Entity Framework 6 - 添加包含其他子项的子项的父项

Question

我在向 DbSet 添加对象时遇到问题。

class Word
{
    [Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public Guid ID {get;set;}
    public virtual ICollection<Translation> Translations {get;set;}
    public virtual ICollection<Inflection> Inflections {get;set;}
}

class Inflection
{
    [Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public Guid ID {get;set;}
    public virtual Word Word {get;set;}
}

class Translation
{
    [Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public Guid ID {get;set;}
    public virtual Word Word {get;set;}
    public virtual ICollection<Sentence> Sentences {get;set;}
}

class Sentence
{
    [Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public Guid ID {get;set;}
    public virtual Translation Translation {get; set;} 
}

我这样做：

DatabaseContext.UserWord.Add(entity);
DatabaseContext.SaveChanges();

这是我的关系配置：

modelBuilder.Entity<Translation>()
    .HasRequired(x => x.Word)
    .WithMany(x => x.Translations);

modelBuilder.Entity<Inflection>()
    .HasRequired(x => x.Word)
    .WithMany(x => x.Inflections);

modelBuilder.Entity<Sentence>()
    .HasRequired(x => x.Translation)
    .WithMany(x => x.Sentences);

我尝试创建 Word 对象：

{
    "Id": "GUID"
    "Translations": [
        {
            "Id": "GUID",
            "Sentences": [
                {
                    "Id": "GUID",
                }
            ]
        }
    ],
    "Inflections": [
        {
            "Id": "GUID",
        }
    ]
}

但是 "DatabaseContext.SaveChanges()" 抛出异常：

The INSERT statement conflicted with the FOREIGN KEY constraint "FK_dbo.Sentence_dbo.Word_WordId". The conflict occurred in database "tempDatabase", table "dbo.Word", column 'Id'. The statement has been terminated.

以下 Word 对象一切正常：

{
    "Id": "GUID"
    "Translations": [
        {
            "Id": "GUID"
        }
    ],
    "Inflections": [
        {
            "Id": "GUID",
        }
    ]
}

我做错了什么？你能帮帮我吗？

Answer 1

看起来你的 sentence 模型已经改变了，因为它有指向 word 的外键，而它应该引用 translation，请尝试运行 add-migration 检查是否看到更改和 update-database（如果您使用的是代码优先迁移）

Entity Framework 6 - 添加包含其他子项的子项的父项

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