未定义的局部变量或方法“产品”

Question

我想在show 页面上创建，但我的代码无效。

模型看起来像 - ＆gt;用户

Gv$session

产品型号 - ＆gt;

class User < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable
  belongs_to :plan
  has_one :profile
  attr_accessor :stripe_card_token

  def save_with_payment
    if valid?
      customer = Stripe::Customer.create(description: email, plan: plan_id, card: stripe_card_token)
      self.stripe_customer_token = customer.id
      save!
    end
  end
end

评论模型 - ＆gt;

class Product < ActiveRecord::Base
    mount_uploader :image, ImageUploader

    has_one :opsystem, class_name: "Opsystem",
                        foreign_key: "opsystem_id"
    validates_presence_of :name, :price
    validates_numericality_of :price

    attr_accessor :name
    has_many :comments, dependent: :destroy
    def opsystem

    end
end

产品控制器 - ＆gt;

class Comment < ActiveRecord::Base
    attr_accessor :coment, :product_id, :user_id
    belongs_to :product
    belongs_to :user
end

评论控制器 - ＆gt;

class ProductsController < ApplicationController
    before_action :set_product, only: [:show, :edit, :update, :destroy]

    def index
        @products = Product.all
        @admin_user = User.find(3)
    end

    def show
        @products = Product.all
        @admin_user = User.find(3)
        @opsystems = Opsystem.all
        # users = User.where(name: 'Oscar')
        # users.new.name # => 'Oscar'
        @product = Product.find(params[:id])
        @product_os = @product.opsystem_id
        @opsystem = Opsystem.find(@product_os)
        @comment = Comment.new
        @comment.user = current_user

        # @operatingsystems = Opsystem.find_by(id: @pr )
    end

    def new
      @admin_user = User.find(3)
      @opsystems = Opsystem.all
        if current_user == @admin_user
            @product = Product.new
        else
             redirect_to root_url
        end

    end

     # GET /products/1/edit
  def edit
       @admin_user = User.find(3)
  end

  # POST /products
  # POST /products.json
  def create
    @product = Product.new(product_params)
    @opsystems = Opsystem.all

    respond_to do |format|
      if @product.save
        format.html { redirect_to @product, notice: 'Product was successfully created.' }
        format.json { render :show, status: :created, location: @product }
      else
        format.html { render :new }
        format.json { render json: @product.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /products/1
  # PATCH/PUT /products/1.json
  def update
    respond_to do |format|
      if @product.update(product_params)
        format.html { redirect_to @product, notice: 'Product was successfully updated.' }
        format.json { render :show, status: :ok, location: @product }
      else
        format.html { render :edit }
        format.json { render json: @product.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /products/1
  # DELETE /products/1.json
  def destroy
    @product.destroy
    respond_to do |format|
      format.html { redirect_to products_url, notice: 'Product was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_product
      @product = Product.find(params[:id])
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def product_params
      params.require(:product).permit(:name, :price, :image, :review, :processor, :ram_rom, :battery, :review, :display, :video, :camera, :opsystem_id )
    end
end

在class CommentsController < ApplicationController def create @product = Product.find(params[:product_id]) @comment = @product.comments.build(params[:comment]) @comment.user = current_user if @comment.save redirect_to @product, notice: "Comment was created." else render :new end end end ，来自产品，我已插入此表单：

products/show.html.erb

comments / _comments.html.erb包含 - ＆gt;

<div class="comment-wrapper">
          <ul class="comments">
              <%= render 'comments/comments' %>
              <li>
                <div class="comment-box-wrapper">
                  <%= form_for [@product, Comment.new], :remote => true do |f| %>
                    <div class="comment-textarea">
                      <%= f.text_area :coment %>
                    </div>
                    <div class="actions">
                      <%= f.submit "Comment", :class => "btn btn-small pull-right" %>
                    </div>
                  <% end %>
                </div>
              </li>
          </ul>
        </div>

我是这项技术的初学者，我担心在制作表格时可能会犯一些错误：

<% @product.comments.each do |comment| %>
 <li>
  <div class="comment-inner-wrapper">
    <div class="comment-controls">
     <% if comment.user == current_user %>          
       <%= link_to [@product, comment], :method => :delete, :confirm => "Are you sure?" do  %>
        <i class="icon-trash"></i>
       <% end %>
     <% end %>
   </div>
   <div class="comment-author-pic">
    <%= link_to comment.user do %>
      <%= image_tag comment.user.image.url(:thumb) %>
    <% end %>
   </div>
   <div class="comment-author">
    <%= link_to comment.user.username, comment.user %>
   </div>
   <div class="comment-content">
     <p><%= comment.content %></p>
   </div>
 </div>
</li>
<% end %>

Answer 1

您的节目视图中未定义product变量。相反，您可以使用您在控制器中定义的@project，并通过Rails传递给您的视图。

Answer 2

您的评论form_for来电有问题。这是它应该是什么样子：

<%= form_for [@product, Comment.new], url: new_comment_path(@product), :remote => true, html: { method: :post } do |f| %>

所做的更改：

• 将form_for target更改为url: new_comment_path(@product, Comment.new)
• 使用@product代替产品
• 添加html: { method: :post }选项

这更接近您的评论工作所需。有解释的变化：

:url选项允许您指定将表单发送到哪个url端点。您报告的jQuery错误表示该表单定位于/comments路径，当您确实希望它定位/comments/new路径时。使用路径助手获取新注释，可以将new_comment_path(@product)作为正确的端点。

使用@product模型对象，因为它从控制器传递到视图。这可能只是一个错字。

:html选项允许您为表单元素的HTML生成提供其他选项。在这种情况下，我们告诉Rails生成POST表单，因为Rails已经得出结论这是GET形式。这将允许表单提交POST到您的/comments/new控制器，因为它应该是。

另外一个注意事项：您在评论迁移，评论模型以及表单中使用了`：coment＆＃39;中的拼写错误。如果这是项目的早期阶段，那么您将要纠正这一点，因为稍后处理拼写错误的字段名称变得乏味。

更新

在products/show.html.erb Comment.new参数中移除form_for，如下所示：

<%= form_for @product, url: new_comment_path(@product), :remote => true, html: { method: :post } do |f| %>

创建新模型对象时，该对象不应包含在路径中。