Question

我正在做michael hartl关于ruby on rails的教程，一切都在本地工作正常但在应用程序部署时不在heroku上..这个问题出现在本书第7章之前：http://ruby.railstutorial.org/ruby-on-rails-tutorial-book#top

您是否需要调试此问题的详细信息？请让我知道.....

这是heroku日志：

$ 2012-07-18T06:10:26+00:00 app[web.1]:     6:         <ul class="nav pull-right">

2012-07-18T06:10:26+00:00 app[web.1]: ActionView::Template::Error (undefined met
hod `find_by_remember_token' for #<Class:0x00000004960740>):
2012-07-18T06:10:26+00:00 app[web.1]:     7:           <li><%= link_to "Home", r
oot_path %></li>
2012-07-18T06:10:26+00:00 app[web.1]:     8:           <li><%= link_to "Help", h
elp_path %></li>
2012-07-18T06:10:26+00:00 app[web.1]:     9:           <% if signed_in? %>
2012-07-18T06:10:26+00:00 app[web.1]:     10:             <li><%= link_to "Users
", users_path %></li>
2012-07-18T06:10:26+00:00 app[web.1]:     11:             <li id="fat-menu" clas
s="dropdown">
2012-07-18T06:10:26+00:00 app[web.1]:     12:               <a href="#" class="d
ropdown-toggle" data-toggle="dropdown">
2012-07-18T06:10:26+00:00 app[web.1]:   app/helpers/sessions_helper.rb:10:in `cu
rrent_user'
2012-07-18T06:10:26+00:00 app[web.1]:   app/helpers/sessions_helper.rb:23:in `si
gned_in?'
2012-07-18T06:10:26+00:00 app[web.1]:   app/views/layouts/application.html.erb:1
1:in `_app_views_layouts_application_html_erb___2533055855927805914_43132200'
2012-07-18T06:10:26+00:00 app[web.1]:   app/views/layouts/_header.html.erb:9:in
`_app_views_layouts__header_html_erb__2547305690965663969_41244280'
2012-07-18T06:10:26+00:00 app[web.1]:
2012-07-18T06:10:26+00:00 app[web.1]:
2012-07-18T06:10:26+00:00 heroku[router]: GET whizcollab.herokuapp.com/ dyno=web
.1 queue=0 wait=0ms service=345ms status=500 bytes=643
2012-07-18T06:10:34+00:00 app[web.1]:
2012-07-18T06:10:34+00:00 app[web.1]: Started GET "/" for 115.87.214.246 at 2012
-07-18 06:10:34 +0000
2012-07-18T06:10:34+00:00 app[web.1]:
2012-07-18T06:10:34+00:00 app[web.1]: Processing by StaticPagesController#home a
s HTML
2012-07-18T06:10:34+00:00 app[web.1]:   Rendered static_pages/home.html.erb with
in layouts/application (0.6ms)
2012-07-18T06:10:34+00:00 app[web.1]:   Rendered layouts/_shim.html.erb (0.0ms)
2012-07-18T06:10:34+00:00 app[web.1]:   Rendered layouts/_header.html.erb (1.2ms
)
2012-07-18T06:10:34+00:00 app[web.1]: Completed 500 Internal Server Error in 4ms

2012-07-18T06:10:34+00:00 app[web.1]: ActionView::Template::Error (undefined met
hod `find_by_remember_token' for #<Class:0x00000004960740>):
2012-07-18T06:10:34+00:00 app[web.1]:
2012-07-18T06:10:34+00:00 app[web.1]:     8:           <li><%= link_to "Help", h
elp_path %></li>
2012-07-18T06:10:34+00:00 app[web.1]:     9:           <% if signed_in? %>
2012-07-18T06:10:34+00:00 app[web.1]:     6:         <ul class="nav pull-right">

