Question

我是ruby的新手，但好像我有一些东西，我应该能够循环或by defining a :collection渲染它们。

在这里，每个花园可能分配了许多植物。我有一个部分，用植物卡和＃34;布局。这个视图正确地为每个花园渲染植物：

视图/花园/ show.html.haml

.row.plant-cards
  - @garden.plants.each do |plant|
    = render("shared/plants/card", {plant: plant, garden: @garden} )

视图/共享/植物/ _card.html.haml

.col-md-2
  .plant.thumbnail.text-center
    = button_to("+", add_to_garden_path(plant, @garden.id), {method: :post ,remote: true})
    = link_to(plant) do
      = image_tag("http://lorempixel.com/g/150/150/food/",:alt => plant.name)
      %h4.plant__title.caption= plant.name

我正在尝试通过ajax更新花园页面上的渲染植物。似乎我需要坚持渲染植物的输出＆＃34; card＆＃34;在.html()函数中使用.each()似乎很笨拙。看起来我应该能够将植物设置为:collection，就像我在下面尝试做的那样，但这不起作用：

视图/植物/ add_to_garden.js.erb （抱歉混合haml / erb - 我也在探索它）

<% flash.each do |key, message| %>
  $("#flash").html("<%= j render partial: "shared/flash_message", locals: {key: key, message: message } %>");
<% end %>
$(".plant-cards").html("<%= j render :partial => 'shared/plants/card', :collection => @garden.plants, :locals => {garden: @garden} %>");

当我对我的应用程序进行ajax调用时，我得到了这个运行时错误：

Started POST "/plants/2/add_to_garden/1" for ::1 at 2016-12-30 20:32:18 -0500
Processing by PlantsController#add_to_garden as JS
  Parameters: {"authenticity_token"=>"qJU/CEZudZFP9l6r1qdAlXJQrfY7fB0aZHmjRJh2yQO0IzxilP47mP2UjDDAmBNJouFtoAWkv/hJ2gCNR5BpgQ==", "id"=>"2", "garden_id"=>"1"}
  Garden Load (0.3ms)  SELECT  `gardens`.* FROM `gardens` WHERE `gardens`.`id` = 1 LIMIT 1
  Plant Load (0.2ms)  SELECT  `plants`.* FROM `plants` WHERE `plants`.`id` = 2 LIMIT 1
   (0.1ms)  BEGIN
  SQL (0.2ms)  INSERT INTO `gardens_plants` (`garden_id`, `plant_id`) VALUES (1, 2)
   (160.8ms)  COMMIT
   (0.2ms)  BEGIN
  User Load (0.3ms)  SELECT  `users`.* FROM `users` WHERE `users`.`id` = 1 LIMIT 1
   (0.1ms)  COMMIT
  Rendered shared/_flash_message.html.erb (0.3ms)
  Plant Load (0.5ms)  SELECT `plants`.* FROM `plants` INNER JOIN `gardens_plants` ON `plants`.`id` = `gardens_plants`.`plant_id` WHERE `gardens_plants`.`garden_id` = 1
  Rendered shared/plants/_card.html.haml (29.7ms)
  Rendered plants/add_to_garden.js.erb (42.3ms)
Completed 500 Internal Server Error in 238ms (ActiveRecord: 162.9ms)

NameError - undefined local variable or method `plant' for #<#<Class:0x007fdf9be0f6c8>:0x007fdf9bce6350>:
  app/views/shared/plants/_card.html.haml:3:in `_app_views_shared_plants__card_html_haml___4163891484537289381_70299132319600'
  ...

Answer 1

只是将@ Deep的答案放入一个问题，他建议

尝试使用如下：<%= j render partial: 'shared/plants/card', collection: @garden.plants, as: :plant, locals: { garden: @garden } %>

将@ garden.plants集合指定为:plant就可以了。

我可以在不使用.each（）的情况下渲染此集合吗？

1 个答案: