rails没有路由匹配[POST]

Question

使用rails 4我有一个Userbookrank类，用户在库中对一本书进行排名，该表包括user_id，book_id和rank。 userbookranks_controller.rb如下：

class UserbookranksController < ApplicationController
  def new
    @book = Book.find(params[:book_id])
    @user = User.find(params[:user_id])
    @userbookrank = Userbookrank.new
  end

  def create
    @userbookrank = Userbookrank.new(userbookrank_params)
    if @userbookrank.save
      redirect_to userbookrank_path(@userbookrank)
    else
      redirect_to :root
    end
  end

  def show
    @userbookrank = Userbookrank.find(params[:id])
  end

  private
  def userbookrank_params
    params.require(:userbookrank).permit(:user_id, :book_id, :rank)
  end
end

和new.html.erb文件如下：

排一本书

<p> Book title: %=@book.title % </p>
<p> Book author: %=@book.author.name % </p>
<%=form_for :userbookrank do |f| %>
  <%=f.hidden_field :book_id, :value => @book.id%>
  <%=f.hidden_field :user_id, :value => current_user.id%>
  <p> 
    <%=f.label :rank %>
    <br>
    <%=f.number_field :rank %>
  </p>
  <p>     
    <%=f.submit "Rank book"%>
  </p>
<% end %>

show.html.erb文件如下：你排名的书是......

<p>Title: <%=@userbookrank.book.title %> </p>  
<p>Author: <%=@userbookrank.book.author.name %> </p>   
<p>Rank: <%=@userbookrank.rank %> </p>    
<p> <%=link_to 'Back to the book menu', userbookranks_path %> </p>

routes文件包括以下内容：

resources :userbookranks

当我提交排名时会出现路由错误： No route matches [POST] "/userbookranks/new"

佣金路线包括以下内容：

userbookranks_path  GET     /userbookranks(.:format)    userbookranks#index
    POST    /userbookranks(.:format)    userbookranks#create
new_userbookrank_path   GET     /userbookranks/new(.:format)    userbookranks#new
edit_userbookrank_path  GET     /userbookranks/:id/edit(.:format)   userbookranks#edit
userbookrank_path   GET     /userbookranks/:id(.:format)    userbookranks#show
    PATCH   /userbookranks/:id(.:format)    userbookranks#update
    PUT     /userbookranks/:id(.:format)    userbookranks#update
    DELETE  /userbookranks/:id(.:format)    userbookranks#destroy 

非常感谢你提前。

Answer 1

在new.html.haml ，使用在新操作中初始化的@userbookrank对象。

<p> Book title: %=@book.title % </p>
<p> Book author: %=@book.author.name % </p>
<%=form_for @userbookrank do |f| %>
  <%=f.hidden_field :book_id, :value => @book.id%>
  <%=f.hidden_field :user_id, :value => current_user.id%>
  <p> 
    <%=f.label :rank %>
    <br>
    <%=f.number_field :rank %>
  </p>
  <p>     
    <%=f.submit "Rank book"%>
  </p>
<% end %>

Answer 2

你应该将new.html.erb改为

<%=form_for @userbookrank do |f| %>