紅寶石多態性協會的Heroku

Question

下面的問題類似的問題在當地，但沒有工作，但需要不同的解決方案

ActionView::Template::Error (undefined method...) Works locally, but not on Heroku

我多態關聯地址>帳號在本地工作，但是當我把它上傳到的Heroku

Rendered addresses/show.html.erb within layouts/application (101.1ms) 
2016-01-09T03:04:14.947013+00:00 app[web.1]: 
2016-01-09T03:04:14.947015+00:00 app[web.1]: ActionView::Template::Error (undefined method `addressable' for nil:NilClass): 
2016-01-09T03:04:14.947016+00:00 app[web.1]:  1: <div id="central"> 
2016-01-09T03:04:14.947017+00:00 app[web.1]:  2:  <h1><%= @addresses.addressable.try(:name) %></h1> 
2016-01-09T03:04:14.947018+00:00 app[web.1]:  3:  <h5><%= @addresses.addressable_type %> Address </h5> 
2016-01-09T03:04:14.947018+00:00 app[web.1]:  4:  <div id="limiter"> 
2016-01-09T03:04:14.947020+00:00 app[web.1]: app/views/addresses/show.html.erb:2:in `_app_views_addresses_show_html_erb__1277570398496108107_69968312940660' 
2016-01-09T03:04:14.947019+00:00 app[web.1]:  5:  <table class="tbig" align="center" style="width:100%;"> 
2016-01-09T03:04:14.947021+00:00 app[web.1]: 
2016-01-09T03:04:14.947021+00:00 app[web.1]: 

的模型設置是這樣的：：

渲染視圖時，我得到了以下錯誤

數據庫表等：

class CreateTableAddresses < ActiveRecord::Migration 
    def change 
    create_table :addresses do |t| 
    t.string :no  
    t.string :street 
    t.string :suburb 
    t.string :code 
    t.text :details 
    t.belongs_to :city 
    t.references :addressable, polymorphic: true, index: true 
    t.timestamps null: false  
    end 
    end 
end 

class CreateTableAccounts < ActiveRecord::Migration 
    def change 
    create_table :accounts do |t| 
    t.text :name 
    t.string :no 
    t.string :site 
    t.string :email 
    t.string :phone1 
    t.string :phone2 
    t.text :details 
    t.timestamps null: false 
    end 
    end 
end 

的地址視圖從show_accounts

<div id="central"> 
    <h1><%= @addresses.addressable.try(:name) %></h1> 
    <h5><%= @addresses.addressable_type %> Address </h5> 
    <div id="limiter"> 
    <table class="tbig" align="center" style="width:100%;"> 
    <col width="50%"> 
    <col width="50%"> 
    <tr><th colspan="2" class="bottom">Address Details</th></tr>  
     <tr class="odd"> 
     <td class="left">Address System ID: </td> 
     <td class="right output"> <%= @addresses.id %> </td> 
    </tr> 
     <tr class="even"> 
     <td class="left">Number: </td> 
     <td class="right output"> <%= @addresses.no %> </td> 
    </tr> 
     <tr class="odd"> 
     <td class="left">Street: </td> 
     <td class="right output"><%= @addresses.street %></td> 
    </tr> 
     <tr class="even"> 
     <td class="left">Suburb:</td> 
     <td class="right output"><%= @addresses.suburb %></td> 
    </tr> 
     <tr class="odd"> 
     <td class="left">Post Code: </td> 
     <td class="right output"><%= @addresses.code %></td> 
    </tr> 
     <tr class="even"> 
     <td colspan="2" class="bottom"> <%= @addresses.details %></td>  </tr> 
     <tr><th colspan="2" class="bottom"></th></tr> 
    </table> 
<div id="menu"> 
<ul class="menu"> 
    <!-- Access Check - Edit Address --> 
    <% if Accessrule.find_by(role_id: current_user.role_id, workspace:2).try(:canupdate?) %> 
    <li> <%= link_to (image_tag("address_edit.png", :width => "70%")), edit_address_path %> 
    <br /><%= link_to "Edit Address", edit_address_path %></li> 
    <% end %> 

    <!-- back Accounts --> 
    <li> <%= link_to (image_tag("address_back.png", :width => "70%")), @addresses.addressable %> 
    <br /><%= link_to "Back", @addresses.addressable %></li> 
    </ul> 
</div> 
</div> 

