Indexes: Indexing Attachments

The AttachmentsFor method returns a list of attachments in a given document as well as basic information like Name or Size about each of them.

• AttachmentsFor
• AttachmentName

IEnumerable<AttachmentName> AttachmentsFor(object doc);

public string Name;

public string Hash;

public string ContentType;

public long Size;

Creating an index using AttachmentsFor()

The AttachmentsFor method is available in AbstractIndexCreationTask.

public class Employees_ByAttachmentNames : AbstractIndexCreationTask<Employee>
{
  public class Result
  {
      public string[] AttachmentNames { get; set; }
  }

  public Employees_ByAttachmentNames()
  {
      Map = employees => from e in employees
                         let attachments = AttachmentsFor(e)
                         select new Result
                         {
                             AttachmentNames = attachments.Select(x => x.Name).ToArray()
                         };
  }
}

Querying the index

• Sync
• Async
• DocumentQuery

//return all employees that have an attachment called "cv.pdf"
List<Employee> employees = session
  .Query<Employees_ByAttachmentNames.Result, Employees_ByAttachmentNames>()
  .Where(x => x.AttachmentNames.Contains("cv.pdf"))
  .OfType<Employee>()
  .ToList();

//return all employees that have an attachment called "cv.pdf"
List<Employee> employees = await asyncSession
  .Query<Employees_ByAttachmentNames.Result, Employees_ByAttachmentNames>()
  .Where(x => x.AttachmentNames.Contains("cv.pdf"))
  .OfType<Employee>()
  .ToListAsync();

//return all employees that have an attachment called "cv.pdf"
List<Employee> employees = session
  .Advanced
  .DocumentQuery<Employee, Employees_ByAttachmentNames>()
  .ContainsAny("AttachmentNames", new[] { "cv.pdf" })
  .ToList();