轨道如何渲染来自另一个控制器的页面

Question

Hi I am trying to render a view from one page to another pager that

I want render companyratings/show in pages/companies_list. So I have used the following code to do that

in companies_list.html.erb

<%= render :partial => 'companyratings/show' %>

but it showing an error in my companyrating/show page NoMethodError in Pages#companies_list

at undefined method `each' for nil:NilClass

this my content in my companyratings/show

<title>Shared Todo App </title>
<h1>Shared Todo App</h1>
<p>All your todos here</p>
<table border="3">                         
  <tr>                          
    <th>Name</th>
    <th>place</th>
    <th>Rating</th>
    <th>Rank</th>
  </tr>
<% @companies.each do |companies| %>     
  <tr>
    <td>  <%= companies.name%> </td>  
    <td><%= companies.place%></td> 
    <td><%= companies.rate%>%</td> 
    <td><%= companies.rank%></td>  
  </tr>
<% end %>                        
</table> 

this is my companies_list file

<% if signed_in? %>
  <div class="row">
    <aside class="span4">
     <section>
                   <%= render 'shared/user_info' %>
 <%= render :partial => 'companyratings/show' %>

      </section>

  </div>  
<% else %>
<%end%>

Here is the controller for companyratings

class CompanyratingsController < ApplicationController
    before_action :signed_in_user, only: [:create, :destroy]
    before_action :correct_user,   only: :destroy


def index
     @companies = Companyrating.all
     @companyrating = Companyrating.new

  end

def show
    @companyrating = Companyrating.new
    @companies = Companyrating.all
end



def create
  @companies = Companyrating.new(params[:companyrating])
  if @companies.save
    flash[:success] = "Welcome to My Space!"
    redirect_to :action => 'index'
  else
    flash[:error] = "Can't create companyrating."
    render 'index'
  end
end


 private
 def new_company_rating
      params.require(:company_rating).permit(:name, :place, :rate, :rank, :user_id)
 end
def correct_user
      @companies = current_user.companies.find_by(id: params[:id])
      redirect_to root_url if @companyrating.nil?
    end


end

this is my controller code for pages controller

class PagesController < ApplicationController
  def companies_list
    @title = "companies_list"
    if signed_in?
       @companies_mines  = current_user.companies_mines.build



    end
  end


end

So can any one help how to do this

Answer 1

It's caused by the fact, that you're probably not setting @companies variable in method responsible for rendering companies_list file.

We can't tell you anything more until you provide us controller code.

Answer 2

You will need to have @companies on hand and pass it along with locals . Then reference the local variable.

http://guides.rubyonrails.org/layouts_and_rendering.html#using-partials

Look at 3.4.6 local variables

Answer 3

your doing right way but for solved to that error you have to do some following changes.

as you have the def companies_list

in your page controller, here there is no instance for @companies as you have used in your partial('companyratings/show').

The error occurred because you are not sending any @companies as locales and you have used looping thought it.

so add @companies instance in def companies_list and send as locales into partial like this

<%= render :partial => 'companyratings/show', locals=>{:companies => @companies } %>

and use companies instance instead of @companies.