DynamoDBがローカルで実行できるらしいので開発用に試してみた。

ダウンロード・展開

wget http://dynamodb-local.s3-website-us-west-2.amazonaws.com/dynamodb_local_latest.zip #ダウンロード
unzip dynamodb_local_latest.zip #展開

起動

java -Djava.library.path=./DynamoDBLocal_lib -jar DynamoDBLocal.jar -sharedDb #デフォルトだとPort8000で起動

接続

# aws cliがインストールされていれば、endpointを指定するだけで使える
local$ aws dynamodb list-tables --endpoint-url http://localhost:8000
{
    "TableNames": [
        "test"
    ]
}

Railsから使う

runnerでやってみた。
※Rails 4.2.6

Gemfile

# SDKをGemで追加
gem 'aws-sdk'

lib/tasks/dynamo.rb

gem 'aws-sdk-core'

class Tasks::Dynamo
  def self.execute
    dynamo = Aws::DynamoDB::Client.new(
        endpoint: 'http://localhost:8000' #ローカルに対して
    )

    options = {
        table_name: "products",
        attribute_definitions: [
            {
                attribute_name: "product_code",
                attribute_type: "S"
            }
        ],
        key_schema: [
            {
                attribute_name: "product_code",
                key_type: "HASH"
            }
        ],
        provisioned_throughput: {
            read_capacity_units:  1,
            write_capacity_units:  1
        }
    }

    dynamo.create_table(options) #Table作成

    p dynamo.describe_table({table_name: "products"}) #テーブル情報取得
  end
end

local$ rails runner "Tasks::Dynamo.execute"
Running via Spring preloader in process 6438
# <struct Aws::DynamoDB::Types::DescribeTableOutput table=#<struct Aws::DynamoDB::Types::TableDescription attribute_definitions=[#<struct Aws::DynamoDB::Types::AttributeDefinition attribute_name="product_code", attribute_type="S">], table_name="products", key_schema=[#<struct Aws::DynamoDB::Types::KeySchemaElement attribute_name="product_code", key_type="HASH">], table_status="ACTIVE", creation_date_time=2016-10-31 08:20:37 +0000, provisioned_throughput=#<struct Aws::DynamoDB::Types::ProvisionedThroughputDescription last_increase_date_time=1970-01-01 00:00:00 +0000, last_decrease_date_time=1970-01-01 00:00:00 +0000, number_of_decreases_today=0, read_capacity_units=1, write_capacity_units=1>, table_size_bytes=0, item_count=0, table_arn="arn:aws:dynamodb:ddblocal:000000000000:table/products", local_secondary_indexes=nil, global_secondary_indexes=nil, stream_specification=nil, latest_stream_label=nil, latest_stream_arn=nil>>

無事表示された。