的Rails 3和Ruby 1.9.2和acts_as_taggable_on不玩很好

Question

我重寫我的Rails應用程序使用Rails 3的工作，當我遷移acts_as_taggable_on遷移我得到這個錯誤：

== CreatePosts: migrating ==================================================== 
-- create_table(:posts) 
rake aborted! 
An error has occurred, this and all later migrations canceled: 

SQLite3::SQLException: table "posts" already exists: CREATE TABLE "posts" ("id" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, "title" varchar(255), "name" varchar(255), "email" varchar(255), "content" text, "created_at" datetime, "updated_at" datetime) 
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.rc/lib/active_record/connection_adapters/abstract_adapter.rb:202:in `rescue in log' 
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.rc/lib/active_record/connection_adapters/abstract_adapter.rb:194:in `log' 
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.rc/lib/active_record/connection_adapters/sqlite_adapter.rb:135:in `execute' 
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.rc/lib/active_record/connection_adapters/abstract/schema_statements.rb:167:in `create_table' 
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.rc/lib/active_record/migration.rb:383:in `block in method_missing' 
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.rc/lib/active_record/migration.rb:359:in `block in say_with_time' 
/usr/local/lib/ruby/1.9.1/benchmark.rb:294:in `measure' 
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.rc/lib/active_record/migration.rb:359:in `say_with_time' 
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.rc/lib/active_record/migration.rb:379:in `method_missing' 
/media/usb0/thenw/db/migrate/20100820173109_create_posts.rb:3:in `up' 
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.rc/lib/active_record/migration.rb:312:in `block in migrate' 
/usr/local/lib/ruby/1.9.1/benchmark.rb:294:in `measure' 
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.rc/lib/active_record/migration.rb:312:in `migrate' 
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.rc/lib/active_record/migration.rb:395:in `migrate' 
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.rc/lib/active_record/migration.rb:537:in `block (2 levels) in migrate' 
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.rc/lib/active_record/migration.rb:611:in `call' 
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.rc/lib/active_record/migration.rb:611:in `block in ddl_transaction' 
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.rc/lib/active_record/connection_adapters/abstract/database_statements.rb:139:in `transaction' 
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.rc/lib/active_record/transactions.rb:204:in `transaction' 
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.rc/lib/active_record/migration.rb:611:in `ddl_transaction' 
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.rc/lib/active_record/migration.rb:536:in `block in migrate' 
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.rc/lib/active_record/migration.rb:523:in `each' 
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.rc/lib/active_record/migration.rb:523:in `migrate' 
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.rc/lib/active_record/migration.rb:433:in `up' 
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.rc/lib/active_record/migration.rb:415:in `migrate' 
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.rc/lib/active_record/railties/databases.rake:140:in `block (2 levels) in <top (required)>' 
/usr/local/lib/ruby/1.9.1/rake.rb:634:in `call' 
/usr/local/lib/ruby/1.9.1/rake.rb:634:in `block in execute' 
/usr/local/lib/ruby/1.9.1/rake.rb:629:in `each' 
/usr/local/lib/ruby/1.9.1/rake.rb:629:in `execute' 
/usr/local/lib/ruby/1.9.1/rake.rb:595:in `block in invoke_with_call_chain' 
/usr/local/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize' 
/usr/local/lib/ruby/1.9.1/rake.rb:588:in `invoke_with_call_chain' 
/usr/local/lib/ruby/1.9.1/rake.rb:581:in `invoke' 
/usr/local/lib/ruby/1.9.1/rake.rb:2041:in `invoke_task' 
/usr/local/lib/ruby/1.9.1/rake.rb:2019:in `block (2 levels) in top_level' 
/usr/local/lib/ruby/1.9.1/rake.rb:2019:in `each' 
/usr/local/lib/ruby/1.9.1/rake.rb:2019:in `block in top_level' 
/usr/local/lib/ruby/1.9.1/rake.rb:2058:in `standard_exception_handling' 
/usr/local/lib/ruby/1.9.1/rake.rb:2013:in `top_level' 
/usr/local/lib/ruby/1.9.1/rake.rb:1992:in `run' 
/usr/local/bin/rake:31:in `<main>' 

我使用Ruby 1.9.2-p0，Rails 3.0.0.rc和Acts_As_Taggable_On 2.0.6。 Acts_As_Taggable_On readme表示它是Ruby 1.9兼容和Rails 3兼容...不知道這裏有什麼問題。任何指針？

Answer 1

我想你應該運行db:migrate:reset重新創建你的表。另一種可能的方法是省略20100820173109_create_posts.rb遷移。