[mongodb-user] C# GridFS, custom index on metadata

[Jens Christiansen]

Hi

How do I in C# create an index on custom field in the metadata of GridFS?

I'm currently adding a custom object as metadata and I really like to add
an index to one of the attributes in the object.

Regards,
Jens Christiansen
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['Wan Bachtiar' via mongodb-user]

How do I in C# create an index on custom field in the metadata of GridFS?

Hi Jens,

I’m assuming you’re referring to the files.metadata
<https://docs.mongodb.com/manual/core/gridfs/#files.metadata>.
GridFS <https://docs.mongodb.com/manual/core/gridfs/#gridfs> stores files
in two collections, chunks and files.
For the metadata fields in the files
<https://docs.mongodb.com/manual/core/gridfs/#gridfs-files-collection>, you
can just create an index as any other index.

For example, to add an index on a files metadata field called foo:

var collection = database.GetCollection<BsonDocument>("fs.files");
var keys = Builders<BsonDocument>.IndexKeys.Ascending("metadata.foo");

Regards,
Wan.
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