我有以下RavenDB索引。
public class MyDomain_WeeklyPerYear : AbstractIndexCreationTask<Entities.MyDomain, MyDomain_YearlyTotals.Result>
{
public class Result
{
public int ProcessWeek { get; set; }
public int ProcessYear { get; set; }
public int Total { get; set; }
public object Weeks { get; set; }
public string Workspace { get; set; }
}
public MyDomain_WeeklyPerYear()
{
Map = data => data
.Select(x => new
{
x.ProcessWeek,
x.ProcessYear,
x.Workspace,
Total = 1,
Weeks = (List<object>) null
});
Reduce = results => results
.GroupBy(x => x.ProcessYear)
.OrderBy(x => x.Key)
.Select(x => new
{
ProcessWeek = 0,
ProcessYear = x.Key,
Workspace = (string) null,
Total = 0,
Weeks = x
.GroupBy(y => y.ProcessWeek)
.OrderBy(y => y.Key)
.Select(y => new
{
Week = y.Key,
Total = y.Sum(z => z.Total)
})
.ToList()
});
}
}
使用以下查询运行它时，得到以下结果。
var data = await Session
.Query<MyDomain_WeeklyPerYear.Result, MyDomain_WeeklyPerYear>()
.ToListAsync();
[
{
"processWeek": 0,
"processYear": 2012,
"total": 0,
"weeks": [
{
"Week": 1,
"Total": 8
},
{
"Week": 49,
"Total": 4
},
{
"Week": 50,
"Total": 6
},
{
"Week": 51,
"Total": 11
},
{
"Week": 52,
"Total": 4
}
],
"workspace": null
},
{
"processWeek": 0,
"processYear": 2013,
"total": 0,
"weeks": [
{
"Week": 0,
"Total": 0
}
],
"workspace": null
},
{
"processWeek": 0,
"processYear": 2014,
"total": 0,
"weeks": [
{
"Week": 0,
"Total": 0
}
],
"workspace": null
},
{
"processWeek": 0,
"processYear": 2015,
"total": 0,
"weeks": [
{
"Week": 0,
"Total": 0
}
],
"workspace": null
},
{
"processWeek": 0,
"processYear": 2016,
"total": 0,
"weeks": [
{
"Week": 0,
"Total": 0
}
],
"workspace": null
},
{
"processWeek": 0,
"processYear": 2017,
"total": 0,
"weeks": [
{
"Week": 0,
"Total": 0
}
],
"workspace": null
},
{
"processWeek": 0,
"processYear": 2018,
"total": 0,
"weeks": [
{
"Week": 0,
"Total": 0
}
],
"workspace": null
},
{
"processWeek": 0,
"processYear": 2019,
"total": 0,
"weeks": [
{
"Week": 2,
"Total": 14
},
{
"Week": 3,
"Total": 30
},
{
"Week": 4,
"Total": 42
},
{
"Week": 5,
"Total": 52
},
{
"Week": 6,
"Total": 51
},
{
"Week": 7,
"Total": 39
},
{
"Week": 8,
"Total": 53
},
{
"Week": 9,
"Total": 47
},
{
"Week": 10,
"Total": 52
}
],
"workspace": null
}
]
数据的结构是我想要的正确JSON结构，但似乎丢失了许多数据。我在2012年和2019年得到了结果（正确）。但是其他年份是空的，即使我100％确定它们所存储的数据比2012年和2019年要多得多。
当我将减少值更改为以下内容（删除了第二个.Select()）：
Reduce = results => results
.GroupBy(x => x.ProcessYear)
.OrderBy(x => x.Key)
.Select(x => new
{
ProcessWeek = 0,
ProcessYear = x.Key,
Workspace = (string) null,
Total = 0,
Weeks = x
.GroupBy(y => y.ProcessWeek)
.OrderBy(y => y.Key)
.ToList()
});
结果是这样的结构很奇怪（请参阅一小段关于2013的打击，因为完整的JSON很长）。
[
{
... other years
},
{
"processWeek": 0,
"processYear": 2013,
"total": 0,
"weeks": [
{
"ProcessWeek": 0,
"ProcessYear": 2013,
"Workspace": null,
"Total": 0,
"Weeks": [
[
{
"ProcessWeek": 7,
"ProcessYear": 2013,
"Workspace": "my-workspace",
"Total": 1,
"Weeks": null
},
{
"ProcessWeek": 7,
"ProcessYear": 2013,
"Workspace": "my-workspace",
"Total": 1,
"Weeks": null
},
{
"ProcessWeek": 7,
"ProcessYear": 2013,
"Workspace": "my-workspace",
"Total": 1,
"Weeks": null
},
{
"ProcessWeek": 7,
"ProcessYear": 2013,
"Workspace": "my-workspace",
"Total": 1,
"Weeks": null
},
{
"ProcessWeek": 7,
"ProcessYear": 2013,
"Workspace": "my-workspace",
"Total": 1,
"Weeks": null
},
{
"ProcessWeek": 7,
"ProcessYear": 2013,
"Workspace": "my-workspace",
"Total": 1,
"Weeks": null
},
{
"ProcessWeek": 7,
"ProcessYear": 2013,
"Workspace": "my-workspace",
"Total": 1,
"Weeks": null
},
{
"ProcessWeek": 7,
"ProcessYear": 2013,
"Workspace": "my-workspace",
"Total": 1,
"Weeks": null
},
{
"ProcessWeek": 7,
"ProcessYear": 2013,
"Workspace": "my-workspace",
"Total": 1,
"Weeks": null
},
{
"ProcessWeek": 7,
"ProcessYear": 2013,
"Workspace": "my-workspace",
"Total": 1,
"Weeks": null
},
{
"ProcessWeek": 7,
"ProcessYear": 2013,
"Workspace": "my-workspace",
"Total": 1,
"Weeks": null
},
{
"ProcessWeek": 7,
"ProcessYear": 2013,
"Workspace": "my-workspace",
"Total": 1,
"Weeks": null
},
{
"ProcessWeek": 7,
"ProcessYear": 2013,
"Workspace": "my-workspace",
"Total": 1,
"Weeks": null
},
{
"ProcessWeek": 7,
"ProcessYear": 2013,
"Workspace": "my-workspace",
"Total": 1,
"Weeks": null
},
{
"ProcessWeek": 7,
"ProcessYear": 2013,
"Workspace": "my-workspace",
"Total": 1,
"Weeks": null
}
],
[
{
"ProcessWeek": 12,
"ProcessYear": 2013,
"Workspace": "my-workspace",
"Total": 1,
"Weeks": null
},
{
"ProcessWeek": 12,
"ProcessYear": 2013,
"Workspace": "my-workspace",
"Total": 1,
"Weeks": null
},
{
"ProcessWeek": 12,
"ProcessYear": 2013,
"Workspace": "my-workspace",
"Total": 1,
"Weeks": null
},
]
]
}
]
},
{
... other years
}
]
您可以看到2013年有数据，即使在第一个JSON结果中它没有显示它，但它具有我没想到的奇怪结构。我认为，这可能就是为什么它没有在第一次减少中显示2013年数据的原因。
我的问题：
我已经在这个问题上停留了很长时间，希望能得到一些帮助。
RavenDB Client: 4.1.4
RavenDB Server: 4.1.3
答案 0 :(得分：2)
问题是您在reduce中创建虚假数据，但是reduce被多次调用。您必须能够递归处理它。 尝试这样的事情：
public MyDomain_WeeklyPerYear()
{
Map = data => data
.Select(x => new
{
x.ProcessYear,
Weeks = new [] {
new {Week = x.ProcessWeek, Total = 1}
}
});
Reduce = results => results
.GroupBy(x => x.ProcessYear)
.Select(x => new
{
ProcessYear = x.Key,
Weeks = x.SelectMany(y=>y.Weeks)
.GroupBy(y => y.ProcessWeek)
.Select(y => new
{
Week = y.Key,
Total = y.Sum(z => z.Total)
})
});
}