gem 'rom-mongodb'

# Define your container with mongo adapter

require 'mongo'
require 'rom'
require 'rom/mongo'

connection = Mongo::Client.new('mongodb://127.0.0.1:27017/your_db_name')
container = ROM.container(:mongo, connection) do |config|
  config.relation(:users) do
    schema(:users) do
      attribute :_id, ROM::Types.Nominal(BSON::ObjectId)
      attribute :email, ROM::Types::String
      attribute :rating, ROM::Types::Integer
      attribute :status, ROM::Types::Bool
      attribute :orders?, ROM::Types::Array # optional attribute, if field does not exists will return nil
    end
  end
end

# Define your repository

require 'rom/repository'

UserRepository = ::Class.new(ROM::Repository[:users]) do
  commands(:create, :delete, update: :by_pk)

  def all
    users.to_a
  end

  def find(**options)
    users.find(options)
  end
end

user_repository = UserRepository.new(container)

# Now you can do some manipulations with your repository

user_repository.create({ email: '[email protected]', rating: 42, status: true })
user_repository.all
user_repository.find(email: '[email protected]')