json

            var teamsWithFootballers = context.Teams
                .ToList()
                .Where(x => x.TeamsFootballers.Any(x => x.Footballer.ContractStartDate >= date))
                .Select(x => new
                {
                    Name = x.Name,
                    Footballers = x.TeamsFootballers
                    .Where(f => f.Footballer.ContractStartDate >= date)
                    .OrderByDescending(f => f.Footballer.ContractEndDate)
                    .ThenBy(f => f.Footballer.Name)
                    .Select(f => new
                    {
                        FootballerName = f.Footballer.Name,
                        ContractStartDate = f.Footballer.ContractStartDate.ToString("d", CultureInfo.InvariantCulture),
                        ContractEndDate = f.Footballer.ContractEndDate.ToString("d", CultureInfo.InvariantCulture),
                        BestSkillType = f.Footballer.BestSkillType.ToString(),
                        PositionType = f.Footballer.PositionType.ToString()
                    }).ToList()
                })
                .OrderByDescending(x => x.Footballers.Count)
                .ThenBy(x => x.Name)
                .Take(5)
                .ToList();

            return JsonConvert.SerializeObject(teamsWithFootballers, Formatting.Indented);