在ABP中从CrudAppService检索子实体 [英] Retrieve child entities from CrudAppService in ABP

问题描述

现成的CrudAppService的GetAll和Get方法不包含子实体.

The GetAll and Get methods of the ready-made CrudAppService don't include child entities.

是否可以修改其行为?

GetAllIncluding会出现问题.它属于一种循环依赖关系.是否有任何Attribute或技巧可以将导航属性排除在序列化之外? [NonSerialized]属性似乎不适用于导航属性.

GetAllIncluding has some problem if the included entity has a navigation property to the parent; it falls into a sort of circular dependency. Is there any Attribute or trick to exclude the navigation property from the serialization? The [NonSerialized] attribute does not seem to be applicable to a navigation property.

PostAppService :

public class PostAppService : CrudAppService<Post, PostDto>, IPostAppService
{
    IRepository<Post> _repository = null;

    public PostAppService(IRepository<Post> repository) : base(repository)
    {
        _repository = repository;
    }

    protected override IQueryable<Post> CreateFilteredQuery(PagedAndSortedResultRequestDto input)
    {
        return _repository.GetAllIncluding(p => p.Items);
    }
}

PostDto :

[AutoMap(typeof(Post))]
public class PostDto : EntityDto
{
    public ICollection<Item> Items { get; set; }
}

发布实体:

[Table("AbpPosts")]
public class Post : FullAuditedEntity<int,User>
{
    public virtual ICollection<Item> Items { get; set; }
}

项目实体:

[Table("AbpItems")]
public class Item : Entity
{
    [ForeignKey("PostId")]
    public Post Post { get; set; }
    public int PostId { get; set; }
}

推荐答案

您必须使用eager-loading.

You have to use eager-loading.

在您的AppService中覆盖CreateFilteredQuery和GetEntityById:

Override CreateFilteredQuery and GetEntityById in your AppService:

public class MyAppService : CrudAppService<ParentEntity, ParentEntityDto>, IMyAppService
{
    public MyAppService(IRepository<ParentEntity> repository)
        : base(repository)
    {
    }

    protected override IQueryable<ParentEntity> CreateFilteredQuery(PagedAndSortedResultRequestDto input)
    {
        return Repository.GetAllIncluding(p => p.ChildEntity);
    }

    protected override ParentEntity GetEntityById(int id)
    {
        var entity = Repository.GetAllIncluding(p => p.ChildEntity).FirstOrDefault(p => p.Id == id);
        if (entity == null)
        {
            throw new EntityNotFoundException(typeof(ParentEntity), id);
        }

        return entity;
    }
}

覆盖这些方法的好处是您继续获得权限检查，计数，

The benefit of overriding these methods is that you continue to get permission checking, counting, sorting, paging and mapping for free.

如果包含的实体具有到父级的导航属性，则

GetAllIncluding会出现问题.它属于一种循环依赖关系.是否有任何Attribute或技巧可以将导航属性从序列化中排除?

GetAllIncluding has some problem if the included entity has a navigation property to the parent; it falls into a sort of circular dependency. Is there any Attribute or trick to exclude the navigation property from the serialization?

在PostDto中返回ItemDto(无导航属性).

Return ItemDto (without navigation property) in PostDto.

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