Question

我有一个向DbSet添加对象的问题。

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();

以下是我的关系配置：

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“DatabaseContext.SaveChanges（）”抛出异常：

INSERT语句与FOREIGN KEY约束冲突 “FK_dbo.Sentence_dbo.Word_WordId”。冲突发生在数据库中 “tempDatabase”，表“dbo.Word”，列“Id”。声明有已被终止。

以下Word对象的一切正常：

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

我做错了什么？你能救我吗？

Answer 1

您的sentence模型看起来已发生变化，因为当word引用translation时，add-migration具有外键，请尝试运行update-database检查是否要查看更改并{{1}}（如果您使用代码优先迁移）

实体框架6 - 添加包含其他子项的子项的父项

1 个答案: