添加 - 迁移一个列名称会多次列出

Question

我创建了所有模型,然后添加了一个新的迁移Add-Migration Initial.

添加迁移会在迁移文件夹中创建一个预期的迁移文件,但由于某种原因,它创建了一个名为client_idtwo 的列.我期望创建一个名为client_id整数类型但不可为空的列.

我应该注意,该列client_id引用了Clients具有关系的模型.

这是我的模型类的样子

[Table("scripter_campaigns")]
public class Campaign
{
    [Key]
    [Column(Order = 1)]
    public int id { get; set; }

    [Column(Order = 2)] 
    [StringLength(200)]
    [Required]
    [MinLength(5, ErrorMessage = "The title must be greater than 5 characters  in length"), 
     MaxLength(200)] 
    public string name { get; set; }

     [Column(Order = 3)] 
    [StringLength(200)]
    public string layout { get; set; }

     [Column(Order = 4)] 
    [StringLength(200)] 
    public string call_list_server_name { get; set; }

     [Column(Order = 5)] 
    [StringLength(200)] 
    public string call_list_table_name { get; set; }

    [StringLength(200)] 
    public string status { get; set; }


    public string intro_url { get; set; }
    public string use_transfer { get; set; }
    public string route_callback_to { get; set; }
    public string call_list_database_name { get; set; }
    public int client_id { get; set; }

    public DateTime? created_at { get; set; }
    public DateTime? modified_at { get; set; }

    public virtual Client Client { get; set; }
    //Initilize the default value

    public Campaign()
    {
        status = "Active";
        use_transfer = "No";
        route_callback_to = "Self"; 
    }

}

但它为迁移脚本中的up()方法生成了此代码

    CreateTable(
        "dbo.scripter_campaigns",
        c => new
            {
                id = c.Int(nullable: false, identity: true),
                name = c.String(nullable: false, maxLength: 200),
                layout = c.String(maxLength: 200),
                call_list_server_name = c.String(maxLength: 200),
                call_list_table_name = c.String(maxLength: 200),
                status = c.String(maxLength: 200),
                intro_url = c.String(),
                use_transfer = c.String(),
                route_callback_to = c.String(),
                call_list_database_name = c.String(),
                client_id = c.Int(nullable: false),
                created_at = c.DateTime(),
                modified_at = c.DateTime(),
                Client_id = c.Int(),
            })
        .PrimaryKey(t => t.id)
        .ForeignKey("dbo.clients", t => t.Client_id)
        .Index(t => t.Client_id);

我不明白Client_id = c.Int()从哪里来,但是当我尝试更新数据库时它会引起我的问​​题

这是错误

每个表中的列名必须是唯一的.表'scripter_campaigns'中的列名'Client_id'被多次指定.

另外,数据库中的外键是否需要我能够在我的对象之间建立关系？

Answer 1

Client_id = c.Int() 正在创建因为 public virtual Client Client { get; set; }

这是因为您需要执行以下操作

[ForeignKey("Client")]
public int client_id { get; set; }       

在实体类中具有以下内容时

public virtual Client Client { get; set; }

这种方式[Table("scripter_campaigns")]将知道client_id来自何处.

更新: [ForeignKey("Client")]指示public int client_id { get; set; }保存来自public virtual Client Client { get; set; }对象的值.赋予该scripter_campaigns对象与Client对象相关.