regenerate-migration.rb

#!/usr/bin/env ruby

require 'fileutils'
require 'active_support/core_ext/string' # For underscore method

# Function to extract the migration class name from the file path
def extract_migration_class_name(file_path)
  migration_file_name = File.basename(file_path, '.rb')

  # Convert the rest of the filename (after timestamp) to CamelCase
  migration_file_name.split('_')[1..].map(&:capitalize).join
end

# Function to move the migration file using `git mv`
def move_migration_with_git(old_file_path, new_file_path)
  system("git mv #{old_file_path} #{new_file_path}")
  puts "Renamed migration file from #{old_file_path} to #{new_file_path} using git mv."
end

# Main function to run the script
def process_migration(file_path)
  # Read the contents of the target file into a variable
  migration_contents = File.read(file_path)
  migration_class_name = extract_migration_class_name(file_path)
  system("rm #{file_path}")

  # Run the Rails migration generator
  system("rails generate migration #{migration_class_name}")

  # Get the name of the newly generated migration file
  migrations_path = File.join(Dir.pwd, 'db/migrate')
  new_migration_file = Dir.glob("#{migrations_path}/*.rb").max_by { |f| File.mtime(f) }

  File.open(new_migration_file, 'wb') { _1.puts migration_contents }

  # Output the name of the new migration file
  puts "New migration file created: #{new_migration_file}"

  puts 'Migration update completed successfully.'
end

# Get the file path argument and run the process
if ARGV.length != 1
  puts 'Usage: ruby regenerate_migration.rb path_to_migration_file'
  exit 1
end

file_path = ARGV[0]
process_migration(file_path)