This project contains the minimum structure to build an application with Rails, PostgreSQL and Docker based stack.

Before start, make sure that you have Docker and Docker Compose installed on your machine.

First, clone this repo into your local machine:

$ git clone [email protected]:douglasgabriel/rails-postgres-docker.git

Move into the project folder and then create a new Rails skeleton by running:

$ docker-compose run app rails new . --force --no-deps --database=postgresql

You now should be able to see the Rails structure created on the project folder.

For Linux users, since Docker runs as root user, you still need to change the owner of the new folders by running sudo chown -R $USER:$USER .

With the Rails base structure defined, you will need to build your app image by running:

$ docker-compose build

To connect the Application with the Database created by Docker it's needed to change the config/database.yml file:

default: &default
  adapter: postgresql
  encoding: unicode
  host: db # this must match the name of the service that you defined on docker-compose.yml
  username: postgres # the default username
  password: root # the password that was defined on docker-compose.yml env vars
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  timeout: 5000

development:
  <<: *default
  database: dev

test:
  <<: *default
  database: test

You is now able to run your application by running:

$ docker-compose up app