ruby-on-rails - 将 Rails 表单部分嵌入另一个页面

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 Controller )。我正在尝试嵌入来自另一个 Controller 的部分表单。

这是代码(减去文本):

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

当我运行它时，出现错误“表单中的第一个参数不能包含 nil 或为空”。

我的查询表单看起来像一个基本的 Rails 表单:

<%= 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一个 View 嵌入到另一个 View 中？

更新/编辑:

路线如下:

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'

和查询 Controller :

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 Controller :

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 在它试图呈现表单时为 nil。您需要调用 new 操作来为要表示的表单创建 @enqiury。

您可以将路线更改为:

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

然后在您的查询 Controller 中:

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

编辑:

好的，现在我们结合 Friends Systems 在他的回答中给出的内容:

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

现在将表单中的任何 @enquiry 实例更改为 enquiry

这是因为您需要将变量传递给局部。