Class: GridStore

Members

staticGridStore.DEFAULT_CONTENT_TYPE

Default file mime type

staticGridStore.DEFAULT_ROOT_COLLECTION

The collection to be used for holding the files and chunks collection.

staticGridStore.IO_SEEK_CUR

Seek mode where the given length is an offset to the current read/write head.

staticGridStore.IO_SEEK_END

Seek mode where the given length is an offset to the end of the file.

staticGridStore.IO_SEEK_SET

Seek mode where the given length is absolute.

Methods

staticGridStore.exist(db, name, rootCollection, options, callback){Promise}

lib/gridfs/grid_store.js, line 1281

Checks if a file exists in the database.

Name	Type	Description
db	Db	the database to query.
name	string	The name of the file to look for.
rootCollection	string	optional The root collection that holds the files and chunks collection. Defaults to {GridStore.DEFAULT_ROOT_COLLECTION}.
options	object	optional Optional settings. Name Type Description readPreference ReadPreference | string optional The preferred read preference (ReadPreference.PRIMARY, ReadPreference.PRIMARY_PREFERRED, ReadPreference.SECONDARY, ReadPreference.SECONDARY_PREFERRED, ReadPreference.NEAREST). promiseLibrary object optional A Promise library class the application wishes to use such as Bluebird, must be ES6 compatible session ClientSession optional optional session to use for this operation
callback	GridStore~resultCallback	optional result from exists.

Deprecated

• Use GridFSBucket API instead

Returns:

Promise if no callback passed

staticGridStore.list(db, rootCollection, options, callback){Promise}

lib/gridfs/grid_store.js, line 1344

Gets the list of files stored in the GridFS.

Name	Type	Description
db	Db	the database to query.
rootCollection	string	optional The root collection that holds the files and chunks collection. Defaults to {GridStore.DEFAULT_ROOT_COLLECTION}.
options	object	optional Optional settings. Name Type Description readPreference ReadPreference | string optional The preferred read preference (ReadPreference.PRIMARY, ReadPreference.PRIMARY_PREFERRED, ReadPreference.SECONDARY, ReadPreference.SECONDARY_PREFERRED, ReadPreference.NEAREST). promiseLibrary object optional A Promise library class the application wishes to use such as Bluebird, must be ES6 compatible session ClientSession optional optional session to use for this operation
callback	GridStore~resultCallback	optional result from exists.

Deprecated

• Use GridFSBucket API instead

Returns:

Promise if no callback passed

staticGridStore.read(db, name, length, offset, options, callback){Promise}

lib/gridfs/grid_store.js, line 1412

Reads the contents of a file.

This method has the following signatures

(db, name, callback)
(db, name, length, callback)
(db, name, length, offset, callback)
(db, name, length, offset, options, callback)

Name	Type	Description
db	Db	the database to query.
name	string	The name of the file.
length	number	optional The size of data to read.
offset	number	optional The offset from the head of the file of which to start reading from.
options	object	optional Optional settings. Name Type Description readPreference ReadPreference | string optional The preferred read preference (ReadPreference.PRIMARY, ReadPreference.PRIMARY_PREFERRED, ReadPreference.SECONDARY, ReadPreference.SECONDARY_PREFERRED, ReadPreference.NEAREST). promiseLibrary object optional A Promise library class the application wishes to use such as Bluebird, must be ES6 compatible session ClientSession optional optional session to use for this operation
callback	GridStore~readCallback	optional the command callback.

Deprecated

• Use GridFSBucket API instead

Returns:

Promise if no callback passed

staticGridStore.readlines(db, name, separator, options, callback){Promise}

lib/gridfs/grid_store.js, line 1466

Read the entire file as a list of strings splitting by the provided separator.

Name	Type	Description
db	Db	the database to query.
name	String | object	the name of the file.
separator	string	optional The character to be recognized as the newline separator.
options	object	optional Optional settings. Name Type Description readPreference ReadPreference | string optional The preferred read preference (ReadPreference.PRIMARY, ReadPreference.PRIMARY_PREFERRED, ReadPreference.SECONDARY, ReadPreference.SECONDARY_PREFERRED, ReadPreference.NEAREST). promiseLibrary object optional A Promise library class the application wishes to use such as Bluebird, must be ES6 compatible session ClientSession optional optional session to use for this operation
callback	GridStore~readlinesCallback	optional the command callback.

Deprecated

• Use GridFSBucket API instead

Returns:

Promise if no callback passed

staticGridStore.unlink(db, names, options, callback){Promise}

lib/gridfs/grid_store.js, line 1503

Deletes the chunks and metadata information of a file from GridFS.