和地址控制器到來時被接收到錯誤：

類AddressesController < ApplicationController的 before_action ：logged_in_user

def address_params 
    params.require(:address).permit(:id, :no, :street, :suburb, :code, :details, :city_id, :addressable_type, :addressable_id) 
end 


def new 
    if Accessrule.find_by(role_id: current_user.role_id, workspace:3).try(:canwrite?) 
    @logs = Log.create(user_id: current_user.id , role_id: current_user.role_id, workspace_id:3, action:"New") 
     @addresses = Address.new(:addressable_type => params[:addressable_type],:addressable_id => params[:addressable_id]) 
    else 
    @logs = Log.create(user_id: current_user.id , role_id: current_user.role_id, workspace_id:3, action:"New !Access Denied! ") 
    flash[:notice] = "You don't have access to create Addresses." 
    redirect_to :back 
    end 
end 

def create 
    if Accessrule.find_by(role_id: current_user.role_id, workspace:3).try(:canwrite?) 
    @logs = Log.create(user_id: current_user.id , role_id: current_user.role_id, workspace_id:3, action:"Create", details: address_params) 
     @address = Address.new(address_params) 
     if @address.save 
     flash[:notice] = 'Address Saved' 
     redirect_to @address.addressable 
     else 
     render "new" 
     end 
    else 
    @logs = Log.create(user_id: current_user.id , role_id: current_user.role_id, workspace_id:3, action:"Create !Access Denied! ") 
    flash[:notice] = "You don't have access to create Addresses." 
    redirect_to :back 
    end 
end 


def edit 
    if Accessrule.find_by(role_id: current_user.role_id, workspace:3).try(:canupdate?) 
    @logs = Log.create(user_id: current_user.id , role_id: current_user.role_id, workspace_id:3, action:"Edit", details: params[:id]) 
     @addresses = Address.find(params[:id]) 
    else 
    @logs = Log.create(user_id: current_user.id , role_id: current_user.role_id, workspace_id:3, action:"Edit !Access Denied! ", details: params[:id]) 
    flash[:notice] = "You don't have access to edit Addresses." 
    redirect_to :back 
    end 
end 

def update 
    if Accessrule.find_by(role_id: current_user.role_id, workspace:3).try(:canupdate?) 
    @logs = Log.create(user_id: current_user.id , role_id: current_user.role_id, workspace_id:3, action:"Update", details: address_params) 
     @accounts = Account.all 
     @addresses = Address.find(params[:id]) 
     if @addresses.update_attributes(address_params) 
     redirect_to @address.addressable 
      flash[:notice] = 'Account Updated' 
     else 
     render "edit" 
     flash[:error] 
     end 
    else 
    flash[:notice] = "You don't have access to edit Addresss." 
    redirect_to back 
    end 
end 

def show 
    if Accessrule.find_by(role_id: current_user.role_id, workspace:3).try(:canread?) 
    @logs = Log.create(user_id: current_user.id , role_id: current_user.role_id, workspace_id:3, action:"View", details: params[:id]) 
     @addresses = Address.find(params[:id]) 
    else 
    @logs = Log.create(user_id: current_user.id , role_id: current_user.role_id, workspace_id:3, action:"View !Access Denied! ", details: params[:id]) 
    flash[:notice] = "You don't have access to view Addresss." 
    redirect_to back 
    end 
end 

def destroy 
    if Accessrule.find_by(role_id: current_user.role_id, workspace:3).try(:candelete?) 
     @addresses = Address.find(params[:id]) 
     @logs = Log.create(user_id: current_user.id , role_id: current_user.role_id, workspace_id:3, action:"Delete", details: params[:id]) 
     @addresses.destroy 
     redirect_to :back 
     flash[:notice] = 'Address Deleted' 
    else 
    flash[:notice] = "You don't have access to delete Addresss." 
    redirect_to :back 
     end 
end 


    # Before Filters 
    # Confirms if User is logged-in 
    def logged_in_user 
    unless logged_in? 
    flash[:danger] = "Please log in." 
    redirect_to root_path 
    end 
    end 
end 

Answer 1

您的關聯在這裏與這個錯誤完全沒有關係。始終查看整個錯誤消息，尤其是在for nil:NilClass。問題是，你的@addresses給nil，尋找不存在於數據庫中記錄時可能發生：從除

@addresses = Address.find(params[:id]) # Can return nil 

- 你的變量名是相當混亂。當期望單個對象（不是集合）時，請使用單數address，複數addresses表示它是一個關係對象。