Generic WebAPI controller to provide a REST interface for MongoDB collections

MongoApiController.cs

using System.Collections.Generic;
using System.Linq;
using System.Web.Http;
using MongoDB.Bson;
using MongoDB.Driver;
using MongoDB.Driver.Builders;

namespace Web.Core
{
    public abstract class MongoApiController<T> : ApiController
    {
        private readonly MongoDatabase _db;
        private readonly string _collectionName;

        protected MongoApiController(MongoDatabase db, string collectionName)
        {
            _db = db;
            _collectionName = collectionName;
        }

        public virtual IEnumerable<T> Get(int? skip = null, int? take = null, string fields = null)
        {
            var cursor = _db.GetCollection<T>(_collectionName)
                .FindAll();

            if (skip != null) cursor = cursor.SetSkip(skip.Value);
            if (take != null) cursor = cursor.SetLimit(take.Value);
            if (fields != null) cursor = cursor.SetFields(fields.Split(','));

            return cursor
                .ToArray();
        }

        public virtual T Get(string id)
        {
            return _db.GetCollection<T>(_collectionName).FindOneById(BsonValue.Create(id));
        }

        public virtual void Post(T document)
        {
            _db.GetCollection<T>(_collectionName).Save(document);
        }

        public virtual IHttpActionResult Put(T document)
        {
            _db.GetCollection<T>(_collectionName).Insert(document);
            return Ok(document);
        }

        public virtual void Delete(string id)
        {
            _db.GetCollection<T>(_collectionName).Remove(Query.EQ("_id", BsonValue.Create(id)));
        }
    }
}