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my_phoenix_api
├── lib
│   ├── my_phoenix_api
│   │   ├── domain
│   │   │   ├── models
│   │   │   │   ├── user.ex                # Domain logic (User entity)
│   │   │   │   └── post.ex                # Domain logic (Post entity)
│   │   │   ├── services
│   │   │   │   ├── user_service.ex        # Service for user-related business logic

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docker-compose file

version: "2.2"
services:
  kafka:
    image: confluentinc/cp-kafka:latest
    container_name: kafka
    ports:
 - "9092:9092"

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---
version: '2'
services:
  zookeeper:
    image: confluentinc/cp-zookeeper:latest
    environment:
      ZOOKEEPER_CLIENT_PORT: 2181
      ZOOKEEPER_TICK_TIME: 2000

  kafka:

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# Install protobuf 
# more info: https://grpc.io/docs/protoc-installation/

sudo apt install -y protobuf-compiler

# Install curl for GRPC support via ASDF package manager 
asdf install grpcurl 1.8.0

# Ensure protobuf available

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psql -h localhost -U postgres -d postgres -c "copy (select datname from pg_database where datname like '%nominapp_api%') to stdout" | while read line; do
  echo "$line"
  dropdb -i "$line"
done

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# pass the backup to container
docker cp latest.dump quincename_db_1:/var/lib/postgresql/data

# exec backup
docker exec quincename_db_1 pg_restore --no-owner --verbose --clean --no-acl -U postgres -d quincename_development /var/lib/postgresql/data/latest.dump

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sudo docker pull postgres:latest

mkdir -p $HOME/docker/volumes/postgres

sudo docker run --rm   --name pg-docker -e POSTGRES_PASSWORD=docker -d -p 5432:5432 -v $HOME/docker/volumes/postgres:/var/lib/postgresql/data  postgres

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class RenameReadColumToState < ActiveRecord::Migration
  def change
    add_column :messages, :state, :integer, default: 0

    execute "UPDATE messages SET state = CAST(read AS INTEGER);"

    remove_column :messages, :read
  end
end

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require 'csv'
data = [{'a' => 'aaaa', 'b' => 'bbbb'}]
column_names = data.first.keys
s=CSV.generate do |csv|
  csv << column_names
  data.each do |x|
    csv << x.values
  end
end
File.write('the_file.csv', s)

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  template = ERB.new(@template)
      template.def_method(LayoutRenderer, 'render')

      result = LayoutRenderer.new.render do
        ERB.new(@content).result(binding)
      end

      File.open('tmp/payslip_filename.html', 'w+') do |f|
        f.write result
      end