ruby-on-rails - Rails システム全体の一意の ID

Question

私はRails 4アプリに取り組んでおり、作成時にRailsアプリのすべてのレコードに自動的に一意のIDを付与したいと考えています. 私はSecureRandom.urlsafe_base64(7, false)IDを作成するために使用しています。私は周りを読んでactive_record.rb、IDを自動的に作成するために独自の構成/初期化子を作成することにしました。active_record.rb には

module UniqueID
  extend ActiveSupport::Concern

  self.primary_key = 'unique_id'
  before_create :set_unique_id

  protected

  def set_unique_id
    loop do
      self.unique_id = SecureRandom.urlsafe_base64(7, false)
      break unless self.find_by_unique_id(self.unique_id)
    end
  end
end

ActiveRecord::Base.send(:include, UniqueID)

しかし、db:migrate を実行すると、

Couldn't create database for {"adapter"=>"postgresql", "encoding"=>"unicode", "database"=>"myapp_test", "pool"=>5, "username"=>"myapp", "password"=>nil}
rake aborted!
undefined method `primary_key=' for UniqueID:Module
/Users/me/RubymineProjects/myapp/config/initializers/active_record.rb:4:in `<module:UniqueID>'
/Users/me/RubymineProjects/myapp/config/initializers/active_record.rb:1:in `<top (required)>'
/Users/me/.rvm/gems/ruby-2.0.0-p195/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:222:in `load'
/Users/me/.rvm/gems/ruby-2.0.0-p195/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:222:in `block in load'
/Users/me/.rvm/gems/ruby-2.0.0-p195/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:213:in `load_dependency'
/Users/me/.rvm/gems/ruby-2.0.0-p195/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:222:in `load'
/Users/me/.rvm/gems/ruby-2.0.0-p195/gems/railties-4.0.0.rc2/lib/rails/engine.rb:609:in `block (2 levels) in <class:Engine>'
/Users/me/.rvm/gems/ruby-2.0.0-p195/gems/railties-4.0.0.rc2/lib/rails/engine.rb:608:in `each'
/Users/me/.rvm/gems/ruby-2.0.0-p195/gems/railties-4.0.0.rc2/lib/rails/engine.rb:608:in `block in <class:Engine>'
/Users/me/.rvm/gems/ruby-2.0.0-p195/gems/railties-4.0.0.rc2/lib/rails/initializable.rb:30:in `instance_exec'
/Users/me/.rvm/gems/ruby-2.0.0-p195/gems/railties-4.0.0.rc2/lib/rails/initializable.rb:30:in `run'
/Users/me/.rvm/gems/ruby-2.0.0-p195/gems/railties-4.0.0.rc2/lib/rails/initializable.rb:55:in `block in run_initializers'
/Users/me/.rvm/gems/ruby-2.0.0-p195/gems/railties-4.0.0.rc2/lib/rails/initializable.rb:44:in `each'
/Users/me/.rvm/gems/ruby-2.0.0-p195/gems/railties-4.0.0.rc2/lib/rails/initializable.rb:44:in `tsort_each_child'
/Users/me/.rvm/gems/ruby-2.0.0-p195/gems/railties-4.0.0.rc2/lib/rails/initializable.rb:54:in `run_initializers'
/Users/me/.rvm/gems/ruby-2.0.0-p195/gems/railties-4.0.0.rc2/lib/rails/application.rb:215:in `initialize!'
/Users/me/.rvm/gems/ruby-2.0.0-p195/gems/railties-4.0.0.rc2/lib/rails/railtie/configurable.rb:30:in `method_missing'
/Users/me/RubymineProjects/myapp/config/environment.rb:5:in `<top (required)>'
/Users/me/.rvm/gems/ruby-2.0.0-p195/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:228:in `require'
/Users/me/.rvm/gems/ruby-2.0.0-p195/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:228:in `block in require'
/Users/me/.rvm/gems/ruby-2.0.0-p195/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:213:in `load_dependency'
/Users/me/.rvm/gems/ruby-2.0.0-p195/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:228:in `require'
/Users/me/.rvm/gems/ruby-2.0.0-p195/gems/railties-4.0.0.rc2/lib/rails/application.rb:189:in `require_environment!'
/Users/me/.rvm/gems/ruby-2.0.0-p195/gems/railties-4.0.0.rc2/lib/rails/application.rb:249:in `block in run_tasks_blocks'
/Users/me/.rvm/gems/ruby-2.0.0-p195@global/gems/rake-10.0.4/lib/rake/task.rb:246:in `call'
/Users/me/.rvm/gems/ruby-2.0.0-p195@global/gems/rake-10.0.4/lib/rake/task.rb:246:in `block in execute'
