Ruby on Rails：Category＃new中的NoMethodError

我一直在关注创建博客的Rails教程。除了文章，我决定创建和分类。但是，我一直在出错

undefined method `categories_path' for #<#<Class:0x3a26d50>:0x37f99f8>

当我一直使用它时，我不知道这是一个错误的变量“ @category”。

耙道：

这是其余的代码：

class CategoryController < ApplicationController

  def index
    @category = Category.all
  end 

  def new
    @category = Category.new
  end

  def edit
    @category = Category.find(params[:id])
  end

  def show
    @category = Category.find(params[:id])  
  end

  def create
    @category = Category.new(category_params)

    if @category.save
      redirect_to @category
    else
      render 'new'
    end
  end

  def update
    @category = Category.find(params[:id])

    if @category.update(category_params)
      redirect_to @category
    else
      render 'edit'
    end
  end   

  def destroy
    @category = Category.find(params[:id])
    @category.destroy

    redirect_to @category
  end

  private
  def category_params
    params.require(:category).permit(:name, :description, :category_primary)
  end

end

new.html.rb

<h1>New category</h1>

<%= render 'form' %>

<%= link_to 'Back', category_path %>

_form.html.rb

<%= form_for @category do |f| %>
  <% if @category.errors.any? %>
  <div id="error_explanation">
    <h2><%= pluralize(@category.errors.count, "error") %> prohibited
      this category from being saved:</h2>
    <ul>
    <% @category.errors.full_messages.each do |msg| %>
      <li><%= msg %></li>
    <% end %>
    </ul>
  </div>
  <% end %>
  <p>
    <%= f.label :name %><br>
    <%= f.text_field :name %>
  </p>

  <p>
    <%= f.label :description %><br>
    <%= f.text_area :description %>
  </p>

  <p>
    <%= f.label :category_primary %><br>
    <%= f.check_box :category_primary %>
  </p>

  <p>
    <%= f.submit %>
  </p>
<% end %>