README.md

MongoSwift

The official MongoDB driver for Swift.

Index

• Documentation
• Bugs/Feature Requests
• Installation
  • macOS and Linux
    • Step 1: Install the MongoDB C Driver
    • Step 2: Install MongoSwift
  • iOS, tvOS, and watchOS
• Example Usage
  • Connect to MongoDB and Create a Collection
  • Create and Insert a Document
  • Find Documents
  • Work With and Modify Documents
  • Usage With Kitura and Vapor
• Development Instructions

Documentation

The latest documentation 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.

Installation

MongoSwift works with Swift 4.0+.

macOS and Linux

Installation on macOS and Linux is supported via Swift Package Manager.

Step 1: Install the MongoDB C Driver

The driver wraps the MongoDB C driver, and using it requires having the C driver's two components, libbson and libmongoc, installed on your system. The minimum required version of the C Driver is 1.13.0.

On a Mac, you can install both components at once using Homebrew: brew install mongo-c-driver.

On Linux: please follow the instructions from libmongoc's documentation. Note that the versions provided by your package manager may be too old, in which case you can follow the instructions for building and installing from source.

See example installation from source on Ubuntu in Docker.

Step 2: Install MongoSwift

Please follow the instructions in the previous section on installing the MongoDB C Driver before proceeding.

Add MongoSwift to your dependencies in Package.swift:

// swift-tools-version:4.0
import PackageDescription

let package = Package(
    name: "MyPackage",
    dependencies: [
        .package(url: "https://github.com/mongodb/mongo-swift-driver.git", from: "VERSION.STRING.HERE"),
    ],
    targets: [
        .target(name: "MyPackage", dependencies: ["MongoSwift"])
    ]
)

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

iOS, tvOS, and watchOS

Installation is supported via CocoaPods.

The pod includes as a dependency an embedded version of the MongoDB C Driver, meant for use on these OSes.

Note: the embedded driver currently does not support SSL. See #141 and CDRIVER-2850 for more information.

Add MongoSwift to your Podfile as follows:

platform :ios, '11.0'
use_frameworks!

target 'MyApp' do
    pod 'MongoSwift', '~> VERSION.STRING.HERE'
end

Then run pod install to install your project's dependencies.

Example Usage

Initialization

You must call MongoSwift.initialize() once at the start of your application to initialize libmongoc. This initializes global state, such as process counters. Subsequent calls will have no effect.

You should call MongoSwift.cleanup() exactly once at the end of your application to release all memory and other resources allocated by libmongoc. MongoSwift.initialize() will not reinitialize the driver after MongoSwift.cleanup().

Connect to MongoDB and Create a Collection

import MongoSwift

// initialize global state
MongoSwift.initialize()

let client = try MongoClient(connectionString: "mongodb://localhost:27017")
let db = try client.db("myDB")
let collection = try db.createCollection("myCollection")

// free all resources
MongoSwift.cleanup()

Note: we have included the client connectionString for clarity, but if connecting to the default "mongodb://localhost:27017"it may be omitted: let client = try MongoClient().

Create and Insert a Document

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

Find Documents

let query: Document = ["a": 1]
let documents = try collection.find(query)
for d in documents {
    print(d)
}

Work With and Modify Documents

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

print(doc) // prints `{"a" : 1, "b" : 2, "c" : 3}`
print(doc["a"] ?? "") // prints `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 as? Int else {
        return false
    }
    return value % 2 == 0
}
print(evensDoc) // prints `{ "b" : 2, "d" : 4 }`

let doubled = doc.map { elem -> Int in
    guard let value = elem.value as? Int else {
        return 0
    }

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

Note that Document 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 and Vapor

The Examples/ directory contains sample projects that use the driver with Kitura and Vapor.

Development Instructions

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