捕获轨道控制器中的所有异常

有没有办法在rails控制器中捕获所有未捕获的异常，如下所示：

def delete
  schedule_id = params[:scheduleId]
  begin
    Schedules.delete(schedule_id)
  rescue ActiveRecord::RecordNotFound
    render :json => "record not found"
  rescue ActiveRecord::CatchAll
    #Only comes in here if nothing else catches the error
  end
  render :json => "ok"
end

谢谢

---

begin
  # do something dodgy
rescue ActiveRecord::RecordNotFound
  # handle not found error
rescue ActiveRecord::ActiveRecordError
  # handle other ActiveRecord errors
rescue # StandardError
  # handle most other errors
rescue Exception
  # handle everything else
  raise
end

---

你也可以定义一个rescue_from方法。

class ApplicationController < ActionController::Base
  rescue_from ActionController::RoutingError, :with => :error_render_method

  def error_render_method
    respond_to do |type|
      type.xml { render :template => "errors/error_404", :status => 404 }
      type.all  { render :nothing => true, :status => 404 }
    end
    true
  end
end

根据你的目标是什么，你可能也想考虑不在每个控制器的基础上处理异常。 相反，请使用像exception_handler gem这样的方式来持续管理对异常的响应。 作为奖励，这种方法还将处理发生在中间件层的异常，例如请求解析或数据库连接错误，您的应用程序看不到。 exception_notifier gem也可能是有趣的。

---

您可以按类型捕获异常：

rescue_from ::ActiveRecord::RecordNotFound, with: :record_not_found
rescue_from ::NameError, with: :error_occurred
rescue_from ::ActionController::RoutingError, with: :error_occurred
# Don't resuce from Exception as it will resuce from everything as mentioned here "http://stackoverflow.com/questions/10048173/why-is-it-bad-style-to-rescue-exception-e-in-ruby" Thanks for @Thibaut Barrère for mention that
# rescue_from ::Exception, with: :error_occurred 

protected

def record_not_found(exception)
  render json: {error: exception.message}.to_json, status: 404
  return
end

def error_occurred(exception)
  render json: {error: exception.message}.to_json, status: 500
  return
end

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