/Users/me/.rvm/gems/ruby-2.0.0-p195@global/gems/rake-10.0.4/lib/rake/task.rb:241:in `each'
/Users/me/.rvm/gems/ruby-2.0.0-p195@global/gems/rake-10.0.4/lib/rake/task.rb:241:in `execute'
/Users/me/.rvm/gems/ruby-2.0.0-p195@global/gems/rake-10.0.4/lib/rake/task.rb:184:in `block in invoke_with_call_chain'
/Users/me/.rvm/gems/ruby-2.0.0-p195@global/gems/rake-10.0.4/lib/rake/task.rb:177:in `invoke_with_call_chain'
/Users/me/.rvm/gems/ruby-2.0.0-p195@global/gems/rake-10.0.4/lib/rake/task.rb:205:in `block in invoke_prerequisites'
/Users/me/.rvm/gems/ruby-2.0.0-p195@global/gems/rake-10.0.4/lib/rake/task.rb:203:in `each'
/Users/me/.rvm/gems/ruby-2.0.0-p195@global/gems/rake-10.0.4/lib/rake/task.rb:203:in `invoke_prerequisites'
/Users/me/.rvm/gems/ruby-2.0.0-p195@global/gems/rake-10.0.4/lib/rake/task.rb:183:in `block in invoke_with_call_chain'
/Users/me/.rvm/gems/ruby-2.0.0-p195@global/gems/rake-10.0.4/lib/rake/task.rb:177:in `invoke_with_call_chain'
/Users/me/.rvm/gems/ruby-2.0.0-p195@global/gems/rake-10.0.4/lib/rake/task.rb:205:in `block in invoke_prerequisites'
/Users/me/.rvm/gems/ruby-2.0.0-p195@global/gems/rake-10.0.4/lib/rake/task.rb:203:in `each'
/Users/me/.rvm/gems/ruby-2.0.0-p195@global/gems/rake-10.0.4/lib/rake/task.rb:203:in `invoke_prerequisites'
/Users/me/.rvm/gems/ruby-2.0.0-p195@global/gems/rake-10.0.4/lib/rake/task.rb:183:in `block in invoke_with_call_chain'
/Users/me/.rvm/gems/ruby-2.0.0-p195@global/gems/rake-10.0.4/lib/rake/task.rb:177:in `invoke_with_call_chain'
/Users/me/.rvm/gems/ruby-2.0.0-p195@global/gems/rake-10.0.4/lib/rake/task.rb:170:in `invoke'
/Users/me/.rvm/gems/ruby-2.0.0-p195@global/gems/rake-10.0.4/lib/rake/application.rb:143:in `invoke_task'
/Users/me/.rvm/gems/ruby-2.0.0-p195@global/gems/rake-10.0.4/lib/rake/application.rb:101:in `block (2 levels) in top_level'
/Users/me/.rvm/gems/ruby-2.0.0-p195@global/gems/rake-10.0.4/lib/rake/application.rb:101:in `each'
/Users/me/.rvm/gems/ruby-2.0.0-p195@global/gems/rake-10.0.4/lib/rake/application.rb:101:in `block in top_level'
/Users/me/.rvm/gems/ruby-2.0.0-p195@global/gems/rake-10.0.4/lib/rake/application.rb:110:in `run_with_threads'
/Users/me/.rvm/gems/ruby-2.0.0-p195@global/gems/rake-10.0.4/lib/rake/application.rb:95:in `top_level'
/Users/me/.rvm/gems/ruby-2.0.0-p195@global/gems/rake-10.0.4/lib/rake/application.rb:73:in `block in run'
/Users/me/.rvm/gems/ruby-2.0.0-p195@global/gems/rake-10.0.4/lib/rake/application.rb:160:in `standard_exception_handling'
/Users/me/.rvm/gems/ruby-2.0.0-p195@global/gems/rake-10.0.4/lib/rake/application.rb:70:in `run'
-e:1:in `load'
-e:1:in `<main>'
Tasks: TOP => db:migrate:reset => db:migrate => environment
(See full trace by running task with --trace)

なぜこれが起こっているのか、これを行うためのより良い方法はありますか?

更新: include i を使用すると、次のようになります。

rake aborted!
An error has occurred, this and all later migrations canceled:

undefined method `unique_id=' for #<ActiveRecord::SchemaMigration version: "20130623171324">

移行

class AddUniqueIdToUsers < ActiveRecord::Migration
  def change
    add_column :users, :unique_id, :string
  end
end

score 1 · Accepted Answer

インクルードされたブロック内にロジックを移動する必要があると思いますか? このような

included do
  self.primary_key = 'unique_id'
  before_create :set_unique_id
end

- 編集 -

メソッドを次のように変更することもできます

def set_unique_id
  loop do
    self.id = SecureRandom.urlsafe_base64(7, false)
    break unless self.find(self.id)
  end
end

score 0 · Accepted Answer

includedブロックでラップするとうまくいくはずです。そのようです：

included do
  primary_key = 'unique_id'
  before_create :set_unique_id
end

ruby-on-rails - Rails システム全体の一意の ID

2 に答える 2

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