将旧数据库导入 Rails 中的新模式

Question

我想将旧数据库导入 rails 中的新模式。为此，我有 .rake 文件：

# /lib/tasks/project_name.rake: 

namespace :project_name do
  require Rails.root + "lib/tasks/importer"

  desc "Import old database, usage: rake project_name:import['old_database_name']"
  task :import, :oldDatabase, needs::environment do |t, args|
    args.with_defaults(oldDatabase: "import")

    oldDatabaseName = args.oldDatabse
    newDatabaseName = YAML::load(IO.read(Rails.root.join("config/database.yml")))[Rails.env]["database"]

    importer = Importer.new newDatabaseName, oldDatabaseName
    importer.execute
  end
end

但是在添加该文件后我什至无法使用任何 rake 命令。这是一些跟踪行：

no implicit conversion of pathname into string
/Users/user/Desktop/rails/dis/lib/tasks/project_name.rake:2:in `block in <top (required)>'
/Users/user/Desktop/rails/dis/lib/tasks/project_name.rake:1:in `<top (required)>'

我正在通过查看本教程来做到这一点：

http://www.frick-web.at/blog/import-old-database-in-new-schema-with-mysql-and-rails

Answer 1

尝试

require Rails.root.join("lib/tasks/importer").to_s

将旧数据库导入 Rails 中的新模式

Import old database into new schema in Rails

ruby

import

rake

ruby-on-rails

ruby-on-rails-4