where d.Count() == splitKeywords.Length
                select d.Key;

var groupedKac = from kac in keywordAdCategoryQuery
                where addIDs.Contains(kac.Ad_Id)
                group kac by new { kac.Category_Id, kac.Ad_Id };

var result = from grp in groupedKac
                group grp by grp.Key.Category_Id into final
                join c in categoryQuery on final.Key equals c.Id
                select new
                {
                    Id = final.Key,
                    Name = c.Name,
                    SearchCount = final.Count()
                };

// here goes result.ToList() or similar