linq_functions_1.cs

Db.Translations.GroupJoin(
                    db.StateVariations,
                    translation => translation.Id,
                    variation => variation.TranslationId,
                    (translation, variation) => new { translation, variations = variation })
                    .Select(x => new CombinedDataObject
                    {
                        Id = x.translation.Id,
                        EN = x.translation.EN,
                        Variations = Mapper(x.variations),
                    });