无法将本地对象传递给Rails 3中的嵌套部分 [英] Cant pass local object to nested partial in Rails 3

问题描述

我希望有人能够阐明可能是一个简单的错误。我试图传递一个局部变量，文章，在部分_article.html.erb，另一部分嵌套在_article.html.erb。当部分代码在_article.html.erb中时，它工作正常。我尝试了很多变体（包括：locals），但似乎无法传递局部变量。

_article.html.erb

 <％if current_user.favorited？（article）％> 
<％= render：partial => 'unfavorite'，：object =>文章％> 
<％else％> 
<％= render：partial => 'favorite'，：object =>文章％> 
<％end％> 
  

_favorite.html.erb（最喜欢和不喜欢的都差不多，所以我已经

 <％= form_for current_user.favorites.find_by_article_id（article），：html => {：method => ：delete，：class => 'unfavorite_form'，}，：remote => true do | f | ％GT; 
< div><％= f.hidden_​​field：article_id％>< / div> 
<％= image_submit_tag（vote-favorite-on.png，：alt =>Favorite，：id =>favorites_button，：title =>从收藏夹中移除 > 
<％end％> 
  

错误讯息是：

<$ p $对于＃<＃< Class：0x491c2b0>：0x6727a58>的未定义局部变量或方法`article'

解决方案

rails文档 rendering 提及这样的对象的使用：

 <％= render：partial => customer，：object => @new_customer％> 
  

然后说：

 在客户部分内，客户变量将从父视图引用@ new_customer。 
  

这使得它看起来像：object变量被翻译成部分的名称。所以在你的情况下，在_favorite中，你必须使用喜欢的变量：

 <％= form_for current_user.favorites .find_by_article_id（favorite），：html => {：method => ：delete，：class => 'unfavorite_form'，}，：remote => true do | f | ％GT; 
  

就我个人而言，我更喜欢本地语法，因为这样您就可以明确表示：

 <％= render：partial => 'favorite'，：locals => {：article =>文章}％> 
  

Im hoping that someone can shed light on what is probably a simple mistake. Im trying to pass a local variable, article, which is in the partial _article.html.erb, to another partial nested within _article.html.erb. When the partial code is in _article.html.erb, it works fine.I've tried many variations (including :locals) but cant seem to pass the local variable.

_article.html.erb

 <% if current_user.favorited?(article) %>     
            <%= render :partial => 'unfavorite', :object => article  %>
 <% else %>
            <%= render :partial => 'favorite', :object => article %>
 <% end %>

_favorite.html.erb (both favorite and unfavorite are more or less the same, so I've only posted one)

 <%= form_for current_user.favorites.find_by_article_id(article), :html => { :method => :delete,  :class => 'unfavorite_form', }, :remote => true do |f| %> 
            <div><%= f.hidden_field :article_id %></div>
            <%= image_submit_tag("vote-favorite-on.png", :alt => "Favorite", :id => "favorites_button", :title => "Remove from favorites") %> 
 <% end %>

The error message is:

       undefined local variable or method `article' for #<#<Class:0x491c2b0>:0x6727a58>

解决方案

The rails docs for rendering mention the use of object like this:

<%= render :partial => "customer", :object => @new_customer %>

And say that:

Within the customer partial, the customer variable will refer to @new_customer from the parent view.

Which makes it seem like the :object variable is translated into the name of the partial. So in your case, in _favorite, you'd have to use the favorite variable:

 <%= form_for current_user.favorites.find_by_article_id(favorite), :html => { :method => :delete,  :class => 'unfavorite_form', }, :remote => true do |f| %> 

Personally I prefer the locals syntax, because then you can be explicit:

<%= render :partial => 'favorite', :locals => {:article => article} %>

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