Linq2db 关联为空

Question

我有 2 个域实体、成员和主题设置。一个成员可以有 0 或 1 个主题设置，我已经使用 Fluentmapping 进行了设置：

public class Member(int id, Guid externalId, string name, string email, ThemeSettings? settings) : AggregateRoot(id)
{
    public Guid ExternalId { get; private set; } = externalId;
    public string Name { get; private set; } = name;
    public string Email { get; private set; } = email;

    // Associations
    public ThemeSettings? ThemeSettings { get; set; } = settings;
}

public class ThemeSettings(
    int id,
    int memberId,
    Theme theme,
    SidebarPosition sidebarPosition,
    SidebarBehavior sidebarBehavior,
    bool sidebarCompact) : Entity(id)
{
    public int MemberId { get; private set; } = memberId;
    public Theme Theme { get; set; } = theme;
    public SidebarPosition SidebarPosition { get; set; } = sidebarPosition;
    public SidebarBehavior SidebarBehavior { get; set; } = sidebarBehavior;
    public bool SidebarCompact { get; set; } = sidebarCompact;
}


builder
            .Entity<Member>()
            .HasSchemaName("Member")
            .HasTableName("Member")
            .Property(e => e.Id).IsPrimaryKey().IsIdentity().HasColumnName("Id")
            .Property(e => e.Code).IsNotNull().HasColumnName("Code")
            .Property(e => e.ExternalId).IsNotNull().HasColumnName("ExternalId")
            .Property(e => e.Name).IsNotNull().HasColumnName("Name")
            .Property(e => e.Email).IsNotNull().HasColumnName("Email")
            .Property(e => e.ThemeSettings)
            .Association(e => e.ThemeSettings, e => e.Id, c => c!.MemberId, true);


builder
            .Entity<ThemeSettings>()
            .HasSchemaName("Member")
            .HasTableName("ThemeSettings")
            .Property(e => e.Id).IsPrimaryKey().IsIdentity().HasColumnName(nameof(Entity.Id))
            .Property(e => e.Code).IsNotNull().HasColumnName("Code")
            .Property(e => e.MemberId).HasColumnName("MemberId")
            .Property(e => e.Theme).HasConversion(v => (int)v, v => (Theme)v).HasColumnName(nameof(ThemeSettings.Theme))
            .Property(e => e.SidebarBehavior).HasConversion(v => (int)v, v => (SidebarBehavior)v)
            .HasColumnName(nameof(ThemeSettings.SidebarBehavior))
            .Property(e => e.SidebarPosition).HasConversion(v => (int)v, v => (SidebarPosition)v)
            .HasColumnName(nameof(ThemeSettings.SidebarPosition))
            .Property(e => e.SidebarCompact).HasColumnName(nameof(ThemeSettings.SidebarCompact));

然后我在主题设置上使用 LoadWith 查询成员。我看到查询已正确生成并返回 1 行，正如预期的那样：

DECLARE @externalId UniqueIdentifier -- Guid
SET     @externalId = 'd4cee0e2-6341-43c0-93c8-f1acad44195a'

SELECT
    [member_1].[Id],
    [member_1].[Code],
    [member_1].[ExternalId],
    [member_1].[Name],
    [member_1].[Email],
    [a_ThemeSettings].[Id],
    [a_ThemeSettings].[Code],
    [a_ThemeSettings].[MemberId],
    [a_ThemeSettings].[Theme],
    [a_ThemeSettings].[SidebarPosition],
    [a_ThemeSettings].[SidebarBehavior],
    [a_ThemeSettings].[SidebarCompact]
FROM
    [Member].[Member] [member_1]
        LEFT JOIN [Member].[ThemeSettings] [a_ThemeSettings] ON [member_1].[Id] = [a_ThemeSettings].[MemberId]
WHERE
    [member_1].[ExternalId] = @externalId


[07:41:42 Information] LinqToDB.Data.DataConnection
Query Execution Time (AfterExecute): 00:00:00.0015098


[07:41:42 Information] LinqToDB.Data.DataConnection
Total Execution Time (Completed): 00:00:00.0018493. Rows Count: 1.

它正确地为我初始化了 Member 对象，但由于某种原因，ThemeSettings 属性仍然为 null。我无法弄清楚我做错了什么，有什么想法吗？如果我在数据库上手动运行此查询，数据是正确的并且包含该成员的有效主题设置值。

数据使用存储库和规范加载，其中包含以下内容：

public async Task<IEnumerable<T>> GetBySpecificationAsync(ISpecification<T> spec)
{
    var query = db.GetTable<T>().Where(spec.Criteria);

    query = spec.Includes.Aggregate(query,
        (current, include) => current.LoadWith(include));
    return await query.ToListAsync();
}

public class MemberByExternalIdSpecification(Guid externalId)
    : Specification<Domain.MemberAggregate.Member>(
        member => member.ExternalId == externalId,
        i => i.ThemeSettings);
    

规范基础初始值设定项中的第二行是在存储库中处理的包含数组。

有什么想法吗？

Answer 1

如果有人想知道，我忽略了 linq2db 使用主构造函数并使用参数名称来传递数据的事实。 ThemeSettings 参数的名称必须从 settings 固定为 themeSettings。

感谢 @Svyatoslav Danyliv 在 linq2db 问题部分向我指出这一点：https://github.com/linq2db/linq2db/issues/4478

public class Member(int id, Guid externalId, string name, string email, ThemeSettings? themeSettings) : AggregateRoot(id)
{
    public Guid ExternalId { get; private set; } = externalId;
    public string Name { get; private set; } = name;
    public string Email { get; private set; } = email;

    // Associations
    public ThemeSettings? ThemeSettings { get; set; } = settings;
}