NameError in Sessions#new

Question

我得到了#<#:0x2db44c8>when I go tolocalhost:3000/login`的这一错误：undefined local variable or methodsessions_path‘，这对我来说没有多大意义，因为它的代码和以前的应用程序完全一样。

以下是相关文件的代码。

routes.rb

get 'register' => 'users#new', :as => 'register'
get 'login' => 'sessions#new', :as => 'login'
get 'logout' => 'sessions#destroy', :as => 'logout' 

resources :users, :path => '/'

root :to => 'users#index' 
match '/:id' => 'users#show' 

sessions_controller.rb

class SessionsController < ApplicationController
def new
end

def create
    user = User.find_by_email(params[:email])
    if user && user.authenticate(params[:password])
        session[:user_id] = user.id
        redirect_to root_url, :notice => 'Logged in!'
    else
        flash.now.alert = 'Invalid email or password'
        render 'new'
    end
end

def destroy
    session[:user_id] = nil
    redirect_to root_url, :notice => 'Logged out!'
end
end

views/sessions/new.html.erb

<h1>Log in</h1>

<%= form_tag sessions_path do %>
<div class="field"></div>
    <%= label_tag :email %>
    <%= text_field_tag :email, params[:email] %>
</div>
<div class="field"></div>
    <%= label_tag :password %>
    <%= text_field_tag :password %>
</div>
<div class="actions"><%= submit_tag "Log in"%></div>
<% end %>

Answer 1

您没有定义sessions_path --使用rake routes进行验证。要使用sessions_path方法，您需要在路由规范中使用resources :sessions。

说明您的SessionsController，您的路由文件应该看起来像..。

resources :sessions, :only => [:create]
get 'register' => 'users#new', :as => 'register'
get 'login' => 'sessions#new', :as => 'login'
get 'logout' => 'sessions#destroy', :as => 'logout' 

resources :users, :path => '/'

root :to => 'users#index' 
match '/:id' => 'users#show'