迁移到 Rails 3 后，未定义方法“reverse_merge”；对于 nil:NilClass

Question

迁移到 Rails 3 后，我遇到了这个问题

undefined method `reverse_merge' for nil:NilClass

activesupport (3.0.7) lib/active_support/whiny_nil.rb:48:in `method_missing'
actionpack (3.0.7) lib/action_controller/metal/url_for.rb:8:in `url_options'
actionpack (3.0.7) lib/action_dispatch/routing/url_for.rb:131:in `url_for'
actionpack (3.0.7) lib/action_dispatch/routing/route_set.rb:195:in `frontend_path'
lib/my_own_login.rb:97:in `login_required'
activesupport (3.0.7) lib/active_support/callbacks.rb:457:in `_run__1711026059__process_action__199225275__callbacks'
activesupport (3.0.7) lib/active_support/callbacks.rb:410:in `send'
activesupport (3.0.7) lib/active_support/callbacks.rb:410:in `_run_process_action_callbacks'
activesupport (3.0.7) lib/active_support/callbacks.rb:94:in `send'
activesupport (3.0.7) lib/active_support/callbacks.rb:94:in `run_callbacks'
actionpack (3.0.7) lib/abstract_controller/callbacks.rb:17:in `process_action'
actionpack (3.0.7) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
activesupport (3.0.7) lib/active_support/notifications.rb:52:in `instrument'

还有其他人遇到过这个错误吗？

在 lib/my_own_login.rb:97

if params[:mode].to_i == 1
  redirect_to root_path
else params[:mode].to_i == 2
  redirect_to frontend_path #Line 97
end

在我的 paths.rb 中

match "/account" => "account#index", :via => :get, :as => :frontend

rake routes | grep frontend

frontend GET    /account(.:format)                                                                    {:action=>"index", :controller=>"account"}

Answer 1

我修复了错误。问题出在以下代码中：

def default_url_options(options={})
  { :org_code => current_organisation.custom_url } if !current_organisation.blank? && !current_organisation.custom_url.blank?
end

我更改为：

def default_url_options(options={})
  if !current_organisation.blank? && !current_organisation.custom_url.blank?
    { :org_code => current_organisation.custom_url }
  else
    {}
  end
end

现在 default_url_options 返回值必须始终散列。