Support GridFS [moved]

This is Issue 153 moved from a Google Code project. Added by 2010-11-02T17:41:54.000Z by scotthernandez. Please review that bug for more context and additional comments, but update this bug.

Original labels: Type-Enhancement, Priority-Low, Milestone-Release1.0

Original description

There are two ways I can see supporting gridfs.
1.) Add a special type/annotation that can be used as a reference to a gridfs file (by path or _id)

class HasAFileRef {
@Id ObjectId id;
@GridFS OutputStream/GridFSDBFile/byte[] gridFsFile;
...
}

2.) Wrap a class as the gridfsfile.metadata fields.

@GridFsFile
class IsAFile {
@Id ObjectId id;
String field1; // maps to metadata.field1
...
[GridFSFile gfsFile;]
}

[schmitzhermes]

are there any updates on this?

[heruan]

Thanks! I misinterpreted your last message as if Morphia had already some support to map files to entities. This is the use case I have right now:

class Attachment {
    String id;
    String name;
    Blob data;
}

This is a JPA-mapped entity which uses the Blob type to read from database, i.e. data.getBinaryStream() which reads from the database (without loading all the bytes in memory).

I’m moving from JPA to Morphia and I don’t really know how to migrate this last bit of logic!

It would then be used like:

InputStream downloadAttachment(String id) {
    return repository.find(id).getData().getBinaryStream();
}