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Indexes: Indexing Attachments

To address the need of indexing (and searching for) the attachments we have introduced the AttachmentsFor method that can be used in indexing functions. This method will return a list of attachments in given document with basic information like Name or Size about every one of them.

Creating Indexes

The AttachmentsFor method returns all of the attachments for a document passed as the first argument.

List<AttachmentName> AttachmentsFor(Object doc);
private String name;
private String hash;
private String contentType;
private long size;

public String getName() {
    return name;

public void setName(String name) { = name;

public String getHash() {
    return hash;

public void setHash(String hash) {
    this.hash = hash;

public String getContentType() {
    return contentType;

public void setContentType(String contentType) {
    this.contentType = contentType;

public long getSize() {
    return size;

public void setSize(long size) {
    this.size = size;

public static class Employees_ByAttachmentNames extends AbstractIndexCreationTask {
    public static class Result {
        private String[] attachmentNames;

        public String[] getAttachmentNames() {
            return attachmentNames;

        public void setAttachmentNames(String[] attachmentNames) {
            this.attachmentNames = attachmentNames;

    public Employees_ByAttachmentNames() {
        map = "from e in docs.Employees\n" +
            "let attachments = AttachmentsFor(e)\n" +
            "select new\n" +
            "{\n" +
            "   attachmentNames = attachments.Select(x => x.Name).ToArray()\n" +


//return all employees that have CV attached
session.query(Employees_ByAttachmentNames.Result.class, Employees_ByAttachmentNames.class)
    .containsAny("attachmentNames", Lists.newArrayList("cv.pdf"))