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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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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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def save_and_open_page
  dir = "#{Rails.root}/tmp/cache/capybara"
  file = "#{dir}/#{Time.now.strftime('%Y-%m-%d-%H-%M-%S')}.png"
  FileUtils.mkdir_p dir
  page.driver.render file
  wait_until { File.exists?(file) }
  system "open #{file}"
end

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Rails naming conventions

General Ruby conventions

Class names are CamelCase.

Methods and variables are snake_case.

Methods with a ? suffix will return a boolean.

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git branch -m old_branch new_branch         # Rename branch locally    
git push origin :old_branch                 # Delete the old branch    
git push --set-upstream origin new_branch   # Push the new branch, set local branch to track the new remote