private Expression <Func <Game, bool> > GenerateRatingRangePredicate(GameSearchParametersDto gameSearchParametersDto)
{
if (gameSearchParametersDto.MinRating.HasValue && gameSearchParametersDto.MaxRating.HasValue)
{
return(GetMoreThanMinRatingExpression(gameSearchParametersDto.MinRating.Value).And(GetLessThanMaxRatingExpression(gameSearchParametersDto.MaxRating.Value)));
}
if (gameSearchParametersDto.MinRating.HasValue)
{
return(GetMoreThanMinRatingExpression(gameSearchParametersDto.MinRating.Value));
}
if (gameSearchParametersDto.MaxRating.HasValue)
{
return(GetLessThanMaxRatingExpression(gameSearchParametersDto.MaxRating.Value));
}
return(o => true);
Expression <Func <Game, bool> > GetMoreThanMinRatingExpression(int minRating)
{
return(o => o.Rating >= minRating);
}
Expression <Func <Game, bool> > GetLessThanMaxRatingExpression(int maxRating)
{
return(o => o.Rating <= maxRating);
}
}
public async Task <JsonResult> Search(GameSearchParametersDto searchParameters)
{
return(new JsonResult(_gameQueryer.SearchGamesByPredicate(searchParameters)));
}
public IEnumerable <GameDto> SearchGamesByPredicate(GameSearchParametersDto gameSearchParametersDto)
{
var predicate = _predicateGenerator.GeneratePredicate(gameSearchParametersDto).WithAdvancedPredicate(GenerateRatingRangePredicate(gameSearchParametersDto)).Compile();
return(_dataStore.GetGames().Where(predicate).ToGameDtos());
}
