ExRam.Gremlinq is a simple ORM for Gremlin-enabled graph databases in a very early stage.

Currently, the most common Gremlin steps are supported. Assuming an existing instance of an IGremlinQueryProvider, gremlin queries are fluently built starting with CreateQuery():

IGremlinQueryProvider provider = ...
IGremlinQuery query = provider
    .CreateQuery()
    .V<SomeVertexType>()
    .Has(x => x.SomeProperty == 36);

To map graph element labels to CLR types, a basic fluent schema API is supported.

IGremlinModel model = GremlinModel.Empty
    .AddVertexType<SomeVertexType>()
    .AddVertexType<SomeOtherVertexType>()
    .AddEdgeType<AnEgdeType>()
    .AddEdgeType<AnotherEdgeType>();

The model can then be attached to an existing IGremlinQueryProvider:

var queryProviderWithModel = provider
    .WithModel(model);

Queries will use the class hierarchy from the model to automatically add the correct hasLabel steps to the gremlin-query. Automatic schema creation is vendor specific and currently not supported (help wanted!).

Queries can use the class hierarchy information from an IGremlinModel to support inheritance:

public class SomeBaseVertexType { }

public class SomeInheritedVertexType { }

IGremlinQuery query = provider
    .WithModel(GremlinModel.Empty
        .AddVertexType<SomeBaseVertexType>()
        .AddVertexType<SomeInheritedVertexType>())
    .CreateQuery()
    .V<SomeVertexBaseType>(); //Will include vertices of both `SomeBaseVertexType` and `SomeInheritedVertexType`.

Query results are typically provides as json documents. ExRam.Gremlinq supports mapping json-data to CLR types by adding WithJsonSupport:

 IGremlinQueryProvider jsonSupportingProvider = provider
     .WithJsonSupport();

ExRam.Gremlinq enables you to define the graph element labels for CLR types by means of IGraphElementNamingStrategy.

Currently, a simple binding to the DataStax C#-driver for DSE is provided in a separate project. Given an instance of IDseSession, you can create an IGremlinQueryProvider from it using

 IDseSession session = ...
 IGremlinQueryProvider provider = session
     .CreateQueryProvider(someModel, someNamingStrategy);

This project, the repo, the documentation, just about everything is in an early stage. We at @ExRam are currently evaluating graph databases (more specifically DataStax Enterprise Graph). This work in progress reflects our progress regarding this. If you want to contribute to this, please we will happily accept pull requests!