Rails 3 Render =>参数新增 [英] Rails 3 Render => New with Parameter

问题描述

我读过: 轨道:使用render:action?传递参数，但我仍然有问题.

我在新页面上的URL是: http://localhost:3000/submit?category_id = 2 .第一次提交表单没有任何问题，但是如果创建失败并且控制器呈现新页面，我会收到一个错误，因为没有传递参数，所以没有id的类别找不到.

这是new.html.erb和new/create控制器的简短版本

def new
    ...
    @category = params[:category_id]
    @title = "Submit a review"
  end

  def create
    ....
    if @review.save
      flash[:success] = "New a Created"
      redirect_to user_path(@user)
    else
      @title = "New Review"
      render :action => 'new', :category_id => @category     
    end
  end

下面的第1行给我错误.

<h1>Blah, blah, blah<%= "best #{Category.find(@category).name}" %></h1>
<br />
<%= form_for(...) do |f| %>
  <%= render 'shared/error_messages', :object => f.object %>
  <tr>
    <td> <%= select_tag(... %></td>
    <td><%= collection_select(...) %><br /> %></td>
    <td><%= f.text_field ... %></td>
  </tr>
</table>
        <%= f.hidden_field :category_id, :value=>@category %>
<div class="actions">
      <%= f.submit "Add" %>
 </div>
<% end %>

感谢您的帮助.我已经转了好几个小时.

解决方案

我认为您的'create'方法的else子句将需要大致反映您的'new'方法，这意味着再次从params填充@category >哈希.

因此，首先请确保您的隐藏字段已填充，然后在提交表单时检查params的内容. category_id应该在那儿，如果保存失败，您需要像在"new"中一样再次抓住它.

I'v read: Rails: Pass parameters with render :action? ,but I'm still having problems.

My URL for the new page is: http://localhost:3000/submit?category_id=2. Submitting the form the first time works without any problems, but if the creation fails and the controller renders a new page I get an error can't find category without id because the parameter is not being passed.

Here's a short version of the new.html.erb and new/create controllers

def new
    ...
    @category = params[:category_id]
    @title = "Submit a review"
  end

  def create
    ....
    if @review.save
      flash[:success] = "New a Created"
      redirect_to user_path(@user)
    else
      @title = "New Review"
      render :action => 'new', :category_id => @category     
    end
  end

Line 1 below is giving me the error.

<h1>Blah, blah, blah<%= "best #{Category.find(@category).name}" %></h1>
<br />
<%= form_for(...) do |f| %>
  <%= render 'shared/error_messages', :object => f.object %>
  <tr>
    <td> <%= select_tag(... %></td>
    <td><%= collection_select(...) %><br /> %></td>
    <td><%= f.text_field ... %></td>
  </tr>
</table>
        <%= f.hidden_field :category_id, :value=>@category %>
<div class="actions">
      <%= f.submit "Add" %>
 </div>
<% end %>

Any help is appreciated. I've been going in circles for hours.

解决方案

I think the else clause of your 'create' method will need to roughly mirror your 'new' method, which means populating @category again from your params hash.

So first make sure your hidden field is populated, then check the contents of params when the form is submitted. category_id should be there and you'll need to grab it again as you did in 'new', if the save fails.

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