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我想搜索属于用户（我附近）的内容。我有以下指标定义的，但我没有得到一个合并后的结果集：RavenDB中具有空间索引的多图索引失败
public class Things_ByLocation : AbstractMultiMapIndexCreationTask<Things_ByLocation.ThingsByLocationResult>
{
public class ThingsByLocationResult
{
public string ThingId { get; set; }
public string UserId { get; set; }
public double Latitude { get; set; }
public double Longitude { get; set; }
}
public Things_ByLocation()
{
AddMap<Thing>(things => from t in things
select new
{
ThingId = t.Id,
UserId = (string)null,
Latitude = 0,
Longitude = 0,
_ = (object)null,
});
AddMap<User>(users => from u in users
select new
{
ThingId = (string)null,
UserId = u.Id,
Latitude = u.Latitude,
Longitude = u.Longitude,
_ = SpatialIndex.Generate(u.Latitude, u.Longitude)
});
Reduce = results => from result in results
group result by result.ThingId into g
let userId = g.Select(x => x.UserId).Where(t => !string.IsNullOrWhiteSpace(t)).FirstOrDefault()
let lat = g.Select(x => x.Latitude).Where(t => t != 0).FirstOrDefault()
let lng = g.Select(x => x.Longitude).Where(t => t != 0).FirstOrDefault()
select new
{
ThingId = g.Key,
UserId = userId,
Latitude = lat,
Longitude = lng,
_ = SpatialIndex.Generate(lat, lng)
};
Store(x => x.ThingId, FieldStorage.Yes);
Store(x => x.UserId, FieldStorage.Yes);
}
}
结果是这样的：
{
"ThingId": "Thing/Id26",
"UserId": null,
"Longitude": "0",
"__spatialShape": "0.000000 0.000000"
}
我的模型：
public class User
{
public string Id { get; set; }
public double Latitude { get; set; }
public double Longitude { get; set; }
}
public class Thing
{
public string Id { get; set; }
public double Name { get; set; }
public double Description { get; set; }
public string UserId { get; set; }
}
任何想法，以什么我做错了？如果我将该组切换到用户，则会填充用户部分并且ThingId为空。因此，似乎合并过程失败了。我只是不知道为什么。
这也很奇怪，至于为什么结果显示的是经度，而不是纬度属性。
在RAM中使用RavenDB Build 960。
我意识到我可以将位置变成正常的东西，但这意味着如果用户位置改变了，我将不得不更新潜在的数百个东西。这是首选的NoSql方式吗？
UPDATE
基于Ayende的建议，我现在有以下：
public class Things_ByLocation : AbstractMultiMapIndexCreationTask<Things_ByLocation.ThingsByLocationResult>
{
public class ThingsByLocationResult
{
public string ThingId { get; set; }
public string UserId { get; set; }
public double Latitude { get; set; }
public double Longitude { get; set; }
}
public Things_ByLocation()
{
AddMap<Thing>(things => from t in things
select new
{
ThingId = t.Id,
UserId = (string)null,
Latitude = 0,
Longitude = 0
});
AddMap<User>(users => from u in users
select new
{
ThingId = (string)null,
UserId = u.Id,
Latitude = u.Latitude,
Longitude = u.Longitude
});
Reduce = results => from result in results
group result by result.ThingId into g
select new
{
ThingId = g.Key,
UserId = g.Select(x => x.UserId).Where(x => x != null).FirstOrDefault(),
Latitude = g.Select(x => x.Latitude).Where(t => t != 0).FirstOrDefault(),
Longitude = g.Select(x => x.Longitude).Where(t => t != 0).FirstOrDefault()
};
Store(x => x.ThingId, FieldStorage.Yes);
Store(x => x.UserId, FieldStorage.Yes);
}
}
指数本身：
Map:
docs.Things
.Select(t => new {ThingId = t.__document_id, UserId = (String)null, Latitude = 0, Longitude = 0})
Map:
docs.Users
.Select(u => new {ThingId = (String)null, UserId = u.__document_id, Latitude = ((double)u.Latitude), Longitude = ((double)u.Longitude)})
Reduce:
results
.GroupBy(result => result.ThingId)
.Select(g => new {ThingId = g.Key, UserId = g
.Select(x => x.UserId)
.Where(x => x != null).FirstOrDefault(), Latitude = g
.Select(x => ((double)x.Latitude))
.Where(t => t != 0).FirstOrDefault(), Longitude = g
.Select(x => ((double)x.Longitude))
.Where(t => t != 0).FirstOrDefault()})
产生的投影看起来是这样的：
{
"ThingId": "Thing/Id26",
"UserId": null,
"Latitude": null,
"Longitude": null
}
我在这里似乎在做一些学术上的错误。
我试过了，我已经更新了我原来的问题。还是一个类似的问题。有什么建议么？ – Junto 2012-07-16 08:34:04