lucene - 使用 RavenDb/Lucene 的分面搜索中的分层分类法？

Question

我正在考虑使用 RavenDb 来实现“高级分面搜索”场景。
在支持全文搜索和所有其他基本功能的同时，我必须处理复杂的分层分类法和跨树不同分支的共享方面。

是否有任何资源记录如何使用 RavenDb API 执行此操作？

关于这个主题的极其复杂的论文:Beyond Basic Faceted Search
Solr的方式:HierarchicalFaceting

Answer 1

最后..

using System.Collections.Generic;
using System.Linq;
using NUnit.Framework;
using Raven.Abstractions.Data;
using Raven.Client;
using Raven.Client.Document;
using Raven.Client.Indexes;
using Raven.Client.Linq;

namespace Prototype.Search.Tests
{
    [TestFixture]
    public class HierarchicalFaceting
    {
        //
        // Document definition
        //
        public class Doc
        {
            public Doc()
            {
                Categories = new List<string>();
            }

            public int Id { get; set; }
            public List<string> Categories { get; set; }
        }

        //
        // Data sample
        //
        public IEnumerable<Doc>  GetDocs()
        {
            yield return new Doc { Id = 1, Categories = new List<string> { "0/NonFic", "1/NonFic/Law"} };
            yield return new Doc { Id = 2, Categories = new List<string> { "0/NonFic", "1/NonFic/Sci" } };
            yield return new Doc { Id = 3, Categories = new List<string> { "0/NonFic", "1/NonFic/Hist", "1/NonFic/Sci", "2/NonFic/Sci/Phys" } };
        }

        //
        // The index
        //
        public class DocByCategory : AbstractIndexCreationTask<Doc, DocByCategory.ReduceResult>
        {
            public class ReduceResult
            {
                public string Category { get; set; }
            }

            public DocByCategory()
            {
                Map = docs =>
                      from d in docs
                      from c in d.Categories
                      select new
                                 {
                                     Category = c
                                 };
            }
        }

        //
        // FacetSetup
        //
        public FacetSetup GetDocFacetSetup()
        {
            return new FacetSetup
                       {
                           Id = "facets/Doc",
                           Facets = new List<Facet>
                                        {
                                            new Facet
                                                {
                                                    Name = "Category"
                                                }
                                        }
                       };
        }

        [SetUp]
        public void SetupDb()
        {
            IDocumentStore store = new DocumentStore()
            {
                Url = "http://localhost:8080"
            };
            store.Initialize();
            IndexCreation.CreateIndexes(typeof(HierarchicalFaceting).Assembly, store);

            var session = store.OpenSession();
            session.Store(GetDocFacetSetup());
            session.SaveChanges();

            store.Dispose();
        }

        [Test]
        [Ignore]
        public void DeleteAll()
        {
            IDocumentStore store = new DocumentStore()
            {
                Url = "http://localhost:8080"
            };
            store.Initialize();

            store.DatabaseCommands.DeleteIndex("Raven/DocByCategory");
            store.DatabaseCommands.DeleteByIndex("Raven/DocumentsByEntityName", new IndexQuery());

            store.Dispose();
        }

        [Test]
        [Ignore]
        public void StoreDocs()
        {
            IDocumentStore store = new DocumentStore()
            {
                Url = "http://localhost:8080"
            };
            store.Initialize();

            var session = store.OpenSession();

            foreach (var doc in GetDocs())
            {
                session.Store(doc);
            }

            session.SaveChanges();
            session.Dispose();
            store.Dispose();
        }

        [Test]
        public void QueryDocsByCategory()
        {
            IDocumentStore store = new DocumentStore()
            {
                Url = "http://localhost:8080"
            };
            store.Initialize();

            var session = store.OpenSession();

            var q = session.Query<DocByCategory.ReduceResult, DocByCategory>()
                .Where(d => d.Category == "1/NonFic/Sci")
                .As<Doc>();

            var results = q.ToList();
            var facetResults = q.ToFacets("facets/Doc").ToList();

            session.Dispose();
            store.Dispose();
        }

        [Test]
        public void GetFacets()
        {
            IDocumentStore store = new DocumentStore()
            {
                Url = "http://localhost:8080"
            };
            store.Initialize();

            var session = store.OpenSession();

            var q = session.Query<DocByCategory.ReduceResult, DocByCategory>()
                .Where(d => d.Category.StartsWith("1/NonFic"))
                .As<Doc>();

            var results = q.ToList();
            var facetResults = q.ToFacets("facets/Doc").ToList();

            session.Dispose();
            store.Dispose();
        }
    }
}