Question

来自RUBY ON RAILS TUTORIAL，Michael Hartl。第7章我有一个问题。如果操作员不工作
我试图做新的应用程序，但仍然没有 application.html.erb：

    <nav>
    <ul class="nav navbar-nav navbar-right">
      <li><%= link_to "Home", root_path %></li>
      <% if logged_in? %>
          <li><%= link_to "Users", '#' %></li>
          <li class="dropdown">
            <a href="#" class="dropdown-toggle" data-toggle="dropdown">
              Account <b class="caret"></b>
            </a>
            <ul class="dropdown-menu">
              <li><%= link_to "Profile", current_user %></li>
              <li><%= link_to "Settings", '#' %></li>
              <li class="divider"></li>
              <li>
                <%= link_to "Log out", logout_path, method: "delete" %>
              </li>
            </ul>
          </li>
      <% else %>
          <li><%= link_to "Log in", login_path %></li>
      <% end %>
    </ul>
  </nav>

session_helper.rb：

module SessionsHelper

  # Logs in the given user.
  def log_in(user)
    session[:user_id] = user.id
  end

  def remember(user)

    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: user_id)
    elsif (user_id = cookies.signed[:user_id])
      user = User.find_by(id: user_id)
      if user && user.authenticated?(:remember, 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

  # Logs out the current user.
  def log_out
    session.delete(:user_id)
    @current_user = nil
  end
end

users_controller.rb：

class UsersController < ApplicationController
  before_action :correct_user,   only: [:edit, :update]
  def index
    @users = User.all
  end


  def show
    @user = User.find(params[:id])
    @microposts = @user.microposts(page: params[:page])
  end
  def new
    @user = User.new
  end
  def create
    @user = User.new(user_params)
    if @user.save
      flash[:success] = "Welcome to the Sample App!"
      redirect_to @user
    else
      render 'new'
    end
  end
  def edit
    @user = User.find(params[:id])
  end
  private

  def user_params
    params.require(:user).permit(:name, :email, :password,
                                 :password_confirmation)
  end
end

我猜logged_in不起作用，但我找不到错误。当我定义注销方法时，该按钮不会从“登录”

更改

Answer 1

您的ApplicationController看起来如何？

在logged_in?开始工作之前，您需要将其包含为helper_method。这样的东西，在ApplicationController中：

class ApplicationController < ActionController::Base
  include SessionsHelper
  helper_method :logged_in?
end

Here is the documentation for helper_method

Answer 2

在current_user模块的SessionsHelper方法中，使用以下代码

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

您已使用=运算符进行比较而不是==。

如果操作员不工作

2 个答案: