Node.js MongoDB Driver API

Class: GridFSBucket

GridFSBucket

new GridFSBucket(db, options)

lib/gridfs-stream/index.js, line 32

Constructor for a streaming GridFS interface

Name Type Description
db Db

A db handle
options object optional

Optional settings.

Name Type Default Description
bucketName string "fs" optional

The 'files' and 'chunks' collections will be prefixed with the bucket name followed by a dot.
chunkSizeBytes number 255 * 1024 optional

Number of bytes stored in each chunk. Defaults to 255KB
writeConcern object optional

Optional write concern to be passed to write operations, for instance { w: 1 }
readPreference object optional

Optional read preference to be passed to read operations
Fires:
  • GridFSBucketWriteStream#event:index

Extends

  • external:EventEmitter

Methods

delete(id, callback)

lib/gridfs-stream/index.js, line 179

Deletes a file with the given id

Name Type Description
id ObjectId

The id of the file doc
callback GridFSBucket~errorCallback optional

drop(callback)

lib/gridfs-stream/index.js, line 334

Removes this bucket's files collection, followed by its chunks collection.

Name Type Description
callback GridFSBucket~errorCallback optional

find(filter, options){Cursor}

lib/gridfs-stream/index.js, line 225

Convenience wrapper around find on the files collection

Name Type Description
filter Object
options Object optional

Optional settings for cursor

Name Type Default Description
batchSize number 1000 optional

The number of documents to return per batch. See find command documentation.
limit number optional

Optional limit for cursor
maxTimeMS number optional

Optional maxTimeMS for cursor
noCursorTimeout boolean optional

Optionally set cursor's noCursorTimeout flag
skip number optional

Optional skip for cursor
sort object optional

Optional sort for cursor

openDownloadStream(id, options){GridFSBucketReadStream}

lib/gridfs-stream/index.js, line 156

Returns a readable stream (GridFSBucketReadStream) for streaming file
data from GridFS.

Name Type Description
id ObjectId

The id of the file doc
options Object optional

Optional settings.

Name Type Description
start Number optional

Optional 0-based offset in bytes to start streaming from
end Number optional

Optional 0-based offset in bytes to stop streaming before

openDownloadStreamByName(filename, options){GridFSBucketReadStream}

lib/gridfs-stream/index.js, line 268

Returns a readable stream (GridFSBucketReadStream) for streaming the
file with the given name from GridFS. If there are multiple files with
the same name, this will stream the most recent file with the given name
(as determined by the uploadDate field). You can set the revision
option to change this behavior.

Name Type Description
filename String

The name of the file to stream
options Object optional

Optional settings

Name Type Default Description
revision number -1 optional

The revision number relative to the oldest file with the given filename. 0 gets you the oldest file, 1 gets you the 2nd oldest, -1 gets you the newest.
start Number optional

Optional 0-based offset in bytes to start streaming from
end Number optional

Optional 0-based offset in bytes to stop streaming before

openUploadStream(filename, options){GridFSBucketWriteStream}

lib/gridfs-stream/index.js, line 87

Returns a writable stream (GridFSBucketWriteStream) for writing
buffers to GridFS. The stream's 'id' property contains the resulting
file's id.

Name Type Description
filename string

The value of the 'filename' key in the files doc
options object optional

Optional settings.

Name Type Default Description
chunkSizeBytes number optional

Optional overwrite this bucket's chunkSizeBytes for this file
metadata object optional

Optional object to store in the file document's metadata field
contentType string optional

Optional string to store in the file document's contentType field
aliases array optional

Optional array of strings to store in the file document's aliases field
disableMD5 boolean false optional

Deprecated If true, disables adding an md5 field to file data

openUploadStreamWithId(id, filename, options){GridFSBucketWriteStream}

lib/gridfs-stream/index.js, line 122

Returns a writable stream (GridFSBucketWriteStream) for writing
buffers to GridFS for a custom file id. The stream's 'id' property contains the resulting
file's id.

Name Type Description
id string | number | object

A custom id used to identify the file
filename string

The value of the 'filename' key in the files doc
options object optional

Optional settings.

Name Type Default Description
chunkSizeBytes number optional

Optional overwrite this bucket's chunkSizeBytes for this file
metadata object optional

Optional object to store in the file document's metadata field
contentType string optional

Optional string to store in the file document's contentType field
aliases array optional

Optional array of strings to store in the file document's aliases field
disableMD5 boolean false optional

Deprecated If true, disables adding an md5 field to file data

rename(id, filename, callback)

lib/gridfs-stream/index.js, line 304

Renames the file with the given _id to the given string

Name Type Description
id ObjectId

the id of the file to rename
filename String

new name for the file
callback GridFSBucket~errorCallback optional

Type Definitions

errorCallback(error, result)

lib/gridfs-stream/index.js, line 369

Callback format for all GridFSBucket methods that can accept a callback.

Name Type Description
error MongoError | undefined

If present, an error instance representing any errors that occurred
result *

If present, a returned result for the method

Events

index

lib/gridfs-stream/index.js, line 61

When the first call to openUploadStream is made, the upload stream will
check to see if it needs to create the proper indexes on the chunks and
files collections. This event is fired either when 1) it determines that
no index creation is necessary, 2) when it successfully creates the
necessary indexes.

Type:
  • Error