[英]EF Core 1:1 Relation?
The tables i want are looking like this...我想要的桌子看起来像这样......
Identity | Id (PK), Tag
Character | IdentityId (FK, PK), Health
The character table should reference exactly one single row of the identity table... and the identity table should not reference anything else 1:0.字符表应该只引用标识表的一行......并且标识表不应引用任何其他 1:0。
My current model is looking like this...我当前的 model 看起来像这样......
/// <summary>
/// Represents an identity in our database.
/// </summary>
public class Identity {
public long Id { get; set; }
public string Tag { get; set; }
}
/// <summary>
/// Represents an character ingame with all his attributes.
/// </summary>
public class Character {
public Identity Identity { get; set; }
public float Health { get; set; }
}
modelBuilder.Entity<Identity>(entity => {
entity.ToTable("identity");
entity.HasKey(e => e.Id);
});
modelBuilder.Entity<Character>(entity => {
entity.ToTable("character");
// entity.HasKey(e -> e.Identity.Id); DOES NOT WORK
entity.Navigation(character => character.Identity).AutoInclude();
});
The problem with this is that the reference to the identity inside the character does not count as an primary key... neither a foreign key.这样做的问题是对角色内部身份的引用不算作主键……也不是外键。
e -> e.Identity.Id
does not work for some reason and results in an error telling me that this is not possible. e -> e.Identity.Id
由于某种原因不起作用,并导致错误告诉我这是不可能的。
I want that the Identity
inside the Character counts as his primary key, while still being a reference to an row inside the Identity-Table ( Foreign key ).我希望 Character 中的
Identity
算作他的主键,同时仍然是对 Identity-Table(外键)中一行的引用。 The identity table however should not reference the character.然而,身份表不应引用该字符。
Is this possible?这可能吗? If so... how?
如果是这样……怎么办?
You can create a property in your Identity class您可以在您的身份中创建一个属性 class
public class Identity {
public long Id { get; set; }
public string Tag { get; set; }
public Character Character { get; set; }
}
then your model become然后你的 model 变成
modelBuilder.Entity<Identity>()
.HasOne(x => x.Character)
.WithOne(x => x.Identity)
.HasForeignKey<Character>(x => x.YourFkKey);
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