EF Core Add-Migration使用ColumnName1生成额外的列

Question

我在生成迁移时具有以下实体，它会创建两个名为RestrictedCategoryId和RestrictedCategoryId1（FK）的列。如何解决此问题以使用FK仅生成一列？

注意：每个实体中都需要OrderId。

`C＃

public class Order
{
    public Guid Id { get; set; }
    public DateTime OrderDate { get; set; }

    private List<Category> _categories;
    public List<Category> Categories => _categories;
}
public class Category
{
    public Guid Id { get; set; }
    public string Code { get; set; }
    public string Name { get; set; }

    public Guid OrderId { get; set; }
    public Order Order { get; set; }

    private List<RestrictionCategory> _restrictedCategories;
    public List<RestrictionCategory> RestrictedCategories => _restrictedCategories;
}
public class RestrictionCategory
{
    public Guid Id { get; set; }
    public string Name { get; set; }
    public Guid OrderId { get; set; }
    public Order Order { get; set; }
    public Guid CategoryId { get; set; }
    public Category Category { get; set; }        
    public Guid RestrictedCategoryId { get; set; }
    public Category RestrictedCategory { get; set; }
}
public class OrderConfiguration : IEntityTypeConfiguration<Order>
{
    public void Configure(EntityTypeBuilder<Order> builder)
    {
        builder.HasKey(o => o.Id);
        builder.Property(o => o.Id).IsRequired();
    }
}
public class CategoryConfiguration : IEntityTypeConfiguration<Category>
{
    public void Configure(EntityTypeBuilder<Category> builder)
    {
        builder.HasKey(c => new { c.Id, c.OrderId });
        builder.Property(o => o.Id).IsRequired();
        builder.Property(o => o.OrderId).IsRequired();

        builder.HasMany(c => c.RestrictedCategories).WithOne(cr => cr.Category)
            .HasForeignKey(cr => new { cr.CategoryId, cr.OrderId 
}).OnDelete(DeleteBehavior.NoAction);
    }
}
public class RestrictionCategoryConfiguration : IEntityTypeConfiguration<RestrictionCategory>
{
    public void Configure(EntityTypeBuilder<RestrictionCategory> builder)
    {
        builder.HasKey(c => new { c.Id, c.OrderId });
        builder.Property(o => o.Id).IsRequired();
        builder.Property(o => o.OrderId).IsRequired();

        builder.HasIndex(cr => new { cr.RestrictedCategoryId, cr.OrderId });
    }
}

`这些实体类似于实际的实体。

Answer 1

实际上您会获得另外两列：

RestrictedCategoryId = table.Column<Guid>(nullable: false),
RestrictedCategoryId1 = table.Column<Guid>(nullable: true), // <--
RestrictedCategoryOrderId = table.Column<Guid>(nullable: true) // <--

显然EF Core Foreign Key Conventions在复合键上不能很好地发挥作用，因此您必须显式配置该关系-类似于您对其他关系所做的操作，只是因为您的模型没有相应的集合导航属性，因此必须使用HasMany具有泛型类型参数，无参数，例如在CategoryConfiguration内：

builder.HasMany<RestrictionCategory>()
    .WithOne(cr => cr.RestrictedCategory)
    .HasForeignKey(cr => new { cr.RestrictedCategoryId, cr.OrderId})
    .OnDelete(DeleteBehavior.NoAction);