ruby-on-rails - プログラムでshards.ymlを作成していますか?

Question

Octopus を使用して、Rails アプリケーションの読み取りと書き込みを分離しています。簡単にアクセスできるように、JSON ファイルとラッパー クラスでアプリケーション全体の構成を行います。

shards.ymlここで、JSON 構成ファイルで構成済みのスレーブの数を設定できるように、ファイルを生成して octopus のスレーブ接続を構成したいと考えています。

これは機能します：

<%
# See config.json file for MyApp-specific configuration of web services
require 'myapp/config.rb' 
%>

octopus:
  environments:
    - <%= MyApp::Config::deployment %>
  replicated: true
  fully_replicated: true 
  development:
    slave1:
      host: <%= MyApp::Config::DatabaseSlaves.host(0) %>
      adapter: <%= MyApp::Config::DatabaseSlaves.adapter(0) %>
      database: <%= MyApp::Config::DatabaseSlaves.database(0) %>
      username: <%= MyApp::Config::DatabaseSlaves.username(0) %>
      password: <%= MyApp::Config::DatabaseSlaves.password(0) %>
      reconnect: <%= MyApp::Config::DatabaseSlaves.reconnect(0) %>

そして、これはしません:

<%
# See config.json file for MyApp-specific configuration of web services
require 'myapp/config.rb' 
%>

octopus:
  environments:
    - <%= MyApp::Config::deployment %>
  replicated: true
  fully_replicated: true 
  <%= MyApp::Config::deployment %>:
  <% counter = 1
    while counter <= MyApp::Config::DatabaseSlaves.count do %>
    slave<%= counter.to_s %>:
      host: <%= MyApp::Config::DatabaseSlaves.host(counter - 1) %>
      adapter: <%= MyApp::Config::DatabaseSlaves.adapter(counter - 1) %>
      database: <%= MyApp::Config::DatabaseSlaves.database(counter - 1) %>
      username: <%= MyApp::Config::DatabaseSlaves.username(counter - 1) %>
      password: <%= MyApp::Config::DatabaseSlaves.password(counter - 1) %>
      reconnect: <%= MyApp::Config::DatabaseSlaves.reconnect(counter - 1) %>
  <%
      counter++
    end
  %>

データベースで Webrick または Rake タスクを実行すると、エラーが発生します。

SyntaxError ((erb):23: syntax error, unexpected keyword_end
(erb):25: syntax error, unexpected $end, expecting keyword_end
; _erbout.force_encoding(__ENCODING__)
                                  ^):
/usr/lib/ruby/1.9.1/erb.rb:838:in `eval'
/usr/lib/ruby/1.9.1/erb.rb:838:in `result'
/home/jriepshoff/.bundler/ruby/1.9.1/octopus-4435a53054ee/lib/octopus.rb:22:in `config'
/home/jriepshoff/.bundler/ruby/1.9.1/octopus-4435a53054ee/lib/octopus.rb:64:in `environments'
/home/jriepshoff/.bundler/ruby/1.9.1/octopus-4435a53054ee/lib/octopus.rb:38:in `enabled?'
/home/jriepshoff/.bundler/ruby/1.9.1/octopus-4435a53054ee/lib/octopus/model.rb:51:in `should_use_normal_connection?'
/home/jriepshoff/.bundler/ruby/1.9.1/octopus-4435a53054ee/lib/octopus/model.rb:59:in `connection_with_octopus'
activerecord (4.0.1) lib/active_record/migration.rb:792:in `current_version'
activerecord (4.0.1) lib/active_record/migration.rb:800:in `needs_migration?'
activerecord (4.0.1) lib/active_record/migration.rb:379:in `check_pending!'
activerecord (4.0.1) lib/active_record/migration.rb:366:in `call'
actionpack (4.0.1) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
activesupport (4.0.1) lib/active_support/callbacks.rb:373:in `_run__2591721780440848137__call__callbacks'
activesupport (4.0.1) lib/active_support/callbacks.rb:80:in `run_callbacks'
actionpack (4.0.1) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (4.0.1) lib/action_dispatch/middleware/reloader.rb:64:in `call'
actionpack (4.0.1) lib/action_dispatch/middleware/remote_ip.rb:76:in `call'
actionpack (4.0.1) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
actionpack (4.0.1) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
railties (4.0.1) lib/rails/rack/logger.rb:38:in `call_app'
railties (4.0.1) lib/rails/rack/logger.rb:20:in `block in call'
activesupport (4.0.1) lib/active_support/tagged_logging.rb:67:in `block in tagged'
activesupport (4.0.1) lib/active_support/tagged_logging.rb:25:in `tagged'
activesupport (4.0.1) lib/active_support/tagged_logging.rb:67:in `tagged'
railties (4.0.1) lib/rails/rack/logger.rb:20:in `call'
actionpack (4.0.1) lib/action_dispatch/middleware/request_id.rb:21:in `call'
rack (1.5.2) lib/rack/methodoverride.rb:21:in `call'
rack (1.5.2) lib/rack/runtime.rb:17:in `call'
activesupport (4.0.1) lib/active_support/cache/strategy/local_cache.rb:83:in `call'
rack (1.5.2) lib/rack/lock.rb:17:in `call'
actionpack (4.0.1) lib/action_dispatch/middleware/static.rb:64:in `call'
rack (1.5.2) lib/rack/sendfile.rb:112:in `call'
railties (4.0.1) lib/rails/engine.rb:511:in `call'
railties (4.0.1) lib/rails/application.rb:97:in `call'
rack (1.5.2) lib/rack/lock.rb:17:in `call'
rack (1.5.2) lib/rack/content_length.rb:14:in `call'
rack (1.5.2) lib/rack/handler/webrick.rb:60:in `service'
/usr/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service'
/usr/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run'
/usr/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'

YAML の生成方法についてヒントをいただければ幸いです。私は構文に慣れておらず、自分でテストを含むかなり多くの調査を行いましたが、成功しませんでした。