EF Core添加迁移生成ColumnName1的额外列

Question

我有以下实体。当我生成迁移时，它会创建两列，名称分别为RestrictedCategoryId和RestrictedCategoryId1(FK(。如何解决这个问题，只生成一列FK？

注意：我需要每个实体中的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 });
}
}

`实体与实际实体相似。

Answer 1

实际上，您得到了两个额外的列：

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

显然，EF核心外键约定不能很好地处理复合键，因此您必须显式配置关系-与您对其他关系所做的类似，只是因为您的模型没有相应的集合导航属性，所以您必须使用具有泛型类型参数和无参数的HasMany，例如在CategoryConfiguration:内部

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