Question

我在使用Hartl的Rails教程时遇到NoMethodError。此错误在第11章中开始显示。不确定将问题追溯到何处。这是错误消息：

NoMethodError in StaticPagesController#home undefined method `signed_in?' for #<StaticPagesController:0x007fa1b44a4ab8>

Rails.root: /Users/dbk/projects/apster

Application Trace | Framework Trace | Full Trace
app/controllers/static_pages_controller.rb:4:in `home'

这是我的StaticPagesController中的代码：

class StaticPagesController < ApplicationController

    def home
        if signed_in?
            @micropost  = current_user.microposts.build
            @feed_items = current_user.feed.paginate(page: params[:page])
        end
    end

end

这是我的ApplicationController：

class ApplicationController < ActionController::Base
  # Prevent CSRF attacks by raising an exception.
  # For APIs, you may want to use :null_session instead.
  protect_from_forgery with: :exception
  include SessionsHelper
end

这是我的会话帮助文件：

    module SessionsHelper

  def sign_in(user)
    session[:user_id] = user.id
  end

  def remember(user)
    user.remember
    cookies.permanent.signed[:user_id] = user.id
    cookies.permanent[:remember_token] = user.remember_token
  end

  def current_user
    if (user_id = session[:user_id])
      @current_user ||= User.find_by(id: session[:user_id])
    elsif (user_id = cookies.signed[:user_id])
      user = User.find_by(id: cookies.signed[:user_id])
      if user && user.authenticated?(cookies[:remember_token])
        log_in user
        @current_user = user
      end
    end
  end

  def logged_in?
    !current_user.nil?
  end

  def forget(user)
    user.forget
    cookies.delete(:user_id)
    cookies.delete(:remember_token)    
  end

  def sign_out
    forget(current_user)
    session.delete(:user_id)
    @current_user = nil
  end


    def redirect_back_or(default)
    redirect_to(session[:return_to] || default)
    session.delete(:return_to)
  end

  def store_location
    session[:return_to] = request.url if request.get?
  end
end

Answer 1

NoMethodError就是这个意思。调用了一个不存在或未加载的方法。这是因为您在logged_in?中调用了方法SessionsHelper。

def logged_in?
  !current_user.nil?
end

但是你在signed_in?中调用了StaticPagesController，但这不存在，因而错误。

def home
  if signed_in?
    # ...
  end
end

在做Hartl的RailsTutorial时的NoMethodError

1 个答案: