NHibernate映射异常:来自表dbo.AccountGroup的关联引用了一个未映射的类:System.String

Question

我收到此错误:

表dbo.AccountGroup中的关联引用了未映射的类:System.String

这是我的实体:

public class AccountGroup
{
    public virtual int Id { get; private set; }
    public virtual string Name { get; set; }
    public virtual string Parent { get; set; }
    public virtual string Description { get; set; }
    public virtual IList<Account> Accounts { get; set; }

    public AccountGroup()
    {
        this.Accounts = new List<Account>();
    }
}

public class Account
{
    public virtual int Id { get; private set; }
    public virtual string Code { get; set; }
    public virtual string Name { get; set; }
    public virtual string Description { get; set; }
    public virtual int Category { get; set; }
    public virtual AccountGroup Group { get; set; }
    public virtual IList<LedgerEntry> LedgerEntries { get; set; }

    public Account()
    {
        this.LedgerEntries = new List<LedgerEntry>();
    }
}

这是我的映射:

    public AccountGroupMap()
    {
        Table("dbo.AccountGroup");
        Id(x => x.Id)
            .Column("Id");
        Map(x => x.Name);
        References(x => x.Parent)
            .Column("Parent");
        Map(x => x.Description);
        HasMany(x => x.Accounts)
            .KeyColumn("GroupId")
            .Inverse()
            .Cascade.All();
    }
}

    public AccountMap()
    {
        Table("dbo.Account");
        Id(x => x.Id)
            .Column("Id");
        Map(x => x.Code);
        Map(x => x.Name);
        Map(x => x.Description);
        Map(x => x.Category);
        References(x => x.Group)
            .Column("AccountGroupId");
        HasMany(x => x.LedgerEntries)
            .KeyColumn("AccountId")
            .Inverse()
            .Cascade.All();
    }

这是我的表格:

CREATE TABLE AccountGroup(Id int PRIMARY KEY,Name varchar(20),Parent int,Description varchar(20))

CREATE TABLE帐户(Id int PRIMARY KEY,Code varchar(30),Name varchar(20),Description varchar(20),Category int,AccountGroupId int,FOREIGN KEY(AccountGroupId)REFERENCES AccountGroup(Id))

Answer 1

你有

References(x => x.Parent)
        .Column("Parent");

当Parent被定义为

public virtual string Parent { get; set; }

你不能引用一个字符串(除非它是一个集合元素)