ABP.IO WEB應用程式框架取得關聯資料 include

2022-10-25

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ABP
2024-03-14

定義關聯屬性來使用倉儲WithDetailsAsync 方法取得關聯資料

預設載入關聯實體

EntityFrameworkCoreModule

Configure<AbpEntityOptions>(options =>
{
    options.Entity<Blog>(orderOptions =>
    {
        orderOptions.DefaultWithDetailsFunc = 
            query => query.Include(o => o.Posts);
    });
});

BlogAppService

var q = await _blogRepository.WithDetailsAsync();

var entity = await AsyncExecuter.FirstAsync(q);

這樣使用時就不用再指定 WithDetailsAsync(x => x.Posts)

var entity = await _blogRepository.GetAsync();

使用 GetAsync 時會直接包含Posts

Entity Framework Core | Documentation Center | ABP.IO

步驟

首先要在 Entity 定義導覽屬性

Order
public ICollection<OrderLine> Lines { get; set; } //Sub collection
OrderLine
[JsonIgnore] public Order Order { get; set; } //Navigation property

注意

如果沒加 [JsonIgnore] (System.Text.Json.Serialization) ，API 回傳的時候會報錯
[JsonIgnore] 是 using System.Text.Json.Serialization; 而非 using Newtonsoft.Json; 否則會吃不到設定

JsonException: A possible object cycle was detected. 
This can either be due to a cycle or if the object depth 
is larger than the maximum allowed depth of 32.

如果FK不符合命名原則 (OrderId)，則需要在 DbContext 定義關聯

//Define the relation
b.HasMany(x => x.Lines)
    .WithOne(x => x.Order)
    .HasForeignKey(x => x.NotOrderIdButIsFkId)
    .IsRequired();

最後就可以透過倉儲取得

//Get a IQueryable<T> by including sub collections
var queryable = await _orderRepository.WithDetailsAsync(x => x.Lines);

//Apply additional LINQ extension methods
var query = queryable.Where(x => x.Id == id);

//Execute the query and get the result
var order = await AsyncExecuter.FirstOrDefaultAsync(query);

沒意外了話，order 裡面會包含 Line 的集合資料

[Fact]
public async Task Should_Get_Details_From_A_Order()
{
    var orderManager = GetRequiredService<orderManager>();
	
    //Act
    var result = await WithUnitOfWorkAsync(async () => 
        await orderManager.WithDetailsAsync()};

    //Assert
    result.ShouldNotBeNull();
    result.Lines.ShouldNotBeNull();
    result.Lines.Count.ShouldBeGreaterThan(0);
}

多層關聯 [Include(A).ThenInclude(B)]

//Get a IQueryable<T> by including sub collections
var queryable = await _orderRepository.WithDetailsAsync(
    x => x.Lines,
    x => x.Lines.Providers);

//Apply additional LINQ extension methods
var query = queryable.Where(x => x.Id == id);

//Execute the query and get the result
var result = await AsyncExecuter.ToListAsync(query, cancellationToken);

複數關聯 [Include(A).Include(C)]

//Get a IQueryable<T> by including sub collections
var queryable = await _orderRepository.WithDetailsAsync(
    x => x.Lines,
    x => x.Details);

//Apply additional LINQ extension methods
var query = queryable.Where(x => x.Id == id);

//Execute the query and get the result
var result = await AsyncExecuter.ToListAsync(query, cancellationToken);