Why Use MongoDB with Ruby

1
require 'bundler/inline'
2
 
3
gemfile do
4
  source 'https://rubygems.org'
5
  gem 'mongo'
6
end
7
 
8
client = Mongo::Client.new('mongodb+srv://username:password@mycluster.mongodb.net/test')
9
collection = client[:foo]
10
collection.insert_one({ bar: "baz" })
11
 
12
puts collection.find.first 
13
# => {"_id"=>BSON::ObjectId('62d83d9dceb023b20aff228a'), "bar"=>"baz"}

1
# set a new field 'counter' to 1
2
collection.update_one({ _id: BSON::ObjectId('62d83d9dceb023b20aff228a')}, :"$set" => { counter: 1 })
3
 
4
puts collection.find.first 
5
# => {"_id"=>BSON::ObjectId('62d83d9dceb023b20aff228a'), "bar"=>"baz", "counter"=>1}
6
 
7
# increment the field 'counter' by one
8
collection.update_one({ _id: BSON::ObjectId('62d83d9dceb023b20aff228a')}, :"$inc" => { counter: 1 })
9
 
10
puts collection.find.first 
11
# => {"_id"=>BSON::ObjectId('62d83d9dceb023b20aff228a'), "bar"=>"baz", "counter"=>2}
12
 
13
# remove the test document
14
collection.delete_one({ _id: BSON::ObjectId('62d83d9dceb023b20aff228a') })

1
require 'bundler/inline'
2
 
3
gemfile do
4
  source 'https://rubygems.org'
5
 
6
  gem 'mongoid'
7
end
8
 
9
Mongoid.configure do |config|
10
  config.clients.default = { uri: "mongodb+srv://username:password@mycluster.mongodb.net/test" }
11
end
12
 
13
class Foo
14
  include Mongoid::Document
15
 
16
  field :bar, type: String
17
  field :counter, type: Integer, default: 1
18
end
19
 
20
# create a new instance of 'Foo', which will assign a default value of 1 to the 'counter' field
21
foo = Foo.create bar: "baz"
22
 
23
puts foo.inspect 
24
# => <Foo _id: 62d84be3ceb023b76a48df90, bar: "baz", counter: 1>
25
 
26
# interact with the instance variable 'foo' and modify fields programmatically
27
foo.counter += 1
28
 
29
# save the instance of the model, persisting changes back to MongoDB
30
foo.save!
31
 
32
puts foo.inspect 
33
# => <Foo _id: 62d84be3ceb023b76a48df90, bar: "baz", counter: 2>