Question

我正在构建一个带有联系我们页面的rails 4.2.0应用程序（此页面确实有一个半空控制器）。我试图从另一个控制器嵌入一个表单部分。

这是代码（减去文字）：

<% if user_signed_in? %>
 <% render 'enquiries/form' %>
<% end %>

当我运行这个时，我收到错误'表格中的第一个参数不能包含nil或为空'。

我的查询表格看起来像一个基本的轨道形式：

<%= form_for @enquiry do |f| %>
  <% if @enquiry.errors.any? %>
   <div id="error_explanation">
    <h2><%= pluralize(@enquiry.errors.count, "error") %> prohibited this enquiry from being saved:</h2>
    <ul>
    <% @enquiry.errors.full_messages.each do |message| %>
      <li><%= message %></li>
    <% end %>
    </ul>
   </div>
<% end %>

 <div class="field">
   <%= f.label :subject, "Subject:" %><br>
   <%= f.text_field :subject %>
 </div>
 <div class="field">
   <%= f.label :e_description, "Description:" %><br>
   <%= f.text_area :e_description %>
 </div>
 <div class="actions">
   <%= f.submit %>
 </div>

错误的可能原因是什么？或者是否有更好的方法将视图嵌入到另一个视图中？

更新/编辑：

这是路线：

devise_for :users

resources :rooms do
    resources :viewings
end

resources :rmcats
resources :extras
resources :extracats
resources :enquiries

root :to => redirect('/pages/home')

get 'pages/home'
get 'pages/contactus'

询问管制员：

class EnquiriesController < ApplicationController
  before_action :set_enquiry, only: [:show, :edit, :update, :destroy]

 # GET /enquiries
  def index
   @enquiries = Enquiry.all
  end

 # GET /enquiries/1
  def show
  end

 # GET /enquiries/new
  def new
   @enquiry = Enquiry.new
  end

 # GET /enquiries/1/edit
  def edit
  end

 # POST /enquiries
  def create
   @enquiry = Enquiry.new(enquiry_params)

   if @enquiry.save
    redirect_to @enquiry, notice: 'Enquiry was successfully created.'
   else
    render :new
   end
 end

 # PATCH/PUT /enquiries/1
  def update
   if @enquiry.update(enquiry_params)
    redirect_to @enquiry, notice: 'Enquiry was successfully updated.'
   else
    render :edit
  end
end

 # DELETE /enquiries/1
  def destroy
   @enquiry.destroy
   redirect_to enquiries_url, notice: 'Enquiry was successfully destroyed.'
  end

  private
   # Use callbacks to share common setup or constraints between actions.
   def set_enquiry
    @enquiry = Enquiry.find(params[:id])
   end

   # Only allow a trusted parameter "white list" through.
   def enquiry_params
    params.require(:enquiry).permit(:subject, :e_description)
   end
end

这是页面控制器：

class PagesController < ApplicationController
  around_filter :resource_not_found
  # def home
  # end
  private
  # If resource not found redirect to root and flash error.
  # => For pages this will rarely be needed as it should 404.
  def resource_not_found
     yield
  rescue ActiveRecord::RecordNotFound
    redirect_to root_url, :notice => "Page not found."
  end
end

编辑：

日志：

Started GET "/pages/contactus" for ::1 at 2015-03-21 01:05:25 +0000
Processing by EnquiriesController#new as HTML
  [1m[35mUser Load (0.0ms)[0m  SELECT  "users".* FROM "users" WHERE "users"."id" = ?  ORDER BY "users"."id" ASC LIMIT 1  [["id", 1]]
  Rendered enquiries/_form.html.erb (0.0ms)
  Rendered pages/contactus.html.erb within layouts/application  (0.0ms)
Completed 200 OK in 235ms (Views: 234.6ms | ActiveRecord: 0.0ms)

Answer 1

它告诉您@enquiry在尝试呈现表单时为零。您需要调用new操作为表单创建@enqiury。

您可以将路线更改为：

get 'pages/contactus' => 'enquiries#new'

然后在您的查询控制器中：

def new
  @enquiry = Enquiry.new
  render 'pages/contactus'
end

编辑：

好的，现在我们将Friends Systems的答案结合起来：

<% if user_signed_in? %>
  <%= render 'enquiries/form' enquiry: @enquiry %>
<% end %>

现在将表单中@enquiry的任何实例更改为enquiry

这是因为您需要将变量传递给partial。

Answer 2

问题是，你的@enquiry变量没有在渲染部分的上下文中定义。它不是由被调用的控制器动作定义的，你应该通过调用

来创建一个查询实例

@enquiry = Enquiry.new

在你的行动中。

另外

在其他地方使用它我会将@enquiry实例变量作为语言环境变量传递给部分

<% render 'enquiries/form', :enquiry => @enquiry %>

您的表单方法应如下所示：

<%= form_for enquiry do |f| %>
  ...
<% end %>

当然应该替换所有实例变量。只需删除＆＃39; @＆＃39;

编辑：根据您在上面发布的控制器设置，最好的方法是使用

之类的东西

@enquiry ||= Enquiry.new

如果@enquiry为nil，则在您的表单中使用shure创建一个新实例。

将Rails表单部分嵌入到另一个页面中

2 个答案: