SQLite扩展异常：ManyToOne关系目标必须具有主键

Question

您可以在标题中看到错误。 有我的表类：发生

public class Cars : Table 
{ 
    [NotNull] 
    public string name { get; set; } 
    [ForeignKey(typeof(Models)), NotNull] 
    public int model_out_id { get; set; } 
    [ForeignKey(typeof(Bodies)), NotNull] 
    public int body_out_id { get; set; } 
    [MaxLength(50)] 
    public string vin { get; set; } 
    [MaxLength(4), NotNull] 
    public int year { get; set; } 
    [Indexed, NotNull] 
    public long created_at { get; set; } = DateTime.Now.GetTimestamp(); 

    [ManyToOne(CascadeOperations = CascadeOperation.CascadeRead)] 
    public Models Model { get; set; } 
    [ManyToOne(CascadeOperations = CascadeOperation.CascadeRead)] 
    public Bodies Body { get; set; } 

    [OneToMany] 
    public List<CarGlasses> CarGlasses { get; set; } 

    public Cars() 
    { 
    } 
} 

public class Models : TableLibrary 
{ 
    [PrimaryKey, NotNull] 
    public int out_id { get; set; } 
    [NotNull] 
    public string name { get; set; } 
    [ForeignKey(typeof(Marks)), NotNull] 
    public int mark_out_id { get; set; } 
    [Indexed, NotNull] 
    public int year_from { get; set; } 
    [Indexed] 
    public int? year_to { get; set; } 

    [ManyToOne(CascadeOperations = CascadeOperation.CascadeRead), Ignore] 
    public Marks Mark { get; set; } 

    public Models() 
    { 
    } 
} 

错误的位置：

inst.GetChild(car, "Model"); 

inst是SQLite.Net.SQLiteConnection例如，当我用库作为明码

一切工作正常，但现在我增加一条，作为PCL参考。正如您可以看到在Models表中存在PrimaryKey。这段代码有什么问题？

Answer 1

这是我在xamarin论坛上的帖子。那里有解决方案。

https://forums.xamarin.com/discussion/comment/288455