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我刚刚将Rails应用程序从Rails 2.3.8升级到了Rails 3.2.7，并且我遇到了Activerecord的问题。升级到Rails 3后，未定义的方法“接受”nil：NilClass
如果我尝试在所有用ActiveRecord访问我的数据库（例如：Employee.last），我收到以下错误：
NoMethodError: undefined method `accept' for nil:NilClass
from /home/aneyer/.rvm/gems/[email protected]/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb:7:in `to_sql'
from /home/aneyer/.rvm/gems/[email protected]/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb:18:in `select_all'
from /home/aneyer/.rvm/gems/[email protected]/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/query_cache.rb:63:in `select_all'
from /home/aneyer/.rvm/gems/[email protected]/gems/activerecord-3.2.7/lib/active_record/querying.rb:38:in `find_by_sql'
from /home/aneyer/.rvm/gems/[email protected]/gems/activerecord-3.2.7/lib/active_record/explain.rb:40:in `logging_query_plan'
from /home/aneyer/.rvm/gems/[email protected]/gems/activerecord-3.2.7/lib/active_record/querying.rb:37:in `find_by_sql'
from /home/aneyer/.rvm/gems/[email protected]/gems/activerecord-3.2.7/lib/active_record/relation.rb:171:in `exec_queries'
from /home/aneyer/.rvm/gems/[email protected]/gems/activerecord-3.2.7/lib/active_record/relation.rb:160:in `to_a'
from /home/aneyer/.rvm/gems/[email protected]/gems/activerecord-3.2.7/lib/active_record/explain.rb:33:in `logging_query_plan'
from /home/aneyer/.rvm/gems/[email protected]/gems/activerecord-3.2.7/lib/active_record/relation.rb:159:in `to_a'
from /home/aneyer/.rvm/gems/[email protected]/gems/activerecord-3.2.7/lib/active_record/relation/finder_methods.rb:378:in `find_first'
from /home/aneyer/.rvm/gems/[email protected]/gems/activerecord-3.2.7/lib/active_record/relation/finder_methods.rb:122:in `first'
from /home/aneyer/.rvm/gems/[email protected]/gems/activerecord-3.2.7/lib/active_record/relation/finder_methods.rb:336:in `find_one'
from /home/aneyer/.rvm/gems/[email protected]/gems/activerecord-3.2.7/lib/active_record/relation/finder_methods.rb:312:in `find_with_ids'
from /home/aneyer/.rvm/gems/[email protected]/gems/activerecord-3.2.7/lib/active_record/relation/finder_methods.rb:107:in `find'
from /home/aneyer/.rvm/gems/[email protected]/gems/activerecord-3.2.7/lib/active_record/querying.rb:5:in `__send__'
from /home/aneyer/.rvm/gems/[email protected]/gems/activerecord-3.2.7/lib/active_record/querying.rb:5:in `find'
我用Rails 3.2.7与1.8.7红宝石。我之前使用的是mysql 2.7版本，但升级时遇到了错误，所以我现在使用mysql2（0.311）以及activerecord-myql2-adapter（0.0.3）。
这个问题似乎与此类似：
Rails 3: Model.all => NoMethodError: undefined method 'accept' for nil:NilClass
但我想提出有所有的解决方案，并没有一次成功。
编辑： 如果我拿出'activerecord-mysql2-adapter'gem，我会得到以下错误。
Address Load (0.7ms) SELECT `addresses`.* FROM `addresses` LIMIT 1
NoMethodError: undefined method `generated_methods?' for #<Class:0x7f10733eb2e8>
from /home/aneyer/.rvm/gems/[email protected]/gems/activerecord-3.2.7/lib/active_record/dynamic_matchers.rb:50:in `method_missing'
from /home/aneyer/.rvm/gems/[email protected]/gems/markos_validates_timeliness-2.3.2.2/lib/validates_timeliness/active_record/attribute_methods.rb:46:in `define_attribute_methods'
from /home/aneyer/.rvm/gems/[email protected]/gems/activerecord-3.2.7/lib/active_record/attribute_methods.rb:168:in `respond_to?'
from /home/aneyer/.rvm/gems/[email protected]/gems/activesupport-3.2.7/lib/active_support/callbacks.rb:398:in `__run_callback'
from /home/aneyer/.rvm/gems/[email protected]/gems/activesupport-3.2.7/lib/active_support/callbacks.rb:385:in `_run_find_callbacks'
from /home/aneyer/.rvm/gems/[email protected]/gems/activesupport-3.2.7/lib/active_support/callbacks.rb:81:in `send'
from /home/aneyer/.rvm/gems/[email protected]/gems/activesupport-3.2.7/lib/active_support/callbacks.rb:81:in `run_callbacks'
from /home/aneyer/.rvm/gems/[email protected]/gems/activerecord-3.2.7/lib/active_record/base.rb:523:in `init_with'
from /home/aneyer/.rvm/gems/[email protected]/gems/activerecord-3.2.7/lib/active_record/inheritance.rb:68:in `instantiate'
from /home/aneyer/.rvm/gems/[email protected]/gems/activerecord-3.2.7/lib/active_record/querying.rb:38:in `find_by_sql'
from /home/aneyer/.rvm/gems/[email protected]/gems/activerecord-3.2.7/lib/active_record/querying.rb:38:in `collect!'
from /home/aneyer/.rvm/gems/[email protected]/gems/activerecord-3.2.7/lib/active_record/querying.rb:38:in `find_by_sql'
from /home/aneyer/.rvm/gems/[email protected]/gems/activerecord-3.2.7/lib/active_record/explain.rb:40:in `logging_query_plan'
from /home/aneyer/.rvm/gems/[email protected]/gems/activerecord-3.2.7/lib/active_record/querying.rb:37:in `find_by_sql'
from /home/aneyer/.rvm/gems/[email protected]/gems/activerecord-3.2.7/lib/active_record/relation.rb:171:in `exec_queries'
from /home/aneyer/.rvm/gems/[email protected]/gems/activerecord-3.2.7/lib/active_record/relation.rb:160:in `to_a'
from /home/aneyer/.rvm/gems/[email protected]/gems/activerecord-3.2.7/lib/active_record/explain.rb:33:in `logging_query_plan'
from /home/aneyer/.rvm/gems/[email protected]/gems/activerecord-3.2.7/lib/active_record/relation.rb:159:in `to_a'
from /home/aneyer/.rvm/gems/[email protected]/gems/activerecord-3.2.7/lib/active_record/relation/finder_methods.rb:378:in `find_first'
from /home/aneyer/.rvm/gems/[email protected]/gems/activerecord-3.2.7/lib/active_record/relation/finder_methods.rb:122:in `first'
from /home/aneyer/.rvm/gems/[email protected]/gems/activerecord-3.2.7/lib/active_record/querying.rb:5:in `__send__'
from /home/aneyer/.rvm/gems/[email protected]/gems/activerecord-3.2.7/lib/active_record/querying.rb:5:in `first'
什么补丁数量是你在哪里？ Ruby 1.8.7p248和249与rails不兼容。 – Max 2012-08-09 20:15:09
p370。我正在使用新的RVM和1.8.7安装。 – Aaronneyer 2012-08-09 20:17:10