Name	Type	Description
db	Db	The database to query.
names	string | array	The name/names of the files to delete.
options	object	optional Optional settings. Name Type Description promiseLibrary object optional A Promise library class the application wishes to use such as Bluebird, must be ES6 compatible session ClientSession optional optional session to use for this operation
callback	GridStore~resultCallback	optional the command callback.

Deprecated

• Use GridFSBucket API instead

Returns:

Promise if no callback passed

chunkCollection(callback){Collection}

lib/gridfs/grid_store.js, line 560

Retrieve this file's chunks collection.

Name	Type	Description
callback	GridStore~collectionCallback	the command callback.

Deprecated

• Use GridFSBucket API instead

close(options, callback){Promise}

lib/gridfs/grid_store.js, line 472

Saves this file to the database. This will overwrite the old entry if it
already exists. This will work properly only if mode was initialized to
"w" or "w+".

Name	Type	Description
options	object	optional Optional settings Name Type Description session ClientSession optional optional session to use for this operation
callback	GridStore~resultCallback	optional this will be called after executing this method. The first parameter will contain null and the second one will contain a reference to this object.

Deprecated

• Use GridFSBucket API instead

Returns:

Promise if no callback passed

collection(callback){Collection}

lib/gridfs/grid_store.js, line 612

Retrieves the file collection associated with this object.

Name	Type	Description
callback	GridStore~collectionCallback	the command callback.

Deprecated

• Use GridFSBucket API instead

destroy()

lib/gridfs/grid_store.js, line 365

Handles the destroy part of a stream

Deprecated

• Use GridFSBucket API instead

eof(){boolean}

lib/gridfs/grid_store.js, line 253

Verify if the file is at EOF.

Deprecated

• Use GridFSBucket API instead

Returns:

if the read/write head is at the end of this file.

getc(callback){Promise}

lib/gridfs/grid_store.js, line 274

Retrieves a single character from this file.

Name	Type	Description
callback	GridStore~resultCallback	optional this gets called after this method is executed. Passes null to the first parameter and the character read to the second or null to the second if the read/write head is at the end of the file.

Deprecated

• Use GridFSBucket API instead

Returns:

Promise if no callback passed

open(options, callback){Promise}

lib/gridfs/grid_store.js, line 198

Opens the file from the database and initialize this object. Also creates a
new one if file does not exist.

Name	Type	Description
options	object	optional Optional settings Name Type Description session ClientSession optional optional session to use for this operation
callback	GridStore~openCallback	optional this will be called after executing this method

Deprecated

• Use GridFSBucket API instead

Returns:

Promise if no callback passed

puts(string, options, callback){Promise}

lib/gridfs/grid_store.js, line 310

Writes a string to the file with a newline character appended at the end if
the given string does not have one.

Name	Type	Description
string	string	the string to write.
options	object	optional Optional settings Name Type Description session ClientSession optional optional session to use for this operation
callback	GridStore~resultCallback	optional this will be called after executing this method. The first parameter will contain null and the second one will contain a reference to this object.

Deprecated

• Use GridFSBucket API instead

Returns:

Promise if no callback passed

read(length, buffer, options, callback){Promise}

lib/gridfs/grid_store.js, line 731

Retrieves the contents of this file and advances the read/write head. Works with Buffers only.

There are 3 signatures for this method:

(callback)
(length, callback)
(length, buffer, callback)

Name	Type	Description
length	number	optional the number of characters to read. Reads all the characters from the read/write head to the EOF if not specified.
buffer	string | Buffer	optional a string to hold temporary data. This is used for storing the string data read so far when recursively calling this method.
options	object	optional Optional settings Name Type Description session ClientSession optional optional session to use for this operation
callback	GridStore~readCallback	optional the command callback.

Deprecated

• Use GridFSBucket API instead

Returns:

Promise if no callback passed

readlines(separator, options, callback){Promise}

lib/gridfs/grid_store.js, line 635

Read the entire file as a list of strings splitting by the provided separator.

Name	Type	Description
separator	string	optional The character to be recognized as the newline separator.
options	object	optional Optional settings Name Type Description session ClientSession optional optional session to use for this operation
callback	GridStore~readlinesCallback	optional the command callback.

Deprecated

• Use GridFSBucket API instead

Returns:

Promise if no callback passed

rewind(options, callback){Promise}

lib/gridfs/grid_store.js, line 672

Deletes all the chunks of this file in the database if mode was set to "w" or
"w+" and resets the read/write head to the initial position.

Name	Type	Description
options	object	optional Optional settings Name Type Description session ClientSession optional optional session to use for this operation
callback	GridStore~resultCallback	optional this will be called after executing this method. The first parameter will contain null and the second one will contain a reference to this object.

