[英]Rails partials for collections not rendering
我正在关注一个教程,我们正在创建一个部分显示数据集合,但它没有渲染,我的rails服务器命令提示符显示数据库事务是成功的:
Started GET "/portfolios" for ::1 at 2019-05-09 11:52:03 -0500
Processing by PortfoliosController#index as HTML
Rendering portfolios/index.html.erb within layouts/portfolio
Portfolio Load (0.3ms) SELECT "portfolios".* FROM "portfolios"
↳ app/views/portfolios/index.html.erb:5
Rendered collection of portfolios/_portfolio_item.html.erb [11 times] (2.1ms)
Rendered portfolios/index.html.erb within layouts/portfolio (5.3ms)
Rendered shared/_nav.html.erb (0.8ms)
Completed 200 OK in 31ms (Views: 28.6ms | ActiveRecord: 0.3ms)
这是我的部分投资组合/ _portfolio_item.html.erb:
<p><%= link_to portfolio_item.title, portfolio_show_path(portfolio_item) %></p>
<p><%= portfolio_item.subtitle %></p>
<p><%= portfolio_item.body %></p>
<%= image_tag portfolio_item.thumb_image unless portfolio_item.thumb_image.nil? %>
<%= link_to "Edit", edit_portfolio_path(portfolio_item) %>
<%= link_to 'Delete Portfolio Item', portfolio_path(portfolio_item), method: :delete, data: { confirm: 'Are you sure?' } %>
我在投资组合/ index.html.erb下的索引视图:
<h1>Portfolio Items</h1>
<%= link_to "Create New Item", new_portfolio_url %>
<%= render partial: 'portfolio_item', collection: @portfolio_items %>
而我的portfolio_controller:
class PortfoliosController < ApplicationController
layout 'portfolio'
def index
@portfolio_items = Portfolio.all
end
def show
@portfolio_item = Portfolio.find(params[:id])
end
def new
@portfolio_item = Portfolio.new
3.times { @portfolio_item.technologies.build }
end
def create
@portfolio_item = Portfolio.new(portfolio_params)
respond_to do |format|
if @portfolio_item.save
format.html { redirect_to portfolios_path, notice: 'Your portfolio item is now live!' }
else
format.html { render :new }
end
end
end
def edit
@portfolio_item = Portfolio.find(params[:id])
end
def update
@portfolio_item = Portfolio.find(params[:id])
respond_to do |format|
if @portfolio_item.update(portfolio_params)
format.html { redirect_to portfolios_path, notice: 'The record was successfully updated.' }
else
format.html { render :edit }
end
end
end
def destroy
@portfolio_item = Portfolio.find(params[:id])
@portfolio_item.destroy
respond_to do |format|
format.html { redirect_to portfolios_url, notice: 'Portfolio was successfully destroyed.' }
end
end
private
def portfolio_params
params.require(:portfolio).permit(:title,
:subtitle,
:body,
:main_image,
:thumb_image,
technologies_attributes: [:name])
end
end
如果还有其他需要请提前告知我们并提前致谢!
我不熟悉收集语法bbut快速修复尝试:
## index.html.erb
<h1>Portfolio Items</h1>
<%= link_to "Create New Item", new_portfolio_url %>
<% @portfolio_items.each do |item| %>
<%= render partial: 'portfolio_item', portfolio_item: item %>
<% end %>
或者,如果您真的想要花哨,并且您的模型名为Portfolio,请将您的部分重命名为portfolios/_portfolio.html.erb
。 那会让你做到:
## index.html.erb
<h1>Portfolio Items</h1>
<%= link_to "Create New Item", new_portfolio_url %>
<% @portfolio_items.each do |item| %>
<%= render item %>
<% end %>
确保没有删除/隐藏您的视图的CSS或JavaScript。 还要确保您的数据库中实际上有一些组合的实例(行)。
<%= render partial: 'portfolio_item', collection: @portfolio_items %>
尽管您在partial中使用集合是正确的,但您可以尝试传递局部变量并查看它是否有效,因为集合使用取决于可能导致问题的文件/模型名称。
当您使用collection: @portfolio_items
您可以访问部分视图中的@portfolio_items
实例变量(在您的情况下为portfolios/_portfolio_item.html.erb
)。
您正在传递
@portfolio_items
但未在任何地方使用它,而是使用在部分视图中不可用的
portfolio_item
变量。
您需要迭代@portfolio_items
才能呈现您的项目。 如果需要将变量传递给部分使用的locals
变量。 更新您的portfolios/index.html.erb
,如下所示
<h1>Portfolio Items</h1>
<%= link_to "Create New Item", new_portfolio_url %>
<% @portfolio_items.each do |portfolio_item| %>
<%= render partial: 'portfolio_item', locals: { portfolio_item: portfolio_item } %>
<% end %>
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