我的应用在本地运行没有任何问题。但是，一旦我将其推送到Heroku，我就无法列出帐户页面。
Heroku Logs
2015-05-06T18:10:57.822981+00:00 app[web.1]: Rendered layouts/_navbar.html.erb (81.2ms)
2015-05-06T18:10:57.823499+00:00 app[web.1]: Completed 200 OK in 84ms (Views: 3.4ms | ActiveRecord: 79.7ms)
2015-05-06T18:10:57.737903+00:00 app[web.1]: Started GET "/" for 173.210.102.18 at 2015-05-06 18:10:57 +0000
2015-05-06T18:10:57.740837+00:00 app[web.1]: Rendered pages/index.html.erb within layouts/application (0.2ms)
2015-05-06T18:10:57.741590+00:00 app[web.1]: Rendered layouts/_bootstrap.html.erb (0.0ms)
2015-05-06T18:10:57.823257+00:00 app[web.1]: Rendered layouts/_footer.html.erb (0.1ms)
2015-05-06T18:10:57.739651+00:00 app[web.1]: Processing by PagesController#index as HTML
2015-05-06T18:10:57.741030+00:00 app[web.1]: Rendered layouts/_bootstrap.html.erb (0.0ms)
2015-05-06T18:10:57.827130+00:00 heroku[router]: at=info method=GET path="/" host=intakelog.herokuapp.com request_id=cc5c6773-706f-4de2-9ddc-a435206f666c fwd="173.210.102.18" dyno=web.1 connect=1ms service=91ms status=304 bytes=844
2015-05-06T18:10:58.143345+00:00 heroku[router]: at=info method=GET path="/assets/application-3d36a00ee9ab0b0ddd1f3a157f3d5e63.css" host=intakelog.herokuapp.com request_id=cb43b329-b4bf-4864-9340-7598b60df22f fwd="173.210.102.18" dyno=web.1 connect=1ms service=4ms status=304 bytes=133
2015-05-06T18:10:58.525722+00:00 heroku[router]: at=info method=GET path="/favicon.ico" host=intakelog.herokuapp.com request_id=3e0c1c4a-463d-499f-b0a6-f608ebc2880e fwd="173.210.102.18" dyno=web.1 connect=1ms service=4ms status=304 bytes=133
2015-05-06T18:11:05.501469+00:00 app[web.1]: Completed 500 Internal Server Error in 47ms
2015-05-06T18:11:05.502887+00:00 app[web.1]:
2015-05-06T18:11:05.502891+00:00 app[web.1]: 19: <td><%= account.last_name %></td>
2015-05-06T18:11:05.502898+00:00 app[web.1]: 24: <td><%= link_to 'Edit', edit_account_path(account), class: "btn btn-link" %></td>
2015-05-06T18:11:05.502900+00:00 app[web.1]: 25: <td><%= link_to 'Destroy', account, method: :delete, data: { confirm: 'Are you sure?' }, class: "btn btn-link" %></td>
2015-05-06T18:11:05.502893+00:00 app[web.1]: 21: <td><%= account.phone %></td>
2015-05-06T18:11:05.502889+00:00 app[web.1]: ActionView::Template::Error (undefined method `program' for nil:NilClass):
2015-05-06T18:11:05.452737+00:00 app[web.1]: Started GET "/accounts" for 173.210.102.18 at 2015-05-06 18:11:05 +0000
2015-05-06T18:11:05.501366+00:00 app[web.1]: Rendered accounts/index.html.erb within layouts/application (45.7ms)
2015-05-06T18:11:05.502892+00:00 app[web.1]: 20: <td><%= account.address %></td>
2015-05-06T18:11:05.502902+00:00 app[web.1]: app/views/accounts/index.html.erb:22:in `block in _app_views_accounts_index_html_erb___1462060006632552356_70044541209800'
2015-05-06T18:11:05.502896+00:00 app[web.1]: 23: <td><%= link_to 'Show', account, class: "btn btn-link" %></td>
2015-05-06T18:11:05.502903+00:00 app[web.1]: app/views/accounts/index.html.erb:16:in `_app_views_accounts_index_html_erb___1462060006632552356_70044541209800'
2015-05-06T18:11:05.502905+00:00 app[web.1]: app/controllers/accounts_controller.rb:8:in `index'
2015-05-06T18:11:05.502906+00:00 app[web.1]:
2015-05-06T18:11:05.502907+00:00 app[web.1]:
2015-05-06T18:11:05.562895+00:00 app[web.1]: Started GET "/accounts" for 173.210.102.18 at 2015-05-06 18:11:05 +0000
2015-05-06T18:11:05.566966+00:00 app[web.1]: Rendered accounts/index.html.erb within layouts/application (1.8ms)
