当我从未显式调用它时，为什么我的实例变量会显示在视图中? [英] Why is my instance variable showing up on the view when I never called it explicitly?

问题描述

我正在 Rails 上编码，我已经从 rails g 模型 和 rails g 控制器 创建了一个应用程序 我已经成功创建了索引、显示、创建和新建在运行我的服务器并检查我完成的项目后，我遇到了这个问题，其中包含创建的优惠券数组的 @coupons 实例变量显示在视图索引页面中.我没有明确地调用它或它刚刚出现的任何东西.下面是我的 index.html.erb 和 CouponController 的代码.

views/index.html.erb

提供优惠券的商店列表</h1><div><%= @coupons.each do |coupon|％＞<h2><%=link_tocoupon.store,coupon_path(coupon)%></h2><%结束%>

<%= form_tag new_coupon_path, :method =>:做%><%= submit_tag "创建新优惠券" %><%结束%>

优惠券控制器

class CouponsController <应用控制器定义索引@coupons = Coupon.all结尾定义新结尾定义创建@coupon = Coupon.create(coupon_code: params[:coupon][:coupon_code], store: params[:coupon][:store])重定向到优惠券路径(@coupon)结尾高清秀@coupon = Coupon.find(params[:id])结尾结尾

请注意，我还删除了从 rails g controller 创建控制器时附带的 CSS

解决方案

<%= @coupons.each do |coupon|％＞

应该是

<% @coupons.each do |coupon|％＞

<%= 导致 @coupons 在视图上输出.

I'm coding on rails and I have created an application from the rails g model and rails g controller I have successfully created the index, show, create and new actions and after running my server and checking my finished project I have this problem where my instance variable of @coupons which contains an array of the created coupons, is showing up in the views index page. I didn't call it explicitly or anything it just showed up. Below is my code for my index.html.erb and CouponController.

views/index.html.erb

<h1> List of Stores with Coupons</h1>

<div>
<%= @coupons.each do |coupon| %>
  <h2><%= link_to coupon.store, coupon_path(coupon) %></h2>
<% end %>
</div>

<%= form_tag new_coupon_path, :method => :get do %>
  <%= submit_tag "Create New Coupon" %>
<% end %>

CouponController

class CouponsController < ApplicationController
  def index
    @coupons = Coupon.all
  end

  def new
  end

  def create
    @coupon = Coupon.create(coupon_code: params[:coupon][:coupon_code], store: params[:coupon][:store])

    redirect_to coupon_path(@coupon)
  end

  def show
    @coupon = Coupon.find(params[:id])
  end
end

Note that I also deleted the CSS that came when I created the controller from rails g controller

解决方案

<%= @coupons.each do |coupon| %>

should be

<% @coupons.each do |coupon| %>

The <%= causes @coupons to be output on the view.

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