EF 6：包含不构建导航属性

Question

我似乎无法弄清楚为什么我的导航属性不能通过我的include语句构建。

这里是我的方法：

public async Task<IHttpActionResult> GetCompanies(string id) 
    { 
     DbContext.Database.Log = s => System.Diagnostics.Debug.WriteLine(s); 
     var company = await DbContext.Companies.Where(x => x.Id.ToString() == id).Include(x => x.StartelAccounts).FirstOrDefaultAsync(); 

     if (company != null) 
     { 
      return Ok(this.TheModelFactory.Create(company)); 
     } 

     return NotFound(); 
    } 

当我测试从调试日志中我得到的所有字段和值两个对象的SQL。

下面是型号：

public class CompanyGroup 
{ 
    [Key] 
    public Guid Id { get; set; } 

    [Required] 
    [MaxLength(100)] 
    public string Name { get; set; } 

    [Required] 
    [DataType(DataType.Date)] 
    public DateTime FirstBillingDate { get; set; } 

    [Required] 
    public int TermLength { get; set; } 

    public virtual ICollection<ApplicationUser> Members { get; set; } 
    public virtual ICollection<AccountStartel> StartelAccounts { get; set; } 

    public CompanyGroup() 
    { 
     Members = new HashSet<ApplicationUser>(); 
     StartelAccounts = new HashSet<AccountStartel>(); 
    } 

} 
public class AccountStartel 
{ 

    [Key] 
    public Guid Id { get; set; } 

    [Required] 
    public string ClientID { get; set; } 

    [Required] 
    public int DbId { get; set; } 

    [Required] 
    public string Name { get; set; } 

    [Required] 
    public string TimeZone { get; set; } 

    [Required] 
    public string AccountNum { get; set; } 

    public Guid CompanyId { get; set; } 

    public virtual CompanyGroup Company { get; set; } 

    public virtual ICollection<UsageReport> UsageReports { get; set; } 

    public AccountStartel() 
    { 
     Company = new CompanyGroup(); 
     CompanyId = Guid.Empty; 
     UsageReports = new List<UsageReport>(); 
    } 
} 

EF流利的API

modelBuilder.Entity<AccountStartel>() 
      .HasRequired<CompanyGroup>(x => x.Company) 
      .WithMany(x => x.StartelAccounts) 
      .HasForeignKey(x => x.CompanyId); 

     modelBuilder.Entity<AccountStartel>() 
      .Property(p => p.DbId) 
      .IsRequired() 
      .HasColumnAnnotation(
       IndexAnnotation.AnnotationName, 
       new IndexAnnotation(
        new System.ComponentModel.DataAnnotations.Schema.IndexAttribute("IX_StartelDbId", 1) { IsUnique = true })); 

有人能看到我在想念着什么吗？

Answer 1

难道它需要在 AccountStartel构造函数中设置公司和/或CompanyId？如果你删除这些行，它会起作用吗？ - Peter

将导航属性初始化为默认值导致EF无法正确加载它们。

这里是更新的模型，做现在的工作

public class AccountStartel 
{ 

    [Key] 
    public Guid Id { get; set; } 

    [Required] 
    public string ClientID { get; set; } 

    [Required] 
    public int DbId { get; set; } 

    [Required] 
    public string Name { get; set; } 

    [Required] 
    public string TimeZone { get; set; } 

    [Required] 
    public string AccountNum { get; set; } 

    public Guid CompanyId { get; set; } 

    public CompanyGroup Company { get; set; } 

    public virtual ICollection<UsageReport> UsageReports { get; set; } 

    public AccountStartel() 
    { 
     UsageReports = new List<UsageReport>(); 
    } 
}