/// <summary>
/// Gets a collections for the type TDocument with a partition key.
/// </summary>
/// <typeparam name="TDocument">The document type.</typeparam>
/// <typeparam name="TKey">The type of the primary key.</typeparam>
/// <param name="partitionKey">The collection partition key.</param>
/// <returns></returns>
public virtual IMongoCollection <TDocument> GetCollection <TDocument, TKey>(string partitionKey = null)
where TDocument : IDocument <TKey>
where TKey : IEquatable <TKey>
{
return(MongoDbReader.GetCollection <TDocument, TKey>(partitionKey));
}