[英]EF Core: how to specify foreign key in one-way relationships
I'm using the Entity Framework Core 6
fluent API to configure my database schema in a .NET Core
project.我正在使用Entity Framework Core 6
fluent API 在.NET Core
项目中配置我的数据库模式。
When declaring two-way relationships we can easily specify the foreign key like this:在声明双向关系时,我们可以很容易地指定外键,如下所示:
modelBuilder.Entity<Foo>()
.HasMany(x => x.Bars)
.WithOne(x => x.Foo)
.HasForeignKey(x => x.FooId);
However, if we have a one-way only relationship like this:但是,如果我们有这样的单向关系:
modelBuilder.Entity<Foo>()
.HasOne(x => x.Bar);
I don't understand how to specify the foreign key, since the .HasOne
method does not return an object that has the .HasForeignKey()
method.我不明白如何指定外键,因为.HasOne
方法不返回具有.HasForeignKey()
方法的 object。
How do you specify the foreign key in these cases?在这些情况下如何指定外键?
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