内存Db关系中的C＃实体框架

Question

我有一个简单的API，其中包含三个级别的数据：

帐户>用户>地址

该API已成功加载了用户的地址，但引发了一个异常，该异常确定了客户端与用户之间的关系。

Unhandled Exception: System.InvalidOperationException: Unable to determine the relationship represented by navigation property 'ClientModel.Users' of type 'List<UserModel>'. Either manually configure the relationship, or ignore this property using the '[NotMapped]' attribute or by using 'EntityTypeBuilder.Ignore' in 'OnModelCreating'.

以下是看起来与我相同的模型：

public class ClientModel
{
    public string Id { get; set; }
    public string Type { get; set; }
    public string DisplayName { get; set; }
    public string Email { get; set; }
    public long Phone { get; set; }
    public string Photo { get; set; }
    public string Source { get; set; }
    public string CreatedAt { get; set; }
    public int AccountsCount { get; set; }
    public double AccountsBalance { get; set; }
    public double AccountsBalancePending { get; set; }
    public double AccountsDonations { get; set; }
    public double AccountsBalanceAch { get; set; }
    public double AccountsBalanceIra { get; set; }
    public List<UserModel> Users { get; set; }
    public UserModel Advisor { get; set; }
}

public class UserModel
{
    public string Id { get; set; }
    public string ClientId { get; set; }
    public ClientModel Client { get; set; }
    public string Role { get; set; }
    public bool Primary { get; set; }
    public string Email { get; set; }
    public string Password { get; set; }
    public string Token { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string Photo { get; set; }
    public string Birthday { get; set; }
    public long Phone { get; set; }
    public List<AddressModel> Address { get; set; }
}

public class AddressModel
{
    public string Id { get; set; }  
    public string UserId { get; set; }
    public UserModel User { get; set; }
    public string Street { get; set; }  
    public string StreetSecondary { get; set; }  
    public string City { get; set; }  
    public string State { get; set; }  
    public string Country { get; set; }  
    public string PostalCode { get; set; }  
}

Answer 1

您的关系定义不正确。如何在ClientModel类中实现这种关系。

public List<UserModel> Users { get; set; }
public UserModel Advisor { get; set; }

实体框架会发现这种模棱两可的关系。 应该是一对一或一对多。 可能是您在这里混在一起。 只需删除first或last（根据您的要求）并尝试运行它即可。