/// <summary>
/// Returns a collection cursor.
/// </summary>
/// <typeparam name="TDocument">The type representing a Document.</typeparam>
/// <param name="filter">A LINQ expression filter.</param>
/// <param name="partitionKey">An optional partition key.</param>
public IFindFluent <TDocument, TDocument> GetCursor <TDocument>(Expression <Func <TDocument, bool> > filter, string partitionKey = null) where TDocument : IDocument <TKey>
{
return(MongoDbReader.GetCursor <TDocument, TKey>(filter, partitionKey));
}
