我正在关注 Michael Hartl 的 Rails 指南(第 9 章)。当我尝试访问与用户个人资料对应的页面时,浏览器显示以下错误消息:
NoMethodError in Users#show
Showing /home/jonathan/Desktop/railsTut/sample_app/app/views/users/show.html.erb where line #1 raised:
undefined method `name' for nil:NilClass
Extracted source (around line #1):
1: <% provide(:title, @user.name) %>
2: <div class="row">
3: <aside class="span4">
4: <section>
Rails.root: /home/jonathan/Desktop/railsTut/sample_app
这是我的 users_controller.rb
class UsersController < ApplicationController
before_action :signed_in_user, only: [:edit, :update]
def show
@user = User.find(params[:id])
end
def new
@user = User.new
end
def create
@user = User.new(params[:user]) # Not the final implementation!
if @user.save
sign_in @user
flash[:success] = "Welcome to the Sample App!"
redirect_to @user
else
render 'new'
end
end
def edit
@user = User.find(params[:id])
end
def update
@user = User.find(params[:id])
if @user.update_attributes(params[:user])
flash[:success] = "Profile updated"
sign_in @user
redirect_to @user
else
render 'edit'
end
end
def destroy
User.find(params[:id]).destroy
flash[:success] = "User destroyed."
redirect_to users_url
end
private
def user_params
params.require(:user).permit(:name, :email, :password, :password_confirmation)
end
# Before filters
def signed_in_user
unless signed_in?
store_location
redirect_to signin_url, notice: "Please sign in."
end
end
end
页面加载良好,没有该行:
before_action :signed_in_user, only: [:edit, :update]
但是随着它的包含,事情会出错,我不知道为什么。
另外,这里是 routes.rb
SampleApp::Application.routes.draw do
resources :users
resources :sessions, only: [:new, :create, :destroy]
root to: 'static_pages#home'
match '/signup', to: 'users#new'
match '/signin', to: 'sessions#new'
match '/signout', to: 'sessions#destroy', via: :delete
match '/help', to: 'static_pages#help'
match '/about', to: 'static_pages#about'
match '/contact', to: 'static_pages#contact'
end
任何帮助表示赞赏!