?? ??? ?? ??? ?? DTO ??? ???? ??? EF Core?? ???? ? ????

Entity Framework Core??? ?? ???? ???? DTO ??? ??? ? ????. ? ??? ??? ??:

public class Model
{
    public int ModelId { get; set; }
    public string ModelName { get; set; }

    public virtual ICollection<ChildModel> ChildModels { get; set; }

    // Other properties, collections, etc.

    public static Expression<Func<Model, ModelDto>> AsDto =>
        model => new ModelDto
        { 
            ModelId = model.ModelId,
            ModelName = model.ModelName,
            ChildModels = model.ChildModels.AsQueryable().Select(ChildModel.AsDto).ToList()
        };
}

? ??:

dbContext.Models.Where(m => SomeCriteria).Select(Model.AsDto).ToList();

?? ??? ??? ?? ? ?? ?? ???? ?? ? ?????. ??? ??? ?????. ??? ??? ? ????? ???? ?? ?? ???? ?? ??? ??? ? ????? ?? ??, Model ???? ?? ??? ???? ?? ??:

public AnotherChildModel AnotherChildModel { get; set; }

???? ??? ??? ? ????:

public static Expression<Func<Model, ModelDto>> AsDto =>
    model => new ModelDto
    { 
        ModelId = model.ModelId,
        ModelName = model.ModelName,
        ChildModels = model.ChildModels.AsQueryable().Select(ChildModel.AsDto).ToList(),
        AnotherChildModel = new AnotherChildModelDto
        {
            AnotherChildModelId = model.AnotherChildModelId
        }
    };

??? ? ?? ?? ??? ??? ??? ? ??? ?????. DTO ??? ???? ?? ????? ????. ?? ???? .Select()? ???? ?? ??? ?????

???

?? ?????? ? ??? ?? ???? ???? ?????.

1. LINQKit:
LINQKit? ???? ExpandableAttribute? ???? .Select() ??? ?? ???? ??? ? ????.

[Expandable(nameof(AsDtoImpl))]
public static ModelDto AsDto(Model model)
{
   _asDtoImpl ??= AsDtoImpl() .Compile();
   return _asDtoImpl(model);
}

private static Func<Model, ModelDto> _asDtoImpl;

private static Expression<Func<Model, ModelDto>> AsDtoImpl =>
    model => new ModelDto
    { 
        ModelId = model.ModelId,
        ModelName = model.ModelName,
        ChildModels = model.ChildModels.AsQueryable().Select(ChildModel.AsDto).ToList(),
        AnotherChildModel = new AnotherChildModelDto
        {
            AnotherChildModelId = model.AnotherChildModelId
        }
    };

?? ?? ??? ??? ?? ??? ? ????.

dbContext.Models
   .Where(m => SomeCriteria).Select(m => Model.AsDto(m))
   .AsExpandable()
   .ToList();

2. NeinLinq:
LINQKit? ???? NeinLinq? InjectLambda ??? ?????.

[InjectLambda]
public static ModelDto AsDto(Model model)
{
   _asDto ??= AsDto() .Compile();
   return _asDto(model);
}

private static Func<Model, ModelDto> _asDto;

private static Expression<Func<Model, ModelDto>> AsDto =>
    model => new ModelDto
    { 
        ModelId = model.ModelId,
        ModelName = model.ModelName,
        ChildModels = model.ChildModels.AsQueryable().Select(ChildModel.AsDto).ToList(),
        AnotherChildModel = new AnotherChildModelDto
        {
            AnotherChildModelId = model.AnotherChildModelId
        }
    };

??? ??? ?? ??? ? ????.

dbContext.Models
   .Where(m => SomeCriteria).Select(m => Model.AsDto(m))
   .ToInjectable()
   .ToList();

3. DelegateDecompiler:
DelegateDecompiler? Computed ??? ???? ??? ?? ??? ?????.

[Computed]
public static ModelDto AsDto(Model model)
  => new ModelDto
    { 
        ModelId = model.ModelId,
        ModelName = model.ModelName,
        ChildModels = model.ChildModels.AsQueryable().Select(ChildModel.AsDto).ToList(),
        AnotherChildModel = new AnotherChildModelDto
        {
            AnotherChildModelId = model.AnotherChildModelId
        }
    }

??? ??? ?? ???? ? ????.

dbContext.Models
   .Where(m => SomeCriteria).Select(m => Model.AsDto(m))
   .Decompile()
   .ToList();

? ?????? ??? ?????. EF Core ?? ?? ? ??? ???? ???? ??? ???? ????. ?? ? ?? ?? ?? IQueryProvider? ????? ??? ?????.

? ??? ?? ???? ??? ?? DTO? ???? ?? EF ?? ??? ????? ???? ? ????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!