IMongoRepository.cs

public interface IDocumentRepository<T> where T : IAggregate {
    // we expose IMongoQueryable directly because it has Mongo-specific methods
    IMongoQueryable<T> Query();
    Task<T> Get(Guid id);
    Task Save(T document);
    Task Update(T document, Expression<Func<T, bool>> filter);
    Task Update(T document);
    IMongoCollection<T> Collection { get; }
}