BusinessLogic.Logic.GameDefinitions.GameDefinitionRetriever.AddPlayersToChampionData C# (CSharp) Метод

        private void AddPlayersToChampionData(List<GameDefinitionSummary> gameDefinitionSummaries)
        {
            var playerIds = gameDefinitionSummaries.Select(x => x.Champion == null ? -1 : x.Champion.PlayerId).ToList()
                                                   .Union(gameDefinitionSummaries.Select(x => x.PreviousChampion?.PlayerId ?? -1).ToList());

            var players = _dataContext.GetQueryable<Player>().Where(player => playerIds.Contains(player.Id)).ToList();

            foreach (var gameDefinitionSummary in gameDefinitionSummaries)
            {
                if (gameDefinitionSummary.Champion != null)
                {
                    gameDefinitionSummary.Champion.Player = players.FirstOrDefault(player => player.Id == gameDefinitionSummary.Champion.PlayerId);
                }

                if (gameDefinitionSummary.PreviousChampion != null)
                {
                    gameDefinitionSummary.PreviousChampion.Player = players.FirstOrDefault(player => player.Id == gameDefinitionSummary.PreviousChampion.PlayerId);
                }
            }
        }