Edited at

dynamoidをlocalで動かし、dynamo-adminで確認するdocker-compose

clone && build && up && create dynamodb data

git clone git@github.com:kajirikajiri/dynamo_test.git

cd dynamo_test
docker-compose build
docker-compose up -d
docker-compose run --rm rails bash
rails c
User.new.save

open browser and check

http://localhost:8001/

tell me if you find a bug