NHibernate - 根据子属性筛选出结果

Question

我有这段代码获取所有已启用的组及其子代。我的问题是，孩子们也可以被禁用，但我不能得到流利的nhibernate只获取全部儿童被启用的组。我认为这是可能的，但如何？

public class Group { 
    public bool IsDisabled { get; set; } 
    public string Description { get; set; } 
    public ICollection<ChildType> Children { get; protected set; } 
} 

public class ChildType { 
    public bool IsDisabled { get; set; } 
    public string Description { get; set; } 
} 

public IList<Group> Search(string searchString) { 
    IQueryOver<Group> query = Session.QueryOver<Group>() 
     .WhereRestrictionOn(x => x.Description).IsInsensitiveLike(searchString, MatchMode.Start) 
     .Where(x => !x.IsDisabled) 
     .OrderBy(x => x.Description).Asc 
     .Fetch(group => group.Children).Eager; 

    return query 
     .Cacheable() 
     .List(); 
} 

编辑：有一个N：儿童和群体之间的M-关系。

以下是我使用的解决方案：

public class Group { 
    public long Id { get; set; } 
    public bool IsDisabled { get; set; } 
    public string Description { get; set; } 
    public ICollection<ChildType> Children { get; protected set; } 
} 

public class ChildType { 
    public long Id { get; set; } 
    public bool IsDisabled { get; set; } 
    public string Description { get; set; } 
    public ICollection<Group> Groups { get; protected set; } 
} 

public IList<Group> Search(string searchString) { 
    ChildType child = null; 
    Group group = null; 
    Group joinedGroup = null; 

    var notDisabled = Session.QueryOver.Of<ExaminationType>() 
     .Where(x => x.IsDisabled) 
     .JoinAlias(x => x.Groups,() => joinedGroup) 
      .Where(x => joinedGroup == group) 
     .Select(x => x.Id); 

    IQueryOver<Group> query = Session.QueryOver<Group>() 
     .WhereRestrictionOn(x => x.Description).IsInsensitiveLike(searchString, MatchMode.Start) 
     .JoinAlias(x => x.ExaminationTypes,() => child) 
     .WithSubquery.WhereNotExists(notDisabled) 
     .OrderBy(x => x.Description).Asc; 

    return query 
     .Cacheable() 
     .List(); 
} 

Answer 1

您需要使用子查询，以达到你想要的。为了做到这一点，虽然你需要添加一个Group引用到ChildType实体。

Group group = null; 
var childCrit = QueryOver.Of<ChildType>() 
     .Where(c => c.Group == group).And(c => c.IsDisabled) 
     .Select(c => c.Id); 
var query = Session.QueryOver(() => group) 
     .WhereRestrictionOn(x => x.Description).IsInsensitiveLike(searchString, MatchMode.Start) 
     .Where(x => !x.IsDisabled) 
     .WithSubquery.WhereNotExists(childCrit) 
     .OrderBy(x => x.Description).Asc 
     .Fetch(group => group.Children).Eager; 

这将得到所有没有被禁用且没有禁用子项的组。

Answer 2

public IList<Group> Search(string searchString) { 

    Children children = null; 

    IQueryOver<Group> query = Session.QueryOver<Group>() 
     .WhereRestrictionOn(x => x.Description).IsInsensitiveLike(searchString, MatchMode.Start) 
     .Where(x => !x.IsDisabled) 
     .JoinAlias(x => x.Children,() => children) 
      .Where(x => !x.IsDisabled) 
     .OrderBy(x => x.Description).Asc; 

    return query 
     .Cacheable() 
     .List(); 
} 

这应该做你想做的事。

加入别名也会为您取回。

http://www.philliphaydon.com/2011/04/nhibernate-querying-relationships-are-depth/