我在摧毁一个物体时遇到了这个问题。
NoMethodError: undefined method `substitute_at' for nil:NilClass
from /usr/local/rvm/gems/ruby-1.9.3-p194@clu2/gems/activerecord-3.2.11/lib/active_record/persistence.rb:135:in `destroy'
from /usr/local/rvm/gems/ruby-1.9.3-p194@clu2/gems/activerecord-3.2.11/lib/active_record/locking/optimistic.rb:103:in `destroy'
from /usr/local/rvm/gems/ruby-1.9.3-p194@clu2/gems/activerecord-3.2.11/lib/active_record/callbacks.rb:254:in `block in destroy'
from /usr/local/rvm/gems/ruby-1.9.3-p194@clu2/gems/activesupport-3.2.11/lib/active_support/callbacks.rb:480:in `_run__348799253__destroy__466331341__callbacks'
from /usr/local/rvm/gems/ruby-1.9.3-p194@clu2/gems/activesupport-3.2.11/lib/active_support/callbacks.rb:405:in `__run_callback'
from /usr/local/rvm/gems/ruby-1.9.3-p194@clu2/gems/activesupport-3.2.11/lib/active_support/callbacks.rb:385:in `_run_destroy_callbacks'
from /usr/local/rvm/gems/ruby-1.9.3-p194@clu2/gems/activesupport-3.2.11/lib/active_support/callbacks.rb:81:in `run_callbacks'
from /usr/local/rvm/gems/ruby-1.9.3-p194@clu2/gems/activerecord-3.2.11/lib/active_record/callbacks.rb:254:in `destroy'
from /usr/local/rvm/gems/ruby-1.9.3-p194@clu2/gems/activerecord-3.2.11/lib/active_record/transactions.rb:254:in `block in destroy'
from /usr/local/rvm/gems/ruby-1.9.3-p194@clu2/gems/activerecord-3.2.11/lib/active_record/transactions.rb:313:in `block in with_transaction_returning_status'
from /usr/local/rvm/gems/ruby-1.9.3-p194@clu2/gems/activerecord-3.2.11/lib/active_record/connection_adapters/abstract/database_statements.rb:192:in `transaction'
from /usr/local/rvm/gems/ruby-1.9.3-p194@clu2/gems/activerecord-3.2.11/lib/active_record/transactions.rb:208:in `transaction'
from /usr/local/rvm/gems/ruby-1.9.3-p194@clu2/gems/activerecord-3.2.11/lib/active_record/transactions.rb:311:in `with_transaction_returning_status'
from /usr/local/rvm/gems/ruby-1.9.3-p194@clu2/gems/activerecord-3.2.11/lib/active_record/transactions.rb:254:in `destroy'
from (irb):1
from /usr/local/rvm/gems/ruby-1.9.3-p194@clu2/gems/railties-3.2.11/lib/rails/commands/console.rb:47:in `start'
from /usr/local/rvm/gems/ruby-1.9.3-p194@clu2/gems/railties-3.2.11/lib/rails/commands/console.rb:8:in `start'
from /usr/local/rvm/gems/ruby-1.9.3-p194@clu2/gems/railties-3.2.11/lib/rails/commands.rb:41:in `<top (required)>'
from script/rails:6:in `require'
答案 0 :(得分：2)
我已修复此问题，我的应用程序的关联名称之一是连接，这是活动记录gem中的保留字：
见第135行 https://github.com/rails/rails/blob/3-2-stable/activerecord/lib/active_record/persistence.rb
我将关联名称从连接更改为其他内容，现在一切正常。
答案 1 :(得分：0)
我发现这是一个铁路问题https://github.com/rails/rails/pull/9371。我认为现在已经解决了。你可以更新你的轨道