[Docker] Rails 5.2 environment construction with docker

FROM ruby:2.5
RUN apt-get update && apt-get install -y \
      build-essential \
      libpg-dev \
      nodejs \
      postgresql-client \
      yarn
WORKDIR /product-register
COPY Gemfile Gemfile.lock /product-register/
RUN bundle install

version: '3'
services:
  web:
    build: .    //image If you get an image:Image name
    ports:
      - '3000:3000'
    volumes:
      - '.:/product-register'
    tty: true
    stdin_open: true

source 'https://rubygems.org'
gem 'rails', '~> 5.2'

$ docker-compose up -d 
$ docker-compose exec web bash
:/product-register# rails new . --force --database=postgresql -skip-bundle //gemfile is updated
$ docker-compose down //Drop the container once to update the gemfile
$ docker-compose up --build -d To use the newly built image of dockerfile--Add build
$ docker-compose exec web bash //Enter again
:/product-register# rails s -b 0.0.0.0 //I get an error because the db is not set yet

adapter: postgresql
  encoding: unicode
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  host: db                  
  user: postgres       
  port: 5432
  password: <%= ENV.fetch("DATABASE_PASSWORD") %> 

version: '3'

volumes:
  db-data:             //I am making docker volume
services:
  web:
    build: .
    ports:
      - '3000:3000'
    volumes:
      - '.:/app'
    environment:
      - 'DATABASE_PASSWORD=postgres'
    tty: true
    stdin_open: true
    depends_on:
      - db
    links:
      - db
  
  db:
    image: postgres
    volumes:
      - 'db-data:/var/lib/postgresql/data'　　　　//I'm mounting the docker volume I made above
    environment:                      
      - 'POSTGRES_PASSWORD=postgres'   //Seems to have been needed recently

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