MongoDB M101 HW 3.1 in Ruby

gistfile1.rb

require 'mongo'
require 'json'

include Mongo

@client = MongoClient.new('localhost', 27017)
@db = @client['school']
@students = @db['students']

@students.find().each { |student|
  @filter = [];

  puts student['_id']

  student['scores'].each { |score|
    if score['type'] == 'homework'
      @filter << score['score']
    end
  }

  @students.update(
    {
      '_id' => student['_id'],
    },
    {
      '$pull' => {'scores' => { 'type' => 'homework', 'score' => @filter.sort[0] } }
    }
  )
}