MongoSwift

The official MongoDB driver for Swift applications on macOS and Linux.

Index

• Documentation
• Bugs/Feature Requests
• Installation
  • Step 1: Install Required System Libraries (Linux Only)
  • Step 2: Install MongoSwift
• Example Usage
  • Connect to MongoDB and Create a Collection
  • Create and Insert a Document
  • Find Documents
  • Work With and Modify Documents
  • Usage With Kitura, Vapor, and Perfect
• Development Instructions

Documentation

The latest documentation for the driver is available here. The latest documentation for the driver's BSON library is available here.

Bugs / Feature Requests

Think you've found a bug? Want to see a new feature in mongo-swift-driver? Please open a case in our issue management tool, JIRA:

1. Create an account and login: jira.mongodb.org
2. Navigate to the SWIFT project: jira.mongodb.org/browse/SWIFT
3. Click Create Issue - Please provide as much information as possible about the issue and how to reproduce it.

Bug reports in JIRA for all driver projects (i.e. NODE, PYTHON, CSHARP, JAVA) and the Core Server (i.e. SERVER) project are public.

Security Concerns

Please see SECURITY.md for details on our security process.

Installation

The driver supports use with Swift 5.1+. The minimum macOS version required to build the driver is 10.14. The driver is tested in continuous integration against macOS 11 and 12, and Ubuntu 18.04 and 20.04.

Installation is supported via Swift Package Manager.

You can find details about all our versions in this repo's releases page.

Step 1: Install Required System Libraries (Linux Only)

The driver vendors and wraps the MongoDB C driver (libmongoc), which depends on a number of external C libraries when built in Linux environments. As a result, these libraries must be installed on your system in order to build MongoSwift.

To install those libraries, please follow the instructions from libmongoc's documentation.

Step 2: Install the driver

The driver contains two modules to support a variety of use cases: an asynchronous API in MongoSwift, and a synchronous API in MongoSwiftSync. The modules share a number of core types such as options structs. The driver depends on our library swift-bson, containing a BSON implementation. All BSON symbols are re-exported from the drivers' modules, so you do not need to explicitly import BSON in your application.

To install the driver, add the package and relevant module as a dependency in your project's Package.swift file:

// swift-tools-version:5.1
import PackageDescription

let package = Package(
    name: "MyPackage",
    platforms: [
        .macOS(.v10_14) // minimum macOS version driver supports
    ],
    dependencies: [
        .package(url: "https://github.com/mongodb/mongo-swift-driver", .upToNextMajor(from: "1.3.1"))
    ],
    targets: [
        // Async module
        .target(name: "MyAsyncTarget", dependencies: ["MongoSwift"]),
        // Sync module
        .target(name: "MySyncTarget", dependencies: ["MongoSwiftSync"])
    ]
)

Then run swift build to download, compile, and link all your dependencies.

Example Usage

Note: You should call cleanupMongoSwift() exactly once at the end of your application to release all memory and other resources allocated by libmongoc.

Connect to MongoDB and Create a Collection

Async/Await (recommended):

import MongoSwift
import NIO

let elg = MultiThreadedEventLoopGroup(numberOfThreads: 4)
let client = try MongoClient("mongodb://localhost:27017", using: elg)

defer {
    // clean up driver resources
    try? client.syncClose()
    cleanupMongoSwift()

    // shut down EventLoopGroup
    try? elg.syncShutdownGracefully()
}

let db = client.db("myDB")
let collection = try await db.createCollection("myCollection")
// use collection...

Async (EventLoopFutures):

import MongoSwift
import NIO

let elg = MultiThreadedEventLoopGroup(numberOfThreads: 4)
let client = try MongoClient("mongodb://localhost:27017", using: elg)

defer {
    // clean up driver resources
    try? client.syncClose()
    cleanupMongoSwift()

    // shut down EventLoopGroup
    try? elg.syncShutdownGracefully()
}

let db = client.db("myDB")

let result = db.createCollection("myCollection").flatMap { collection in
    // use collection...
}

Sync:

import MongoSwiftSync

defer {
    // free driver resources
    cleanupMongoSwift()
}

let client = try MongoClient("mongodb://localhost:27017")

let db = client.db("myDB")
let collection = try db.createCollection("myCollection")

// use collection...

Note: we have included the client connectionString parameter for clarity, but if connecting to the default "mongodb://localhost:27017"it may be omitted.

Create and Insert a Document

Async/Await (recommended):

let doc: BSONDocument = ["_id": 100, "a": 1, "b": 2, "c": 3]
let result = try await collection.insertOne(doc)
print(result?.insertedID ?? "") // prints `.int64(100)`

Async (EventLoopFutures):

let doc: BSONDocument = ["_id": 100, "a": 1, "b": 2, "c": 3]
collection.insertOne(doc).whenSuccess { result in
    print(result?.insertedID ?? "") // prints `.int64(100)`
}

Sync:

let doc: BSONDocument = ["_id": 100, "a": 1, "b": 2, "c": 3]
let result = try collection.insertOne(doc)
print(result?.insertedID ?? "") // prints `.int64(100)`

Find Documents

Async/Await (recommended):

let query: BSONDocument = ["a": 1]
// The `sort` option specifies the order in which results are returned
// via the cursor. In this case, `["_id": -1]` indicates that the documents will
// be returned in descending order according to the `_id` field.
let options = FindOptions(sort: ["_id": -1])
for try await doc in try await collection.find(query, options: options) {
    print(doc)
}

Async (EventLoopFutures):

let query: BSONDocument = ["a": 1]
// The `sort` option specifies the order in which results are returned
// via the cursor. In this case, `["_id": -1]` indicates that the documents will
// be returned in descending order according to the `_id` field.
let options = FindOptions(sort: ["_id": -1])
let result = collection.find(query, options: options).flatMap { cursor in
    cursor.forEach { doc in
        print(doc)
    }
}

Sync:

let query: BSONDocument = ["a": 1]
// The `sort` option specifies the order in which results are returned
// via the cursor. In this case, `["_id": -1]` indicates that the documents will
// be returned in descending order according to the `_id` field.
let options = FindOptions(sort: ["_id": -1])
let documents = try collection.find(query, options: options)
for d in documents {
    print(try d.get())
}

Work With and Modify Documents

var doc: BSONDocument = ["a": 1, "b": 2, "c": 3]

print(doc) // prints `{"a" : 1, "b" : 2, "c" : 3}`
print(doc["a"] ?? "") // prints `.int64(1)`

// Set a new value
doc["d"] = 4
print(doc) // prints `{"a" : 1, "b" : 2, "c" : 3, "d" : 4}`

// Using functional methods like map, filter:
let evensDoc = doc.filter { elem in
    guard let value = elem.value.asInt() else {
        return false
    }
    return value % 2 == 0
}
print(evensDoc) // prints `{ "b" : 2, "d" : 4 }`

let doubled = doc.map { elem -> Int in
    guard case let value = .int64(value) else {
        return 0
    }

    return Int(value * 2)
}
print(doubled) // prints `[2, 4, 6, 8]`

Note that BSONDocument conforms to Collection, so useful methods from Sequence and Collection are all available. However, runtime guarantees are not yet met for many of these methods.

Usage With Kitura, Vapor, and Perfect

The Examples/ directory contains sample web application projects that use the driver with Kitura, Vapor, and Perfect. We also have an example full-stack Swift app with an iOS frontend and a backend built with Vapor.

Please note that the driver is built using SwiftNIO 2, and therefore is incompatible with frameworks built upon SwiftNIO 1. SwiftNIO 2 is used as of Vapor 4.0 and Kitura 2.5.

Development Instructions

See our development guide for instructions for building and testing the driver.