試圖使用ActiveRecord與Sinatra，遷移失敗問題

運行Sinatra 1.0，我想添加一個數據庫表到我的程序。在我的Rakefile我有一個任務試圖使用ActiveRecord與Sinatra，遷移失敗問題

task :environment do 
    ActiveRecord::Base.establish_connection(YAML::load(File.open('config/database.yml'))["development"])  
end

我有我的命名空間遷移任務調用遷移代碼：

namespace :related_products do 
     desc "run any migrations we may have in db/migrate" 
     task :migrate => :environment do 
     ActiveRecord::Migrator.migrate('db/migrate', ENV["VERSION"] ? ENV["VERSION"].to_i : nil) 
    end

我的控制檯pukes了一個錯誤，當調用的ActiveRecord ::遷移。 migrate（）被創建。 rake中止！未定義的方法'info'爲零：NilClass

遷移代碼本身非常簡單...並且沒有提示我這個缺失的信息類是什麼線索。

class CreateStores < ActiveRecord::Migration 
     def self.up  
     create_table :stores do |t| 
      t.string :name 
      t.string :access_url 
      t.timestamps 
     end 
     end 

     def self.down 
     drop_table :stores 
     end 
    end

我在這裏有點神祕，正在尋找一些線索，看看可能是錯的。謝謝！

簡單回溯顯示了進攻線僅僅是調用遷移：

rake aborted! 
undefined method `info' for nil:NilClass 
/Library/Ruby/Gems/1.8/gems/activerecord-2.3.5/lib/active_record/migration.rb:473:in `migrate' 
/Library/Ruby/Gems/1.8/gems/activerecord-2.3.5/lib/active_record/migration.rb:472:in `each' 
/Library/Ruby/Gems/1.8/gems/activerecord-2.3.5/lib/active_record/migration.rb:472:in `migrate' 
/Library/Ruby/Gems/1.8/gems/activerecord-2.3.5/lib/active_record/migration.rb:400:in `up' 
/Library/Ruby/Gems/1.8/gems/activerecord-2.3.5/lib/active_record/migration.rb:383:in `migrate' 
/Users/baz/Documents/workspace/rp/Rakefile:26 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `call' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `execute' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `each' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `execute' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:597:in `invoke_with_call_chain' 
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/monitor.rb:242:in `synchronize' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:583:in `invoke' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:2051:in `invoke_task' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `each' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:2023:in `top_level' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:2001:in `run' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:1998:in `run' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/bin/rake:31 
/usr/bin/rake:19:in `load' 
/usr/bin/rake:19

來源

2010-05-31 David Lazar

我們能看到一個回溯？相關行似乎不在代碼中提供... – Matchu 2010-05-31 00:22:18

我添加了我得到的回溯。第26行只是調用ActiveRecord :: Migrator.migrate – 2010-05-31 00:43:36

我只是碰到了同樣的問題，並修復是給ActiveRecord的在哪裏輸出日誌信息的一些信息。

添加以下到我的Rake文件

ActiveRecord::Base.logger = Logger.new(STDOUT) 
ActiveRecord::Migration.verbose = true

-Timmy

來源

2010-06-29 16:20:10 timmyc

我確實有一些問題（Heroku/Sinatra/AR），並且此解決方案完美運行。謝謝！ – 2010-07-06 12:34:14

謝謝你。很高興有這樣一個問題解決。 – 2010-07-10 03:38:15

試圖使用ActiveRecord與Sinatra，遷移失敗問題

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