没有路由匹配[POST]"/ sessions/new"(导轨4正在运行)

Question

我正在关注Rails 4 In动作书,我遇到了以下错误:

No route matches [POST] "/sessions/new" 

我不知道为什么,因为我已经按照教程去了T.这让我相信教程本身是有缺陷的.无论如何,出于某种原因,它应该发布到会话#new,它应该发布到会话#create.我究竟做错了什么？

sessions_controller.rb

class SessionsController < ApplicationController
  def new
  end

  def create
    user = User.where(:name => params[:signin][:name]).first
      if user && user.authenticate(params[:signin][:password])
        session[:user_id] = user.id
        flash[:notice] = "Signed in successfully."
        redirect_to root_url
      else
    flash[:error] = "Sorry."
    render :new
    end
  end
end

会议/ new.html.erb

<h1>Sign in</h1>
<%= form_for :signin, method: "POST" do |f| %>
  <p>
  <%= f.label :name %><br />
  <%= f.text_field :name %>
  </p>
  <p>
  <%= f.label :password %><br />
  <%= f.password_field :password %>
  </p>
<%= f.submit "Sign in" %>
<% end %>

的routes.rb

  get "/signin", to: "sessions#new"
  post "/signin", to: "sessions#create"

Answer 1

你是对的,这本书有错误.

当你有一个标签的表格

<%= form_for :signin, method: "POST" do |f| %>

如果rails不知道是什么:signin意思,那么它只会复制当前的url并将表单提交给该url(在本例中为'sessions/new'),使用post动词(无论你是否指定它!)

<form accept-charset="UTF-8" action="/sessions/new" method="post">
....

显然,这不一定是你想要的,因为你没有/ sessions/new用于发布HTTP动词,我认为最简单的解决方案是指定路由

post "/signin", to: "sessions#create", as: "signin"

并在您的form_for

<%= form_for signin_path do |f| %>