4
我读过RavenDB的Ayende的blog post on the multi map feature,并试图实现它。我无法让它通过。我有什么是基本相同的博客文章的例子:在RavenDb中有多重映射/减少工作吗?
class RootDocument {
public string Id { get; set; }
public string Foo { get; set; }
public string Bar { get; set; }
}
public class ChildDocument {
public string Id { get; set; }
public string RootId { get; set; }
public int Value { get; set; }
}
class RootsByIdIndex: AbstractMultiMapIndexCreationTask<RootsByIdIndex.Result> {
public class Result {
public string Id { get; set; }
public string Foo { get; set; }
public string Bar { get; set; }
public int Value { get; set; }
}
public RootsByIdIndex() {
AddMap<ChildDocument>(children => from child in children
select new {
Id = child.RootId,
Foo = (string)null,
Bar = (string)null,
Value = child.Value
});
AddMap<RootDocument>(roots => from root in roots
select new {
Id = root.Id,
Foo = root.Foo,
Bar = root.Bar,
Value = 0
});
Reduce = results => from result in results
group result by result.Id into g
select new {
Id = g.Key,
Foo = g.Select(x => x.Foo).Where(x => x != null).First(),
Bar = g.Select(x => x.Bar).Where(x => x != null).First(),
Value = g.Sum(x => x.Value)
};
}
}
查询在索引总是给我的价值属性的值0。有一点摆弄索引使得看起来ChildDocument的地图从不检索任何文档。
这个工作应该在当前稳定的RavenDB构建(1.0.573)中吗?还是我做错了?