获取：“找不到 SessionsHelper，期望它在 helpers/sessions_helper.rb 中定义”

加载 /login/ 后，我在日志文件中收到以下内容。

Started GET "/login" for 120.138.93.108 at 2016-01-02 03:06:24 +0000

ActionController::RoutingError (Couldn't find SessionsHelper, expected it to be defined in helpers/sessions_helper.rb): app/controllers/application_controller.rb:1:in' app/controllers/sessions_controller.rb:1:in'

但是，sessions_helper.rb 确实存在于 helpers 文件夹中。此外，application_controller.rb和sessions_controller.rb被定义为类，而session_helper.rb被定义为模块。

可能出什么问题了？

我有一个类似的问题：

Couldn't find AgileTeamsHelper, expected it to be defined in helpers/agile_teams_helper.rb

事实证明我在我的助手中定义了这个：

module AgileTeamHelper
  def td_color(text)
    if text == "Green"
      "green-background"
    elsif text == "Yellow"
      "yellow-background"
    elsif text == "Red"
      "red-background"
    end
  end
end

代替：

module AgileTeamsHelper # <-- (Notice the extra s after teams)
  def td_color(text)
    if text == "Green"
      "green-background"
    elsif text == "Yellow"
      "yellow-background"
    elsif text == "Red"
      "red-background"
    end
  end
end

在这种情况下，我缺少“AgileTeamsHelper”中的“s”。我相信 Rails 会寻找与 helper 相同的模块，但采用驼峰式封装。 IE。'agile_teams_helper'.camelize -> "AgileTeamsHelper"