索引基类ravendb的所有派生类

Question

Our project has a framework and an own code base, which implements entities of the framework.

The idea is also to have several indexes in the framework that will return the results of all inheritances of certain framework types like user.

Apparantly, the only way Raven supports this (without creating the index on the highest level and manually adding maps) is to store all objects in the same collection by overwriting the Clr-type. However, this means we lose the derived information and cannot query on it.

Some samples:

class A { 
    public string Id {get; set; }, 
    public string Name {get; set; } 
}
class B : A { }
class C : A { }
class D : C { } 

Then I want to query something along the lines of:

store.Query<IndexOfA>().Where(a => a.Name == "foo").As<A>().ToList();

AND be able to still do this;

store.Query<IndexOfC>().As<C>().ToList()

My idea was to add a convention that saves both the derived and the base class to the metadata when storing documents in RavenDB, but I have no idea how to go about this and cannot find any documentation on the subject.

Any ideas?

Answer 1

You can create an index that used a multi map index with AddMapForAll<Base> , which will generate a separate entry for each derived class. You could then use that index to do polymorphic queries.