升级到Rails 3.1后，任何ActiveRecord调用都会产生以下结果：
ArgumentError: wrong number of arguments (3 for 2)
from /Users/username/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-sqlserver-adapter-3.0.3/lib/active_record/connection_adapters/sqlserver/database_statements.rb:185:in `select'
from /Users/username/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.1.0.rc1/lib/active_record/connection_adapters/abstract/database_statements.rb:9:in `select_all'
from /Users/username/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.1.0.rc1/lib/active_record/connection_adapters/abstract/query_cache.rb:62:in `select_all'
from /Users/username/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.1.0.rc1/lib/active_record/base.rb:469:in `find_by_sql'
from /Users/username/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.1.0.rc1/lib/active_record/relation.rb:106:in `to_a'
from /Users/username/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.1.0.rc1/lib/active_record/relation/finder_methods.rb:155:in `all'
from /Users/username/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.1.0.rc1/lib/active_record/base.rb:440:in `all'
from (irb):1
from /Users/username/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.1.0.rc1/lib/rails/commands/console.rb:44:in `start'
from /Users/username/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.1.0.rc1/lib/rails/commands/console.rb:8:in `start'
from /Users/username/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.1.0.rc1/lib/rails/commands.rb:40:in `<top (required)>'
from script/rails:6:in `require'
from script/rails:6:in `<main>'
其他人遇到此问题？
答案 0 :(得分：11)
检查你的gemfile，你需要最新的mysql2 gem for rails 3才能工作：
替换
gem 'mysql2', '0.2.7'
与
gem 'mysql2', '>=0.3'
并运行“捆绑安装”，你应该好好去
答案 1 :(得分：5)
您还需要更新到sql server适配器的主分支。它将是最终的3.1版本。适配器的3.0版本适用于3.0轨道。所以你的适配器已经过时了。