sample ruby script to batch write onto DynamoDB

batcth_write_dynamodb.rb

require 'aws'
require 'aws-sdk'

ACCESS_KEY_ID='access key'
SECRET_ACCESS_KEY='secret access key'
TABLE='table name'
MAX_ITEMS=100

AWS.config({
  access_key_id: ACCESS_KEY_ID,
  secret_access_key: SECRET_ACCESS_KEY,
  dynamo_db_endpoint: 'dynamodb.ap-northeast-1.amazonaws.com'
})

batch = AWS::DynamoDB::BatchWrite.new

items = []
MAX_ITEMS.times do |item_id|
  items.push({
    item_id: item_id.to_s,
    selling_date: (Time.now - 60* 60 * 24 * Random.rand(100)).strftime('%Y/%m/%d'),
    total_amount: Random.rand(10000)
  })
  if items.size == 25
    batch.put(TABLE, items.dup)
    batch.process!
    items.clear
  end
end

batch.process!