环境：
- 导轨 3.2.3
- Mac OS X 狮子
- Ruby-1.9.3-p194 (MRI)
我有一个 rails 应用程序，我使用 app/views/layouts/application.html.erb 作为一些我用作菜单选项的链接的“左导航窗格”。
菜单中有两个使用 link_to 的链接（此处为简洁起见）。如果我删除一个链接并运行该应用程序，则剩余的链接会执行它应该做的事情。如果我删除第二个链接并恢复第一个链接，则第一个链接会执行 IT 应该做的事情。
但是，如果我同时在菜单中有两个链接，单击其中一个将起作用，但单击第二个会产生运行时错误。
使用 Pry 和 Rails 源代码本身 (3.2.3)，我已经确定了框架中发生错误的位置。异常发生在 actionpack-3.2.3/lib/action_view/template.rb 中，并且发生在以下代码行的 render 方法中：
def render(view, locals, buffer=nil, &block)
ActiveSupport::Notifications.instrument("!render_template.action_view", :virtual_path => @virtual_path) do
compile!(view)
view.send(method_name, locals, buffer, &block) # <----ERROR OCCURS HERE
end
rescue Exception => e
handle_render_error(view, e)
end
method_name 的值 = _app_views_layouts_application_html_erb___1387085669206687706_70334317584180
视图上有一个同名的方法。执行“发送”时，会生成以下异常。
ActionController::RoutingError: No route matches {:action=>"signup_for_role",
:controller=>"assignments", :club_id=>nil, :member_id=>[#<Member id: 2, first_name:
"Joseph", last_name: "Smith", start_date: "2012-01-01", end_date: "9999-12-31",
created_at: "2012-04-07 13:58:46", updated_at: "2012-05-06 21:54:12", club_id: 2, email:
"joe.smith@gmail.com", assignable: true, address_one: nil, address_two: nil, city: nil,
state: nil, zip_code: nil, phone: nil, mobile_phone: nil>]}
因为方法中的代码是由 Rails 生成的，而不是在源代码文件中，所以我无法使用 Pry 单步执行它；我只能“发送”消息并查看结果。
这是布局中的代码，其中包含有问题的两个链接：
<!DOCTYPE html>
<html>
<head>
<title>MyApp</title>
<%= stylesheet_link_tag "application" %>
<%= javascript_include_tag "application" %>
<%= csrf_meta_tags %>
</head>
<body>
<div style='padding-left:10px; margin-top:10px; ' >
<div class='container' style='margin-top:50px; margin-left:50px;padding-right:200px; '>
<!-- This link_to works, whether alone, or when the other link_to is present -->
<%= link_to "Sign Up for a Role", signup_for_role_club_member_assignments_path(params[:club_id], current_user_as_member) %>
<br/><br/>
<!-- This link_to fails when both link_to's are present, but works when the other link_to is removed. -->
<%= link_to "Clubs", clubs_path %><br>
</div>
<!-- ***************************************************************** -->
<!-- Yield below... this is where the currently selected view displays -->
<!-- ***************************************************************** -->
<div class='container' style='margin-left:200px' >
<%= yield %>
</div>
</div>
</body>
</html>
最后，这是我的 routes.rb 文件：
Rolemaster::Application.routes.draw do
resources :sessions
resources :enrollments
resources :logs
resources :clubs do
resources :members do
resources :assignments do
collection do
get 'signup_for_role'
get 'display_success'
get 'past_activity'
end
end
resources :absences
end
resources :roles
resources :role_groups
resources :meetings do
get 'forassignment', :on => :collection
get 'print'
resources :assignments
end
resources :assignments do
post 'generate', :on => :collection
end
resources :absences do
get 'list', :on => :collection
end
end
resources :users do
put "update_password" => "users#update_password"
put "update_email" => "users#update_email"
get "edit_password" => "users#edit_password"
get "edit_email" => "users#edit_email"
end
match "agendas/print"
get "enrollments/new"
post "enrollments/create"
get "log_in" => "sessions#new", :as => "log_in"
get "log_out" => "sessions#destroy", :as => "log_out"
get "sign_up" => 'users#new', :as => 'sign_up'
get "test/email"
get "sessions/revoke_admin"
get "sessions/revoke_super_user"
get "admins" => "admins#index"
root :to => 'sessions#new'
end
任何帮助是极大的赞赏。到目前为止，我可能已经为此花费了 20 个小时或更长时间。