albatross
v4.0.0
Published
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.
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Readme
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
import albatross from 'albatross'
import fs from 'node:fs'
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 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 default exports a single function to create a new Albatross
instance. It also exports the BSON Binary API as named exports.
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 exported from the module:
Binary
Code
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 returnDocument: 'after'
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 querymodified
: 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 querymodified
: 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 thefilename
key in the files docchunkSizeBytes
: Overwrite this bucket'schunkSizeBytes
for this filemetadata
: Object to store in the file document'smetadata
fieldcontentType
: String to store in the file document'scontentType
fieldaliases
: Array of strings to store in the file document'saliases
field
The FileInfo
object has the following properties:
id
: The id of the filelength
: The length of the filechunkSize
: The size of each chunk in bytesfilename
: The value of thefilename
key in the files docmetadata
: An object with the metadata associated with the filecontentType
: The value of thecontentType
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 filelength
: The length of the filechunkSize
: The size of each chunk in bytesfilename
: The value of thefilename
key in the files docmetadata
: An object with the metadata associated with the filecontentType
: The value of thecontentType
key in the files docstream
: 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.