Por que usar o MongoDB com Ruby?

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require 'bundler/inline'
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gemfile do
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  source 'https://rubygems.org'
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  gem 'mongo'
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end
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client = Mongo::Client.new('mongodb+srv://username:password@mycluster.mongodb.net/test')
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collection = client[:foo]
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collection.insert_one({ bar: "baz" })
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puts collection.find.first 
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# => {"_id"=>BSON::ObjectId('62d83d9dceb023b20aff228a'), "bar"=>"baz"}

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# set a new field 'counter' to 1
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collection.update_one({ _id: BSON::ObjectId('62d83d9dceb023b20aff228a')}, :"$set" => { counter: 1 })
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puts collection.find.first 
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# => {"_id"=>BSON::ObjectId('62d83d9dceb023b20aff228a'), "bar"=>"baz", "counter"=>1}
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# increment the field 'counter' by one
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collection.update_one({ _id: BSON::ObjectId('62d83d9dceb023b20aff228a')}, :"$inc" => { counter: 1 })
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puts collection.find.first 
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# => {"_id"=>BSON::ObjectId('62d83d9dceb023b20aff228a'), "bar"=>"baz", "counter"=>2}
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# remove the test document
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collection.delete_one({ _id: BSON::ObjectId('62d83d9dceb023b20aff228a') })

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require 'bundler/inline'
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gemfile do
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  source 'https://rubygems.org'
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  gem 'mongoid'
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end
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Mongoid.configure do |config|
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  config.clients.default = { uri: "mongodb+srv://username:password@mycluster.mongodb.net/test" }
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end
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class Foo
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  include Mongoid::Document
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  field :bar, type: String
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  field :counter, type: Integer, default: 1
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end
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# create a new instance of 'Foo', which will assign a default value of 1 to the 'counter' field
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foo = Foo.create bar: "baz"
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puts foo.inspect 
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# => <Foo _id: 62d84be3ceb023b76a48df90, bar: "baz", counter: 1>
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# interact with the instance variable 'foo' and modify fields programmatically
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foo.counter += 1
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# save the instance of the model, persisting changes back to MongoDB
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foo.save!
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puts foo.inspect 
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# => <Foo _id: 62d84be3ceb023b76a48df90, bar: "baz", counter: 2>