MongoDB with the Ruby driver

Uses the mongo gem 2.26. The code is an ordinary application for the original database; nothing in it knows about MachNoSQL.

The only change

mongodb://app:secret@mongo.example.com:27017/shop?authSource=admin
mongodb://app:secret@machnosql.example.com:27017/shop?authSource=admin

The address comes from the environment variable MONGODB_URI, so switching to MachNoSQL changes configuration only.

Run

export MONGODB_URI='mongodb://app:secret@machnosql.example.com:27017/shop?authSource=admin'
bundle install
bundle exec ruby app.rb

Source

The program as it is kept and tested in the Mach Database NoSQL repository; highlighted lines read the connection setting.

# Orders example for MongoDB, unchanged on MachNoSQL.
require "mongo"

client = Mongo::Client.new(ENV.fetch("MONGODB_URI"))
orders = client[:orders]

orders.delete_many({})
orders.insert_many([
  { customer: "ada", item: "keyboard", qty: 1, price: 49.0 },
  { customer: "ada", item: "mouse", qty: 2, price: 19.5 },
  { customer: "linus", item: "monitor", qty: 1, price: 199.0 }
])

puts orders.find(item: "mouse").first
orders.update_one({ item: "mouse" }, { "$inc" => { qty: 1 } })

orders.aggregate([
  { "$group" => { _id: "$customer", revenue: { "$sum" => { "$multiply" => ["$qty", "$price"] } } } },
  { "$sort" => { revenue: -1 } }
]).each { |row| puts row }

client.close

source "https://rubygems.org"

gem "mongo", "~> 2.26"