Method 'Boolean Contains..' has no supported translation to SQL

Question

i have this in my query:

var results = (from urls in _context.Urls
               join documents in _context.Documents on urls.UrlId equals documents.Documen         


        

Answer 1

You can't just write your own methods and call them from your query expression - the query translator has no idea what that method's meant to do.

You could force the where clause to be executed in .NET after fetching the documents and words, potentially... although obviously that means fetching all the joined data from the database. Would that be okay?

To do that, you'd want something like:

var tmpQuery = (from urls in _context.Urls
                join documents in _context.Documents 
                on urls.UrlId equals documents.DocumentId
                let words = (from words in _context.Words
                             join hits in _context.Hits 
                             on words.WordId equals hits.WordId
                             where hits.DocumentId == documents.DocumentId
                             select words.Text)
                select new { urls, documents, words };

var query = from r in tmpQuery.AsEnumerable()
            let urls = r.urls.ToList()
            let words = r.words.ToList()
            let documents = r.documents.ToList()
            where urls.ResolvedPath.Contains(breakedQuery, 
                                             KeywordParts.Url, part) ||
               documents.Title.Contains(breakedQuery,
                                        KeywordParts.Title, part) ||
               documents.Keywords.Contains(breakedQuery,
                                           KeywordParts.Keywords, part) || 
               documents.Description.Contains(breakedQuery, 
                                              KeywordParts.Description, part) ||
               words.Contains(breakedQuery, KeywordParts.Content, part)
            select new { urls, words, documents };