Question

我正在 MySql 上使用 Castle Active Record 和 NHibernate 实现一个相对简单的用户管理模型，我遇到了一个问题。

我们说，我有两个表_ 用户和_ 密码由以下SQL创建语句描述

CREATE TABLE _users (
  id bigint(20) NOT NULL AUTO_INCREMENT,
  username char(32) NOT NULL,
  PRIMARY KEY (id),
  UNIQUE KEY username_UQ (username),
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

CREATE TABLE _passwords (
  id bigint(20) NOT NULL AUTO_INCREMENT,
  creation_date datetime NOT NULL,
  user_id bigint(20) NOT NULL,
  password_hash char(64) NOT NULL,
  valid_end_date datetime NOT NULL,
  PRIMARY KEY (id),
  UNIQUE KEY user_id_password_UQ (user_id,password_hash),
  KEY user_passwords_FK (user_id),
  CONSTRAINT user_passwords_FK FOREIGN KEY (user_id) REFERENCES _users (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

这个想法是保留一个原始密码历史记录，因此，密码保存在一个单独的表_ 密码中，它与_ 用户具有多对一的关系 table。

现在，以下C＃代码使用Castle Active Records

对此结构进行建模

namespace DataEntities
{
    [ActiveRecord("_users")]
    public class User : ActiveRecordBase<User>
    {
        [PrimaryKey(PrimaryKeyType.Identity, "id", Access = PropertyAccess.NosetterLowercase)]
        public ulong Id
        {
            get;
            set;
        } // Id

        [Property("username", ColumnType = "String", NotNull = true, Unique = true)]
        [ValidateIsUnique]
        public string Username
        {
            get;
            set;
        } // Username

        [HasMany(typeof(Password))]
        public IList<Password> Passwords
        {
            get;
            set;
        } // Passwords

        public string ValidPasswordHash
        {
            get
            {
                DateTime l_dtNow = DateTime.Now;
                if (Passwords.Count != 1 || Passwords[0].ValidFrom >= l_dtNow || Passwords[0].ValidUntil <= l_dtNow)
                {
                    throw new Exception();
                }

                return Encoding.UTF8.GetString(Passwords[0].PasswordHash);
            }
        } // ValidPasswordHash

        public static User FindByCredentials(string i_sUsername, string i_sHashedPassword)
        {
            return FindOne(Restrictions.Eq("Username", i_sUsername), Restrictions.Eq("ValidPasswordHash", i_sHashedPassword));
        } // FindByCredentials
    } // User

    [ActiveRecord("_passwords")]
    public class Password : ActiveRecordBase<Password>
    {
        [PrimaryKey(PrimaryKeyType.Identity, "id", Access = PropertyAccess.NosetterLowercase)]
        public ulong Id
        {
            get;
            set;
        } // Id

        [BelongsTo("user_id", NotNull = true, UniqueKey = "_passwords_UQ1")]
        public ulong UserId
        {
            get;
            set;
        } // UserId

        [Property("password_hash", ColumnType = "UInt64", NotNull = true, UniqueKey = "_passwords_UQ1")]
        public byte[] PasswordHash
        {
            get;
            set;
        } // PasswordHash

        [Property("creation_date", ColumnType = "DateTime", NotNull = true)]
        public DateTime ValidFrom
        {
            get;
            set;
        } // ValidFrom

        [Property("valid_end_date", ColumnType = "DateTime", NotNull = true)]
        public DateTime ValidUntil
        {
            get;
            set;
        } // ValidUntil
    } // Password
} // DataEntities

并在我的应用程序启动框架初始化

try
{
    ActiveRecordStarter.Initialize(ActiveRecordSectionHandler.Instance, typeof(Password),
                                                                        typeof(User));
}
catch (Exception l_excpt)
{
    // handle exception
}

最后，当此代码运行时，它会生成以下异常：

Castle.ActiveRecord.Framework.ActiveRecordException: ActiveRecord tried to infer details about the relation User.Passwords but it could not find a 'BelongsTo' mapped property in the target type DataEntities.Password
   at Castle.ActiveRecord.Framework.Internal.SemanticVerifierVisitor.VisitHasMany(HasManyModel model) in c:\daten\dev\External\Castle\AR2.0\ActiveRecord\Castle.ActiveRecord\Framework\Internal\Visitors\SemanticVerifierVisitor.cs:line 544
   at Castle.ActiveRecord.Framework.Internal.AbstractDepthFirstVisitor.VisitNodes(IEnumerable nodes) in c:\daten\dev\External\Castle\AR2.0\ActiveRecord\Castle.ActiveRecord\Framework\Internal\Visitors\AbstractDepthFirstVisitor.cs:line 45
   at Castle.ActiveRecord.Framework.Internal.AbstractDepthFirstVisitor.VisitModel(ActiveRecordModel model) in c:\daten\dev\External\Castle\AR2.0\ActiveRecord\Castle.ActiveRecord\Framework\Internal\Visitors\AbstractDepthFirstVisitor.cs:line 59
   at Castle.ActiveRecord.Framework.Internal.SemanticVerifierVisitor.VisitModel(ActiveRecordModel model) in c:\daten\dev\External\Castle\AR2.0\ActiveRecord\Castle.ActiveRecord\Framework\Internal\Visitors\SemanticVerifierVisitor.cs:line 122
   at Castle.ActiveRecord.Framework.Internal.AbstractDepthFirstVisitor.VisitNodes(IEnumerable nodes) in c:\daten\dev\External\Castle\AR2.0\ActiveRecord\Castle.ActiveRecord\Framework\Internal\Visitors\AbstractDepthFirstVisitor.cs:line 45
   at Castle.ActiveRecord.ActiveRecordStarter.RegisterTypes(ISessionFactoryHolder holder, IConfigurationSource source, IEnumerable`1 types, Boolean ignoreProblematicTypes) in c:\daten\dev\External\Castle\AR2.0\ActiveRecord\Castle.ActiveRecord\Framework\ActiveRecordStarter.cs:line 927
   at Castle.ActiveRecord.ActiveRecordStarter.Initialize(IConfigurationSource source, Type[] types) in c:\daten\dev\External\Castle\AR2.0\ActiveRecord\Castle.ActiveRecord\Framework\ActiveRecordStarter.cs:line 202
   at Global.Application_Start(Object sender, EventArgs e) in C:\Projects Code\xyz\Global.asax.cs:line 22

好吧，我已经无休止地盯着UserId课程的Password属性，我用Google搜索，现在我很失落。所以社区是我最后的希望......任何人都可以帮助我理解导致此异常的原因以及如何解决这个问题？

提前感谢您的回复和评论。

Answer 1

您应该使用User User { get; set; }引用属性而不是外键。

official docs是一个很好的起点。

Castle Active Record无法初始化

1 个答案: