ravendb查詢locationsbyip指數

Question

我有以下兩個類定義：

public class Location : Doc 
{ 
    public string Country { get; set; } 
    public string Region { get; set; } 
    public string City { get; set; } 
    public string PostalCode { get; set; } 
    public Double Latitude { get; set; } 
    public Double Longitude { get; set; } 
    public string MetroCode { get; set; } 
    public string AreaCode { get; set; } 
    public List<IpRange> IpRanges { get; set; } 
} 

和

public class IpRange 
{ 
    public long Start { get; set; } 
    public long End { get; set; } 
} 

我有一個索引定義如下：

public class Locations_ByRange : AbstractIndexCreationTask<Location> 
{ 
    public Locations_ByRange() 
    { 
     Map = locations => 
      from location in locations 
      from range in location.IpRanges 
      select new 
      { 
       range.Start, 
       range.End 
      }; 
    } 
} 

然後我嘗試查詢該指數如下：

var queryable = DocumentSession.Query<IpRange, Locations_ByRange>() 
         .FirstOrDefault(x => x.Start <= reverseIp && x.End >= reverseIp) ?? new IpRange(); 

但是，我在運行查詢時，我遇到了以下錯誤：

Exception Details: System.InvalidCastException: Unable to cast object of type 'Jodolo.Data.Locations.Location' to type 'Jodolo.Data.Locations.IpRange'. 

而且，這裏是堆棧跟蹤：

[InvalidCastException: Unable to cast object of type 'Jodolo.Data.Locations.Location' to type 'Jodolo.Data.Locations.IpRange'.] 
    Raven.Client.Document.InMemoryDocumentSessionOperations.TrackEntity(String key, RavenJObject document, RavenJObject metadata, Boolean noTracking) in c:\Builds\RavenDB-Stable\Raven.Client.Lightweight\Document\InMemoryDocumentSessionOperations.cs:357 
    Raven.Client.Document.SessionOperations.QueryOperation.Deserialize(RavenJObject result) in c:\Builds\RavenDB-Stable\Raven.Client.Lightweight\Document\SessionOperations\QueryOperation.cs:167 
    System.Linq.WhereSelectListIterator`2.MoveNext() +104 
    System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) +381 
    System.Linq.Enumerable.ToList(IEnumerable`1 source) +58 
    Raven.Client.Document.SessionOperations.QueryOperation.Complete() in c:\Builds\RavenDB-Stable\Raven.Client.Lightweight\Document\SessionOperations\QueryOperation.cs:143 
    Raven.Client.Document.AbstractDocumentQuery`2.GetEnumerator() in c:\Builds\RavenDB-Stable\Raven.Client.Lightweight\Document\AbstractDocumentQuery.cs:891 
    System.Linq.Enumerable.FirstOrDefault(IEnumerable`1 source) +152 
    Raven.Client.Linq.RavenQueryProviderProcessor`1.GetQueryResult(IDocumentQuery`1 finalQuery) in c:\Builds\RavenDB-Stable\Raven.Client.Lightweight\Linq\RavenQueryProviderProcessor.cs:1529 
    Raven.Client.Linq.RavenQueryProviderProcessor`1.ExecuteQuery() in c:\Builds\RavenDB-Stable\Raven.Client.Lightweight\Linq\RavenQueryProviderProcessor.cs:1454 
    Raven.Client.Linq.RavenQueryProviderProcessor`1.Execute(Expression expression) in c:\Builds\RavenDB-Stable\Raven.Client.Lightweight\Linq\RavenQueryProviderProcessor.cs:1427 
    Raven.Client.Linq.RavenQueryProvider`1.Execute(Expression expression) in c:\Builds\RavenDB-Stable\Raven.Client.Lightweight\Linq\RavenQueryProvider.cs:155 
    Raven.Client.Linq.RavenQueryProvider`1.System.Linq.IQueryProvider.Execute(Expression expression) in c:\Builds\RavenDB-Stable\Raven.Client.Lightweight\Linq\RavenQueryProvider.cs:198 
    System.Linq.Queryable.FirstOrDefault(IQueryable`1 source, Expression`1 predicate) +287 

。 。 。

我很高興看到這一點，因爲最終我試圖檢索滿足查詢參數的位置文檔。很明顯，我可以在查詢電話變更類型聲明

.Query<Location, Locations_ByRange>() 

但是，我再有麻煩搞清楚如何查詢存儲在索引的字段;因爲沒有爲位置對象定義開始和結束字段。

任何幫助，這將不勝感激。

Answer 1

查詢更改爲：

using Raven.Client; 

... 

var location = session.Query<IpRange, Locations_ByRange>() 
         .Where(x => x.Start <= reverseIp && x.End >= reverseIp) 
         .As<Location>() 
         .FirstOrDefault(); 

在您的索引，你可能需要添加排序提示：

public class Locations_ByRange : AbstractIndexCreationTask<Location, IpRange> 
{ 
    public Locations_ByRange() 
    { 
     Map = locations => 
      from location in locations 
      from range in location.IpRanges 
      select new 
      { 
       range.Start, 
       range.End 
      }; 

     Sort(x => x.Start, SortOptions.Long); 
     Sort(x => x.End, SortOptions.Long); 
    } 
} 

請注意，我在AbstractIndexCreationTask<Location, IpRange>添加的返回類型在頂部。這將對齊類型，以便Sort方法可以找到這些屬性。