• Sinatra - 2.0.7
• Sequel
• PostgresQL
• Puma

• Use ruby version 2.6.3

• In the root directory run command bundle install

• Copy .env.sample into .env

• Create manually database with name sinatra_rest_api

• Run migrations with command rake db:migrate

Inside root folder enter this commands in terminal:

rake shot

Inside root folder run next command:

rake c

Or

rake console

Console give access to the models, and allow to make all CRUD operations with database.