RavenDB static index on dictionary - ravendb

Question

I have an application that uses documents, that contain list of attributes in a dictionary, for some reason we need to use a static index and query/filter over these attributes.
A prototype looks like this:
class Program
{
static void Main(string[] args)
{
IDocumentStore store = new DocumentStore() { DefaultDatabase = "Test", Url = "http://localhost:8081" };
store.Initialize();
IndexCreation.CreateIndexes(typeof(Program).Assembly, store);
using (var session = store.OpenSession())
{
session.Store(new Document { Id = "1", Name = "doc_name", Attributes = new Dictionary<string, object> { { "Type", "1" }, { "Status", "Active" } } });
session.SaveChanges();
}
using (var session = store.OpenSession())
{
// works
var l1 = session.Query<Document, Documents_Index>().Where(a => a.Attributes["Type"] == "1").ToList();
// not working
var l2 = session.Query<Document, Documents_Index>().Where(a => a.Attributes["Status"] == "Active").ToList();
}
}
}
public class Documents_Index : AbstractIndexCreationTask<Document>
{
public Documents_Index()
{
Map = docs => docs.Select(a =>
new
{
a.Name,
a.Attributes,
Attributes_Type = a.Attributes["Type"]
});
}
}
[Serializable]
public class Document
{
public string Id { get; set; }
public string Name { get; set; }
public Dictionary<string, object> Attributes { get; set; }
}
But since I need to query using any arbitrary Attribute name/value this index does solve our problem. Actually the list of attributes is known at run-time (so we tried modifying the Map expression to inject any number of attribute names, but so far we weren't successful). Is there a way how to define the index in some dynamic fashion?

Answer 1

You need to write it like:
public class Documents_Index : AbstractIndexCreationTask<Document>
{
public Documents_Index()
{
Map = docs => docs.Select(a =>
new
{
a.Name,
_ = a.Attributes.Select(x=>CreateField("Attributes_"+x.Key, x.Value),
});
}
}