コメントを利用してマイグレーションファイルからロケール(yaml)を作成

locale_from_migration.rb

require 'psych' # to_yamlを使うため

def table_name(line)
  line.scan(/create_table :(.+), comment: \"(.+)"/)
  $LOCALE["ja"]["activerecord"]["models"][$1] = $2
  $LOCALE["ja"]["activerecord"]["attributes"][$1] = {}
  $1
end

def column_name(line)
  line.scan(/:(.+?),.+comment: \"(.+)\"/)
  $LOCALE["ja"]["activerecord"]["attributes"][@t][$1] = $2
end

def timestamps
  $LOCALE["ja"]["activerecord"]["attributes"][@t]["created_at"] = "作成日時"
  $LOCALE["ja"]["activerecord"]["attributes"][@t]["updated_at"] = "更新日時"
end

$LOCALE = {
  "ja" => {
    "activerecord" => {
      "attributes"=> {},
      "models"    => {},
    }
  }
}

files = Dir.glob("db/migrate/*_create_*.rb")
files.each do |file|
  migration = open(file).read
  column_flg = false
  migration.each_line do |line|
    case line
    when /create_table/
      @t = table_name(line) 
      column_flg = true
    when /end/
      column_flg = false
    when /timestamps/
      timestamps if column_flg
    else
      column_name(line) if column_flg
    end
  end
end

puts $LOCALE.to_yaml