2015-05-06T18:11:05.567052+00:00 app[web.1]: Completed 500 Internal Server Error in 3ms
2015-05-06T18:11:05.568568+00:00 app[web.1]:
2015-05-06T18:11:05.568570+00:00 app[web.1]: ActionView::Template::Error (undefined method `program' for nil:NilClass):
2015-05-06T18:11:05.568572+00:00 app[web.1]: 19: <td><%= account.last_name %></td>
2015-05-06T18:11:05.568576+00:00 app[web.1]: 22: <td><%= account.program.program %></td>
2015-05-06T18:11:05.568577+00:00 app[web.1]: 23: <td><%= link_to 'Show', account, class: "btn btn-link" %></td>
2015-05-06T18:11:05.568579+00:00 app[web.1]: 24: <td><%= link_to 'Edit', edit_account_path(account), class: "btn btn-link" %></td>
2015-05-06T18:11:05.568581+00:00 app[web.1]: 25: <td><%= link_to 'Destroy', account, method: :delete, data: { confirm: 'Are you sure?' }, class: "btn btn-link" %></td>
2015-05-06T18:11:05.568582+00:00 app[web.1]: app/views/accounts/index.html.erb:22:in `block in _app_views_accounts_index_html_erb___1462060006632552356_70044541209800'
2015-05-06T18:11:05.568584+00:00 app[web.1]: app/views/accounts/index.html.erb:16:in `_app_views_accounts_index_html_erb___1462060006632552356_70044541209800'
2015-05-06T18:11:05.568585+00:00 app[web.1]: app/controllers/accounts_controller.rb:8:in `index'
2015-05-06T18:11:05.568587+00:00 app[web.1]:
2015-05-06T18:11:05.568573+00:00 app[web.1]: 20: <td><%= account.address %></td>
2015-05-06T18:11:05.568575+00:00 app[web.1]: 21: <td><%= account.phone %></td>
2015-05-06T18:11:05.502895+00:00 app[web.1]: 22: <td><%= account.program.program %></td>
2015-05-06T18:11:05.454378+00:00 app[web.1]: Processing by AccountsController#index as HTML
2015-05-06T18:11:05.564159+00:00 app[web.1]: Processing by AccountsController#index as HTML
2015-05-06T18:11:05.568588+00:00 app[web.1]:
2015-05-06T18:11:05.509049+00:00 heroku[router]: at=info method=GET path="/accounts" host=intakelog.herokuapp.com request_id=fb22278a-99e2-4e1f-946c-272015814ae7 fwd="173.210.102.18" dyno=web.1 connect=1ms service=56ms status=500 bytes=1754
2015-05-06T18:11:05.571223+00:00 heroku[router]: at=info method=GET path="/accounts" host=intakelog.herokuapp.com request_id=9cde7b41-7ca0-450a-8072-d3ac3ad41050 fwd="173.210.102.18" dyno=web.1 connect=1ms service=10ms status=500 bytes=1754
我想也许我的数据库不匹配所以我通过运行检查了heroku上的版本
heroku run rake db:version
Running `rake db:version` attached to terminal... up, run.9594
Current version: 20150506165923
它匹配我的架构文件。 ActiveRecord::Schema.define(version: 20150506165923)
我怀疑这是我的accounts_controller.rb文件。但是，由于它在我的本地环境中工作，我不确定它是什么。
accounts_controller.rb
class AccountsController < ApplicationController
before_action :set_account, only: [:show, :edit, :update, :destroy]
respond_to :html
def index
@account = Account.all
respond_with(@account)
end
def show
@notes = Note.where(account_id: @account.id) #Where a note belong to the current account
end
def new
@account = Account.new
respond_with(@account)
end
def edit
end
def create
@account = Account.new(account_params)
@account.save
respond_with(@account)
end
def update
@account.update(account_params)
respond_with(@account)
end
def destroy
@account.destroy
respond_with(@account)
end
private
def set_account
@account = Account.find(params[:id])
end
def account_params
params.require(:account).permit(:first_name, :last_name, :program_id, :address, :phone)
end
end
index.html.erb for Accounts
<h1>Listing accounts</h1>
<table class="table table-hover table-condensed">
