我正在使用Fluent NHibernate映射现有数据库，并且在尝试填充多对多集合时遇到了问题 . 数据库本身没有使用外键正确设置，这是我遇到的问题的简化示例 .
表：
-
用户
-
团体
-
UsersInGroups
实体类：
public class User
{
public virtual long UserID { get; set; }
public virtual string Name { get; set; }
public virtual IList<Group> Groups { get; set; }
}
public class Group
{
public virtual long GroupID { get; set; }
public virtual string Name { get; set; }
public virtual IList<User> Users { get; set; }
}
public class UserInGroup
{
public virtual User User { get; set; }
public virtual Group Group { get; set; }
#region Fluent NHibernate Composite Key Overrides
public override bool Equals(object obj)
{
if (obj == null)
return false;
var compare = obj as UserInGroup;
if (compare == null)
return false;
return User.UserID == compare.User.UserID &&
Group.GroupID == compare.Group.GroupID;
}
public override int GetHashCode()
{
return (User.UserID + "|" + Group.GroupID).GetHashCode();
}
#endregion
}
映射类：
public class UserMap : ClassMap<User>
{
public UserMap()
{
Table("Users");
Id(x => x.UserID, "UserID").GeneratedBy.Identity();
Map(x => x.Name, "Name");
HasManyToMany(x => x.Groups).Table("UsersInGroups")
.ParentKeyColumn("GroupID")
.ChildKeyColumn("UserID")
.Cascade.All();
}
}
public class GroupMap : ClassMap<Group>
{
public GroupMap()
{
Table("Groups");
Id(x => x.GroupID, "GroupID").GeneratedBy.Identity();
Map(x => x.Name, "Name");
HasManyToMany(x => x.Users).Table("UsersInGroups")
.ParentKeyColumn("UserID")
.ChildKeyColumn("GroupID")
.Inverse();
}
}
public class UserInGroupMap : ClassMap<UserInGroup>
{
public UserInGroupMap()
{
Table("UsersInGroups");
CompositeId().KeyReference(x => x.User, "UserID")
.KeyReference(x => x.Group, "GroupID");
}
}
在我的配置中，我启用了预先加载，HasMany关系似乎工作正常，但HasManyToMany关系返回一个空集合 . 我在集合上尝试了几种不同的Cascade.All（）和Inverse组合，但都没有成功 . 任何帮助将不胜感激，谢谢 .
2 回答