albatross

Albatross is a small library that makes accessing MongoDB from Node.js a breeze. It's goal is to be a thin wrapper that enables you to forget about connection state and get right to accessing your data.

Installation

npm install --save albatross

Usage

const albatross = require('albatross')

const db = albatross('mongodb://localhost/test')
const user = db.collection('user')

await user.insert({ name: 'Linus', born: 1992 })
await user.insert({ name: 'Steve', born: 1955 })

const doc = await user.findOne({ born: 1992 })
console.log('Hello ' + doc.name)
//=> Hello Linus

const fs = require('fs')
const grid = db.grid()

const input = fs.createReadStream('readme.md')
const opts = { filename: 'readme.md', contentType: 'text/plain' }

const id = await grid.upload(input, opts)
const result = await grid.download(id)

result.filename // 'readme.md'
result.contentType // 'text/plain'

result.stream.pipe(process.stdout)

You can start querying the database right away, as soon as a connection is established it will start sending your commands to the server.

API

Module

The module exposes a single function to create a new Albatross instance. It also exposes the BSON Binary API on this function.

albatross(uri)

Creates a new instance of Albatross and connect to the specified uri.

Note: Albatross creates the MongoDB client with ignoreUndefined: true, which means that undefined values will not be stored in the database. This is the new default in the BSON library, and is also how the standard JSON.stringify works.

BSON Binary API

The following functions are exposed on the module:

Binary
Code
DBRef
Decimal128
Double
Int32
Long
MaxKey
MinKey
ObjectId
Timestamp

Albatross

.collection(name)

Returns a new instance of Collection bound to the collection named name.

.grid([name])

Returns a new instance of Grid, optionally using the supplied name as the name of the root collection.

.id(strOrObjectId)

Makes sure that the given argument is an ObjectId.

.ping([timeout]): Promise<void>

Send the ping command to the server, to check that the connection is still intact.

Optionally accepts a timeout in milliseconds.

.transaction(fn): Promise

Runs a provided function within a transaction, retrying either the commit operation or entire transaction as needed (and when the error permits) to better ensure that the transaction can complete successfully.

Example:

const user = db.collection('user')

const result = await db.transaction(async (session) => {
    await user.insert({ name: 'Linus', born: 1992 }, { session })
    await user.insert({ name: 'Steve', born: 1955 }, { session })

    return await user.findOne({ born: 1992 }, { session })
})

console.log('Hello ' + result.name)
//=> Hello Linus

.close(): Promise<void>

Closes the connection to the server.

Collection

.id(strOrObjectId)

Makes sure that the given argument is an ObjectId.

findOne(query[, opts]): Promise<object>

Find the first document that matches query.

find(query[, opts]): Promise<object[]>

Find all records that matches query.

count(query[, opts]): Promise<number>

Count number of documents matching the query.

distinct(key[, query[, opts]]): Promise<any[]>

Finds a list of distinct values for the given key.

note: if you specify opts you also need to specify query

exists(query): Promise<boolean>

Check if at least one document is matching the query.

insert(docs[, opts]): Promise<object | object[]>

Inserts a single document or a an array of documents.

The Promise will resolve with the documents that was inserted. When called with an object instead of an array as the first argument, the Promise resolves with an object instead of an array as well.

Note: Contrary to the standard MongoDB Node.js driver, this function will not modify any objects that are passed in. Instead, the returned documents from this function are what was saved in the database.

findOneAndUpdate(filter, update[, opts]): Promise<object>

Finds a document and updates it in one atomic operation.

By default, the document before the update is returned. To return the document after the update, pass returnOriginal: false in the options.

updateOne(filter, update[, opts]): Promise<UpdateResult>

Updates a single document matching filter. Resolves with an object with the following properties:

• matched: Number of documents that matched the query
• modified: Number of documents that was modified

updateMany(filter, update[, opts]): Promise<UpdateResult>

Updates multiple documents matching filter. Resolves with an object with the following properties:

• matched: Number of documents that matched the query
• modified: Number of documents that was modified

deleteOne(filter[, opts]): Promise<number>

Deletes a single document matching filter. Resolves with the number of documents deleted.

deleteMany(filter[, opts]): Promise<number>

Deletes multiple documents matching filter. Resolves with the number of documents deleted.

aggregate(pipeline[, opts]): Promise<object[]>

Executes an aggregation framework pipeline against the collection. Resolves with the aggregated objects.

Grid

id(strOrObjectId)

Makes sure that the given argument is an ObjectId.

upload(stream[, opts]): Promise<FileInfo>

Store the stream as a file in the grid store, opts is a object with the following properties. All options are optionally.

• filename: The value of the filename key in the files doc
• chunkSizeBytes: Overwrite this bucket's chunkSizeBytes for this file
• metadata: Object to store in the file document's metadata field
• contentType: String to store in the file document's contentType field
• aliases: Array of strings to store in the file document's aliases field

The FileInfo object has the following properties:

• id: The id of the file
• md5: The md5 hash of the file
• length: The length of the file
• chunkSize: The size of each chunk in bytes
• filename: The value of the filename key in the files doc
• metadata: An object with the metadata associated with the file
• contentType: The value of the contentType key in the files doc

download(id): Promise<FileInfo>

Get the file with the specified id from the grid store. The Promise will resolve with an object with the following properties. If no file with the indicated id was found, the Promise will resolve to null.

• id: The id of the file
• md5: The md5 hash of the file
• length: The length of the file
• chunkSize: The size of each chunk in bytes
• filename: The value of the filename key in the files doc
• metadata: An object with the metadata associated with the file
• contentType: The value of the contentType key in the files doc
• stream: The stream with the data that was inside the file

delete(id): Promise<void>

Delete the file with the specified id from the grid store.

In depth documentation

For more in depth documentation please see the mongodb module which Albatross wraps, especially the Collection object.

Contributing

Pull requests are always welcome, please make sure to add tests and run mocha before submitting.

The tests requiers a MongoDB server running at localhost.

License

Albatross is licensed under the MIT license.