邮政邮件服务器代码库； “登录？” ApplicationController 中未定义的方法

Question

我几天前才知道邮政，我对它免费提供的所有开箱即用的功能感到非常兴奋。但作为一名初级 Rails 开发人员，我很想尝试一下它，看看我是否可以添加自己的功能。我已经设法设置它并让它工作。但我有一个问题。我似乎不完全了解应用程序控制器中发生了什么。有一种方法“logged_in？”这得到了很多使用。但它没有在代码库中的任何地方定义。而且我似乎没有找到任何 gem 提供这种方法让我猜测它会自动加载到代码中，就像 rails 对其他一些模块所做的那样。下面是代码：

require "authie/session"

class ApplicationController < ActionController::Base

  protect_from_forgery with: :exception

  before_action :login_required
  before_action :set_timezone

  rescue_from Authie::Session::InactiveSession, with: :auth_session_error
  rescue_from Authie::Session::ExpiredSession, with: :auth_session_error
  rescue_from Authie::Session::BrowserMismatch, with: :auth_session_error

  private

  def login_required
    return if logged_in?

    redirect_to login_path(return_to: request.fullpath)
  end

  def admin_required
    if logged_in?
      unless current_user.admin?
        render plain: "Not permitted"
      end
    else
      redirect_to login_path(return_to: request.fullpath)
    end
  end

  def require_organization_owner
    return if organization.owner == current_user

    redirect_to organization_root_path(organization), alert: "This page can only be accessed by the organization's owner (#{organization.owner.name})"
  end

  def auth_session_error(exception)
    Rails.logger.info "AuthSessionError: #{exception.class}: #{exception.message}"
    redirect_to login_path(return_to: request.fullpath)
  end

  def page_title
    @page_title ||= ["Postal"]
  end
  helper_method :page_title

  def redirect_to_with_return_to(url, *args)
    if params[:return_to].blank? || !params[:return_to].starts_with?("/")
      redirect_to url_with_return_to(url), *args
    else
      redirect_to url_with_return_to(url), *args
    end
  end

  def set_timezone
    Time.zone = logged_in? ? current_user.time_zone : "UTC"
  end

  def append_info_to_payload(payload)
    super
    payload[:ip] = request.ip
    payload[:user] = logged_in? ? current_user.id : nil
  end

  def url_with_return_to(url)
    if params[:return_to].blank? || !params[:return_to].starts_with?("/")
      url_for(url)
    else
      params[:return_to]
    end
  end

  def redirect_to_with_json(url, flash_messages = {})
    if url.is_a?(Array) && url[0] == :return_to
      url = url_with_return_to(url[1])
    else
      url = url_for(url)
    end

    flash_messages.each do |key, value|
      flash[key] = value
    end
    respond_to do |wants|
      wants.html { redirect_to url }
      wants.json { render json: { redirect_to: url } }
    end
  end

  def render_form_errors(action_name, object)
    respond_to do |wants|
      wants.html { render action_name }
      wants.json { render json: { form_errors: object.errors.full_messages }, status: :unprocessable_entity }
    end
  end

  def flash_now(type, message, options = {})
    respond_to do |wants|
      wants.html do
        flash.now[type] = message
        if options[:render_action]
          render options[:render_action]
        end
      end
      wants.json { render json: { flash: { type => message } } }
    end
  end

  def login(user)
    if logged_in?
      auth_session.invalidate!
      reset_session
    end
    Authie::Session.start(self, user: user)
    @current_user = user
  end

end

Answer 1

显然它是从 Authie gem 加载的。我是怎么知道的？

new_app_controller = ApplicationController.new
location = new_app_controller.method(:logged_in?).source_location
puts "defined in #{location}"