Mapreduce 通过对文档上的嵌套值应用谓词进行RavenDb分面搜索
在RavenDB中,我理解当您需要计算符合特定标准的属性时,这是可以实现的Mapreduce 通过对文档上的嵌套值应用谓词进行RavenDb分面搜索,mapreduce,ravendb,faceted-search,Mapreduce,Ravendb,Faceted Search,在RavenDB中,我理解当您需要计算符合特定标准的属性时,这是可以实现的 通过针对要分组的属性名称创建面 然后在上述属性和where子句中所需的属性上创建索引 最后使用上述索引发出查询。以及使用ToFacets扩展实现查询 但是,当where子句恰好包含一个针对文档上值集合的属性的谓词时,会发生什么情况呢?因为如果我将集合中的嵌套属性添加到父文档的索引中,父文档中属性的方面计数将不准确 例如 public class Camera { string Make { get;set; }
public class Camera {
string Make { get;set; }
string Model { get;set; }
double Price { get;set; }
IEnumerable<string> Showrooms { get;set; }
}
公共类摄像机{
字符串Make{get;set;}
字符串模型{get;set;}
双倍价格{get;set;}
IEnumerable展厅{get;set;}
}
我的查询看起来像(from camera in session.Query<Camera, Camera_Facets>()
where camera.Price < 100 && camera.ShowRooms.Any(s => s.In("VIC", "ACT", "QLD"))
select new {
camera.Make,
camera.Model,
camera.Price}
).ToFacets("facets/CameraFacets");
(来自会话中的摄影机。查询()
其中camera.Price<100&&camera.shourrooms.Any(s=>s.In(“VIC”、“ACT”、“QLD”))
选择新{
照相机,制造,
相机,模型,
相机价格}
).ToFacets(“刻面/摄像机”);
更新:
这是失败的测试
[TestFixture]
public class FacetedSearchWhenQueryingNestedCollections
{
public class Car
{
public Car()
{
Locations = new List<string>();
}
public string Id { get; set; }
public string Make { get; set; }
public string Model { get; set; }
public double Price { get; set; }
public IEnumerable<string> Locations { get; set; }
}
public class Car_Facets : AbstractIndexCreationTask<Car>
{
public Car_Facets()
{
Map = cars => from car in cars
select new {car.Make, car.Model, car.Price};
}
}
private static IDocumentSession OpenSession
{
get { return new EmbeddableDocumentStore {RunInMemory = true}.Initialize().OpenSession(); }
}
[Test]
public void CanGetFacetsWhenQueryingNesetedCollectionValues()
{
var cars = Builder<Car>.CreateListOfSize(50)
.Section(0, 10)
.With(x => x.Model = "Camry")
.With(x => x.Make = "Toyota")
.With(x => x.Price = 2000)
.With(x => x.Locations = new[] {"VIC", "ACT"})
.Section(11, 20)
.With(x => x.Model = "Corolla")
.With(x => x.Make = "Toyota")
.With(x => x.Price = 1000)
.With(x => x.Locations = new[] { "NSW", "ACT" })
.Section(21, 30)
.With(x => x.Model = "Rx8")
.With(x => x.Make = "Mazda")
.With(x => x.Price = 5000)
.With(x => x.Locations = new[] { "ACT", "SA", "TAS" })
.Section(31, 49)
.With(x => x.Model = "Civic")
.With(x => x.Make = "Honda")
.With(x => x.Price = 1500)
.With(x => x.Locations = new[] { "QLD", "SA", "TAS" })
.Build();
IDictionary<string, IEnumerable<FacetValue>> facets;
using(var s = OpenSession)
{
s.Store(new FacetSetup { Id = "facets/CarFacets", Facets = new List<Facet> { new Facet { Name = "Model" }, new Facet { Name = "Make" }, new Facet { Name = "Price" } } });
s.SaveChanges();
IndexCreation.CreateIndexes(typeof(Car_Facets).Assembly, s.Advanced.DocumentStore);
foreach (var car in cars)
s.Store(car);
s.SaveChanges();
s.Query<Car, Car_Facets>().Customize(x => x.WaitForNonStaleResults()).ToList();
facets = s.Query<Car, Car_Facets>()
.Where(x => x.Price < 3000)
.Where(x => x.Locations.Any(l => l.In("QLD", "VIC")))
.ToFacets("facets/CarFacets");
}
Assert.IsNotNull(facets);
Assert.IsTrue(facets.All(f => f.Value.Count() > 0));
Assert.IsTrue(facets.All(f => f.Value.All(x => x.Count > 0)));
}
[TearDown]
public void ClearData()
{
using(var s = OpenSession)
{
foreach (var car in s.Query<Car>().ToList())
s.Delete(car);
s.SaveChanges();
}
}
}
[TestFixture]
公共类FacetedSearchWhenQueryingNestedCollections
{
公车
{
公共汽车
{
位置=新列表();
}
公共字符串Id{get;set;}
公共字符串Make{get;set;}
公共字符串模型{get;set;}
公共双价{get;set;}
公共IEnumerable位置{get;set;}
}
公共类汽车方面:AbstractIndexCreationTask
{
公共汽车
{
地图=汽车=>从汽车中的汽车
选择new{car.Make,car.Model,car.Price};
}
}
私有静态IDocumentSession OpenSession
{
获取{return new embeddedabledocumentstore{RunInMemory=true}.Initialize().OpenSession();}
}
[测试]
查询NeseedCollectionValues()时的公共无效存储面
{
var cars=Builder.CreateListOfSize(50)
.第(0、10)节
.带有(x=>x.Model=“凯美瑞”)
.With(x=>x.Make=“丰田”)
(x=>x.价格=2000)
.With(x=>x.Locations=new[]{“VIC”,“ACT”})
.第(11、20)条
.With(x=>x.Model=“Corolla”)
.With(x=>x.Make=“丰田”)
.有(x=>x.价格=1000)
.With(x=>x.Locations=new[]{“NSW”,“ACT”})
.第(21、30)条
.With(x=>x.Model=“Rx8”)
.带有(x=>x.Make=“马自达”)
.有(x=>x.价格=5000)
.With(x=>x.Locations=new[]{“ACT”、“SA”、“TAS”})
.第(31、49)条
.With(x=>x.Model=“Civic”)
.带有(x=>x.Make=“本田”)
.有(x=>x.价格=1500)
.With(x=>x.Locations=new[]{“QLD”、“SA”、“TAS”})
.Build();
词典方面;
使用(var s=OpenSession)
{
s、 存储(新FacetSetup{Id=“facets/CarFacets”,facets=newlist{newfacet{Name=“Model”},newfacet{Name=“Make”},newfacet{Name=“Price”}});
s、 保存更改();
CreateIndexes(typeof(Car_Facets).Assembly,s.Advanced.DocumentStore);
foreach(车辆中的var车辆)
s、 商店(汽车);
s、 保存更改();
s、 Query().Customize(x=>x.WaitForNonStaleResults()).ToList();
facets=s.Query()
.其中(x=>x.价格<3000)
.其中(x=>x.Locations.Any(l=>l.In(“QLD”、“VIC”))
.ToFacets(“镶嵌面/镶嵌面”);
}
Assert.IsNotNull(facets);
IsTrue(facets.All(f=>f.Value.Count()>0));
IsTrue(facets.All(f=>f.Value.All(x=>x.Count>0));
}
[撕裂]
public void ClearData()
{
使用(var s=OpenSession)
{
foreach(s.Query().ToList()中的var car)
s、 删除(car);
s、 保存更改();
}
}
}
但如果我将我的查询更改为。(不再查询嵌套集合)
facets=s.Query()
.其中(x=>x.价格<3000)
.ToFacets(“镶嵌面/镶嵌面”);
现在我在字典中得到了3个枚举,都有值。如果我将索引更改为
public class Car_Facets : AbstractIndexCreationTask<Car>
{
public Car_Facets()
{
Map = cars => from car in cars
from location in car.Locations
select new {car.Make, car.Model, car.Price, Location = location};
}
}
然后查询为
facets = s.Query<Car, Car_Facets>().AsProjection<CarOnLocation>()
.Where(x => x.Price < 3000)
.Where(x => x.Location.In("QLD", "VIC"))
.ToFacets("facets/CarFacets");
facets=s.Query().AsProjection()
.其中(x=>x.价格<3000)
.Where(x=>x.Location.In(“QLD”、“VIC”))
.ToFacets(“镶嵌面/镶嵌面”);
它起作用了 这实际上应该工作得很好,你真的看到这个返回错误的结果吗?你有一个失败的测试要发布吗?@AyendeRahien我已经更新了这个问题以提供一个失败的测试。
public class CarOnLocation
{
public string Make { get; set; }
public string Model { get; set; }
public double Price { get; set; }
public string Location { get; set; }
}
facets = s.Query<Car, Car_Facets>().AsProjection<CarOnLocation>()
.Where(x => x.Price < 3000)
.Where(x => x.Location.In("QLD", "VIC"))
.ToFacets("facets/CarFacets");