<thead>
<tr>
<th>First name</th>
<th>Last name</th>
<th>Address</th>
<th>Phone</th>
<th>Program</th>
<th colspan="3"></th>
</tr>
</thead>
<tbody>
<% @account.each do |account| %>
<tr>
<td><%= account.first_name %></td>
<td><%= account.last_name %></td>
<td><%= account.address %></td>
<td><%= account.phone %></td>
<td><%= account.program.program %></td>
<td><%= link_to 'Show', account, class: "btn btn-link" %></td>
<td><%= link_to 'Edit', edit_account_path(account), class: "btn btn-link" %></td>
<td><%= link_to 'Destroy', account, method: :delete, data: { confirm: 'Are you sure?' }, class: "btn btn-link" %></td>
</tr>
<% end %>
</tbody>
</table>
<br>
<%= link_to 'New Account', new_account_path %>
Rake Routes
rake routes
Prefix Verb URI Pattern Controller#Action
new_user_session GET /users/sign_in(.:format) devise/sessions#new
user_session POST /users/sign_in(.:format) devise/sessions#create
destroy_user_session DELETE /users/sign_out(.:format) devise/sessions#destroy
user_password POST /users/password(.:format) devise/passwords#create
new_user_password GET /users/password/new(.:format) devise/passwords#new
edit_user_password GET /users/password/edit(.:format) devise/passwords#edit
PATCH /users/password(.:format) devise/passwords#update
PUT /users/password(.:format) devise/passwords#update
cancel_user_registration GET /users/cancel(.:format) devise/registrations#cancel
user_registration POST /users(.:format) devise/registrations#create
new_user_registration GET /users/sign_up(.:format) devise/registrations#new
edit_user_registration GET /users/edit(.:format) devise/registrations#edit
PATCH /users(.:format) devise/registrations#update
PUT /users(.:format) devise/registrations#update
DELETE /users(.:format) devise/registrations#destroy
account_notes POST /accounts/:account_id/notes(.:format) notes#create
new_account_note GET /accounts/:account_id/notes/new(.:format) notes#new
edit_account_note GET /accounts/:account_id/notes/:id/edit(.:format) notes#edit
account_note PATCH /accounts/:account_id/notes/:id(.:format) notes#update
PUT /accounts/:account_id/notes/:id(.:format) notes#update
DELETE /accounts/:account_id/notes/:id(.:format) notes#destroy
accounts GET /accounts(.:format) accounts#index
POST /accounts(.:format) accounts#create
new_account GET /accounts/new(.:format) accounts#new
edit_account GET /accounts/:id/edit(.:format) accounts#edit
account GET /accounts/:id(.:format) accounts#show
PATCH /accounts/:id(.:format) accounts#update
PUT /accounts/:id(.:format) accounts#update
DELETE /accounts/:id(.:format) accounts#destroy
programs GET /programs(.:format) programs#index
POST /programs(.:format) programs#create
new_program GET /programs/new(.:format) programs#new
edit_program GET /programs/:id/edit(.:format) programs#edit
program GET /programs/:id(.:format) programs#show
PATCH /programs/:id(.:format) programs#update
PUT /programs/:id(.:format) programs#update
DELETE /programs/:id(.:format) programs#destroy
pages_index GET /pages/index(.:format) pages#index
root GET / pages#index
答案 0 :(得分：1)
试试这个：
而不是：
<td><%= account.program.program %></td>
尝试：
<td><%= account.program ? account.program.program : "" %></td>
在尝试访问其任何属性之前，您需要验证account.program是否存在，以下是不太简洁的代码：
<td>
<%if account.program%>
<%=account.program.program%>
<%else%>
Program doesn't exist
<%end%>
</td>
答案 1 :(得分：0)
您的帐户控制器中似乎没有定义任何名为program的方法。
<td><%= account.program.program %></td>
这似乎抛出了这个错误。尝试注释掉此代码并重新部署。