Deprecated

• Use GridFSBucket API instead

Returns:

Promise if no callback passed

seek(position, seekLocation, options, callback){Promise}

lib/gridfs/grid_store.js, line 848

Moves the read/write head to a new location.

There are 3 signatures for this method

Seek Location Modes

• GridStore.IO_SEEK_SET, (default) set the position from the start of the file.
• GridStore.IO_SEEK_CUR, set the position from the current position in the file.
• GridStore.IO_SEEK_END, set the position from the end of the file.

Name	Type	Description
position	number	optional the position to seek to
seekLocation	number	optional seek mode. Use one of the Seek Location modes.
options	object	optional Optional settings Name Type Description session ClientSession optional optional session to use for this operation
callback	GridStore~gridStoreCallback	optional the command callback.

Deprecated

• Use GridFSBucket API instead

Returns:

Promise if no callback passed

stream(){GridStoreStream}

lib/gridfs/grid_store.js, line 330

Return a modified Readable stream including a possible transform method.

Deprecated

• Use GridFSBucket API instead

tell(length, buffer, options, callback){Promise}

lib/gridfs/grid_store.js, line 812

Retrieves the position of the read/write head of this file.

Name	Type	Description
length	number	optional the number of characters to read. Reads all the characters from the read/write head to the EOF if not specified.
buffer	string | Buffer	optional a string to hold temporary data. This is used for storing the string data read so far when recursively calling this method.
options	object	optional Optional settings Name Type Description session ClientSession optional optional session to use for this operation
callback	GridStore~tellCallback	optional the command callback.

Deprecated

• Use GridFSBucket API instead

Returns:

Promise if no callback passed

unlink(options, callback){Promise}

lib/gridfs/grid_store.js, line 575

Deletes all the chunks of this file in the database.

Name	Type	Description
options	object	optional Optional settings Name Type Description session ClientSession optional optional session to use for this operation
callback	GridStore~resultCallback	optional the command callback.

Deprecated

• Use GridFSBucket API instead

Returns:

Promise if no callback passed

write(data, close, options, callback){Promise}

lib/gridfs/grid_store.js, line 346

Writes some data. This method will work properly only if initialized with mode "w" or "w+".

Name	Type	Description
data	string | Buffer	the data to write.
close	boolean	optional closes this file after writing if set to true.
options	object	optional Optional settings Name Type Description session ClientSession optional optional session to use for this operation
callback	GridStore~resultCallback	optional this will be called after executing this method. The first parameter will contain null and the second one will contain a reference to this object.

Deprecated

• Use GridFSBucket API instead

Returns:

Promise if no callback passed

writeFile(file, options, callback){Promise}

lib/gridfs/grid_store.js, line 387

Stores a file from the file system to the GridFS database.

Name	Type	Description
file	string | Buffer | FileHandle	the file to store.
options	object	optional Optional settings Name Type Description session ClientSession optional optional session to use for this operation
callback	GridStore~resultCallback	optional this will be called after executing this method. The first parameter will contain null and the second one will contain a reference to this object.

Deprecated

• Use GridFSBucket API instead

Returns:

Promise if no callback passed

Type Definitions

collectionCallback(error, collection)

lib/gridfs/grid_store.js, line 545

The collection callback format.

Name	Type	Description
error	MongoError	An error instance representing the error during the execution.
collection	Collection	The collection from the command execution.

gridStoreCallback(error, gridStore)

lib/gridfs/grid_store.js, line 822

The tell callback format.

Name	Type	Description
error	MongoError	An error instance representing the error during the execution.
gridStore	GridStore	The gridStore.

openCallback(error, gridStore)

lib/gridfs/grid_store.js, line 180

The callback format for the Gridstore.open method

Name	Type	Description
error	MongoError	An error instance representing the error during the execution.
gridStore	GridStore	The GridStore instance if the open method was successful.

readCallback(error, data)

lib/gridfs/grid_store.js, line 706

The read callback format.

Name	Type	Description
error	MongoError	An error instance representing the error during the execution.
data	Buffer	The data read from the GridStore object

readlinesCallback(error, strings)

lib/gridfs/grid_store.js, line 617

The readlines callback format.

Name	Type	Description
error	MongoError	An error instance representing the error during the execution.
strings	Array.<string>	The array of strings returned.

resultCallback(options, error, result)

lib/gridfs/grid_store.js, line 257

The callback result format.

Name	Type	Description
options	object	optional Optional settings Name Type Description session ClientSession optional optional session to use for this operation
error	MongoError	An error instance representing the error during the execution.
result	object	The result from the callback.

tellCallback(error, position)

lib/gridfs/grid_store.js, line 793

The tell callback format.

Name	Type	Description
error	MongoError	An error instance representing the error during the execution.
position	number	The current read position in the GridStore.