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我正在试图插入数据库。我有以下两个实体:流利的nHibernate的“非空属性引用空值或瞬态值”与外键
USER:
public class User
{
private UserDescription _userDescription;
public virtual uint Id { get; set; }
public virtual string Email { get; set; }
public virtual string Username { get; set; }
public virtual UserDescription UserDescription
{
get { return _userDescription; }
set { _userDescription = value; }
}
public virtual void Add(UserDescription userDescription)
{
if (_userDescription != null)
{
_userDescription.User = null;
}
_userDescription = userDescription;
_userDescription.User = this;
}
public class UserMap : ClassMap<User>
{
public UserMap()
{
Table("users");
Id(x => x.Id).GeneratedBy.Identity();
Map(x => x.Email).Not.Nullable();
Map(x => x.Username).Not.Nullable();
HasOne(x => x.UserDescription).Cascade.All().LazyLoad();
}
}
}
而且USERDESCRIPTION:
public class UserDescription
{
public virtual uint Id { get; set; }
public virtual User User { get; set; }
public virtual uint UserId { get; set; }
public virtual string Firstname { get; set; }
public virtual string Lastname { get; set; }
public class UserDescrptionMap : ClassMap<UserDescription>
{
public UserDescrptionMap()
{
Table("usersdescription");
Id(x => x.Id).GeneratedBy.Identity();
Map(x => x.UserId);
Map(x => x.Firstname);
Map(x => x.Lastname);
HasOne(x => x.User).Constrained().ForeignKey();
}
}
}
我的JSON我通过如下所示:
{
"Email": "[email protected]",
"Username": "Something123",
"UserDescription": {
"Firstname": "John",
"Lastname": "Doe"
}
}
我试图做一个插入到用户希望它会级联下来,并插入到子表UserDescription,但没有奏效。所以相反,我先插入用户然后插入UserDescription(不知道这是否是理想的)。
无论如何,我得到以下错误,当我尝试插入UserDescription后,我成功地插入到用户:
非空属性引用null或瞬时值Users.Entities.UserDescription.User
有什么建议吗?