从视图ROR呈现部分视图 [英] Render form partial from view ROR

问题描述

这是posts_index，render post.comments可以正常工作，但新的窗体

 <％@ posts.each do | post | ％GT; 
<％= link_to post.title，post％> 
<％= simple_format post.text％> 
<％=呈现post.comments.order（'created_at DESC'）。all％> 
<％= render：partial => '/ comments / form'，当地人：{post：post}％> 
  

我得到这个错误：未定义的方法'comments'for nil：NilClass

评论表：

 <％= form_for（[@ post，@ post.comments .build]）do | f | ％GT; 
<％= f.label：评论％>< br /> 
<％= f.text_area：body，：class => comment_text_box％> 
<％= f.submit％> 
<％end％> 
  

我明白我需要将post.comments传递给表单，但无法弄清楚。
$ b

Post_show可以与<％= rendercomments / form％>

$一起使用b
$ b

帖子和评论是 has_many 关系，帖子 has_many 评论。

感谢您的关注。

解决方案

您需要像下面这样将变量传递到您的部分：

 <％@ posts.each do | post | ％GT; 
<％= link_to post.title，post％> 
<％= simple_format post.text％> 
<％=呈现post.comments.order（'created_at DESC'）。all％> 
 <％=呈现部分：'/ comments / form'，当地人：{post：post}％> 
<％end％> 
  

并将您的表单部分更改为：

 <％= form_for（[post，post.comments.build]）do | f | ％GT; 
 //表单域
<％end％> 
  

Im trying to render a form from another controller in my view.

This is posts_index, and the render post.comments works fine, but the form for a new comment doesnt.

<% @posts.each do |post| %>
  <%= link_to post.title, post %>
    <%= simple_format post.text %>
      <%= render post.comments.order('created_at DESC').all %>
      <%= render :partial => '/comments/form', locals: {post: post} %>

I get this error: undefined method `comments' for nil:NilClass

The comments form:

<%= form_for([@post, @post.comments.build]) do |f| %>
  <%= f.label :Comment %><br />
  <%= f.text_area :body, :class => "comment_text_box" %>
  <%= f.submit %>
<% end %>

I understand I need to pass the post.comments to the form, but can't figure out how.

Post_show works with <%= render "comments/form" %>

Post and comments are a has_many relationship, posts has_many comments.

Thanks for looking.

解决方案

You need to pass variables into your partial like this:

<% @posts.each do |post| %>
  <%= link_to post.title, post %>
  <%= simple_format post.text %>
  <%= render post.comments.order('created_at DESC').all %>
  <%= render partial: '/comments/form', locals: {post: post} %>
<% end %>

and change your form partial to this:

<%= form_for([post, post.comments.build]) do |f| %>
  // form fields
<% end %>

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