Raven-Studio Index is returning different results to C# LINQ Query

问题

I am learning RavenDB (Build 2851, Version 2.5.0 / 6dce79a) from Beginning Raven 2.x and am finding that the Raven-Studio is not filtering correctly.

I have a table of cities in my database, storing their populations, locations etc. I have added an index in the code, using this:

public class Cities_ByPopulation : AbstractIndexCreationTask<City>
{
   public Cities_ByPopulation()
   {
      this.Map = cities => from city in cities 
                           select new { Population = city.Population };

      // Generates as this in the RDBMS
      // docs.Cities.Select(city => new {
      //     Population = city.Population
      // })
   }
}

And registering it with the IndexCreation.CreateIndex(typeof(Cities_ByPopulation).Assembly, documentStore) code.

Problem 1 - Raven Studio is not filtering as expected

Now the index is added to RavenDB, and I run a filter the Population [long] field on the Raven Studio, filtering between 200'000 and 500'000.

As you can see, its pulling back values completely out of the range. I have also tried with Population: [Lx200000 TO Lx500000] but then no results appear.

To verify this I created a dynamic index, but have the same problem:

Problem 2 - LINQ is not filtering at all as expected

In addition to this, I'm finding that even with a raw LINQ query, no data is returned at all!

// RavenStore stores a singleton, 
// so I can share across console apps in this solution
using (var store = RavenStore.GetDocumentStore())
{
    IndexCreation.CreateIndexes(typeof(Cities_ByPopulation).Assembly, store);

    const long MinRange = 200000;
    const long MaxRange = 300000;

    Debug.Assert(MinRange < MaxRange, "Ranges need swapping round!");

    // Get cities using the index
    using (var session = store.OpenSession())
    {
        var cities =
            session.Query<City>("Cities/ByPopulation")
                .Customize(x => x.WaitForNonStaleResults())
                .Where(x => x.Population > MinRange && x.Population < MaxRange);

            Console.WriteLine("Number of normal cities within population range: {0}", cities.Count());
    }

    // Get cities from raw query
    using (var session = store.OpenSession())
    {
        var cities = session.Query<City>().Where(x => x.Population > MinRange && x.Population < MaxRange);

        Console.WriteLine("Number of normal cities within population range: {0}", cities.Count());
    }

    // Output :
    // Number of normal cities within population range: 0
    // Number of normal cities within population range: 0
}

The logging for this query is as follows

Request # 275: GET     -     1 ms - <system>   - 200 - /docs/Raven/Databases/World
Request # 276: HEAD    -     0 ms - World      - 200 - /indexes/Cities/ByPopulation
Request # 277: PUT     -     2 ms - World      - 201 - /indexes/Cities/ByPopulation
Request # 278: GET     -     0 ms - World      - 404 - /docs/Raven/Replication/Destinations
Request # 279: GET     -     6 ms - World      - 200 - /indexes/Cities/ByPopulation?&query=Population_Range%3A%7BLx200000%20TO%20Lx300000%7D&pageSize=0&operationHeadersHash=1690003523
        Query: Population_Range:{Lx200000 TO Lx300000}
        Time: 6 ms
        Index: Cities/ByPopulation
        Results: 0 returned out of 0 total.

Request # 280: GET     -     7 ms - World      - 200 - /indexes/dynamic/Cities?&query=Population_Range%3A%7BLx200000%20TO%20Lx300000%7D&pageSize=0&operationHeadersHash=1690003523
        Query: Population_Range:{Lx200000 TO Lx300000}
        Time: 6 ms
        Index: Cities/ByPopulation
        Results: 0 returned out of 0 total.

Some additional info that may help troubleshooting

The data was imported via the CSV importer.
No objects have been stored from a .NET application, only read.

This may imply that the schemas are not in sync, or the DB isn't sure of the data types yet, as the metadata is {}

Here is the resulting JSON from a document:

[city/1989]
{
  "Name": "Aachen",
  "CountryCode": "D",
  "Province": "Nordrhein Westfalen",
  "Population": 247113,
  "CountryId": "country/1009"
}

and C# class:

public class City
    {
        public string Id { get; set; }
        public string Name { get; set; }
        public string CountryCode { get; set; }
        public long Population { get; set; }
        public string Province { get; set; }
        public string CountryId { get; set; }
    }
}

Another update

I've manually patched the collection with

this['@metadata']['Raven-Clr-Type'] = "Domain.City, Domain"

but this hasn't helped the serializer either.

回答1:

You have to tell Raven, that Population is a number, because all values are stored as text. So in your index-constructor write something like

Sort(x => x.Population , SortOptions.Long);

来源：https://stackoverflow.com/questions/22766400/raven-studio-index-is-returning-different-results-to-c-sharp-linq-query

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