2012-07-18T06:10:34+00:00 app[web.1]:     10:             <li><%= link_to "Users
", users_path %></li>
2012-07-18T06:10:34+00:00 app[web.1]:     7:           <li><%= link_to "Home", r
oot_path %></li>
2012-07-18T06:10:34+00:00 app[web.1]:     11:             <li id="fat-menu" clas
s="dropdown">
2012-07-18T06:10:34+00:00 app[web.1]:     12:               <a href="#" class="d
ropdown-toggle" data-toggle="dropdown">
2012-07-18T06:10:34+00:00 app[web.1]:   app/helpers/sessions_helper.rb:10:in `cu
rrent_user'
2012-07-18T06:10:34+00:00 app[web.1]:   app/views/layouts/_header.html.erb:9:in
`_app_views_layouts__header_html_erb__2547305690965663969_41244280'
2012-07-18T06:10:34+00:00 app[web.1]:   app/helpers/sessions_helper.rb:23:in `si
gned_in?'
2012-07-18T06:10:34+00:00 app[web.1]:   app/views/layouts/application.html.erb:1
1:in `_app_views_layouts_application_html_erb___2533055855927805914_43132200'
2012-07-18T06:10:34+00:00 app[web.1]:
2012-07-18T06:10:34+00:00 app[web.1]:
2012-07-18T06:10:34+00:00 heroku[router]: GET whizcollab.herokuapp.com/ dyno=web
.1 queue=0 wait=0ms service=22ms status=500 bytes=643
2012-07-18T06:12:03+00:00 app[web.1]:
2012-07-18T06:12:03+00:00 app[web.1]:
2012-07-18T06:12:03+00:00 app[web.1]: Started GET "/" for 115.87.214.246 at 2012
-07-18 06:12:03 +0000
2012-07-18T06:12:03+00:00 app[web.1]: Processing by StaticPagesController#home a
s HTML
2012-07-18T06:12:03+00:00 app[web.1]:   Rendered static_pages/home.html.erb with
in layouts/application (0.7ms)
2012-07-18T06:12:03+00:00 app[web.1]:   Rendered layouts/_shim.html.erb (0.0ms)
2012-07-18T06:12:03+00:00 app[web.1]: Completed 500 Internal Server Error in 6ms

2012-07-18T06:12:03+00:00 app[web.1]:   Rendered layouts/_header.html.erb (2.3ms
)
2012-07-18T06:12:03+00:00 app[web.1]: ActionView::Template::Error (undefined met
hod `find_by_remember_token' for #<Class:0x00000004960740>):
2012-07-18T06:12:03+00:00 app[web.1]:
2012-07-18T06:12:03+00:00 app[web.1]:     6:         <ul class="nav pull-right">

2012-07-18T06:12:03+00:00 app[web.1]:     7:           <li><%= link_to "Home", r
oot_path %></li>
2012-07-18T06:12:03+00:00 app[web.1]:     8:           <li><%= link_to "Help", h
elp_path %></li>
2012-07-18T06:12:03+00:00 app[web.1]:     9:           <% if signed_in? %>
2012-07-18T06:12:03+00:00 app[web.1]:     11:             <li id="fat-menu" clas
s="dropdown">
2012-07-18T06:12:03+00:00 app[web.1]:     10:             <li><%= link_to "Users
", users_path %></li>
2012-07-18T06:12:03+00:00 app[web.1]:     12:               <a href="#" class="d
ropdown-toggle" data-toggle="dropdown">
2012-07-18T06:12:03+00:00 app[web.1]:   app/helpers/sessions_helper.rb:10:in `cu
rrent_user'
2012-07-18T06:12:03+00:00 app[web.1]:   app/helpers/sessions_helper.rb:23:in `si
gned_in?'
2012-07-18T06:12:03+00:00 app[web.1]:   app/views/layouts/_header.html.erb:9:in
`_app_views_layouts__header_html_erb__2547305690965663969_41244280'
2012-07-18T06:12:03+00:00 app[web.1]:   app/views/layouts/application.html.erb:1
1:in `_app_views_layouts_application_html_erb___2533055855927805914_43132200'
2012-07-18T06:12:03+00:00 app[web.1]:
2012-07-18T06:12:03+00:00 app[web.1]:
2012-07-18T06:12:03+00:00 heroku[router]: GET whizcollab.herokuapp.com/ dyno=web
.1 queue=0 wait=0ms service=17ms status=500 bytes=643
2012-07-18T06:13:31+00:00 app[web.1]:
2012-07-18T06:13:31+00:00 app[web.1]:
2012-07-18T06:13:31+00:00 app[web.1]: Started GET "/" for 115.87.214.246 at 2012
-07-18 06:13:31 +0000
2012-07-18T06:13:31+00:00 app[web.1]: Processing by StaticPagesController#home a
s HTML
2012-07-18T06:13:31+00:00 app[web.1]:   Rendered static_pages/home.html.erb with
in layouts/application (0.4ms)
2012-07-18T06:13:31+00:00 app[web.1]:   Rendered layouts/_shim.html.erb (0.0ms)
2012-07-18T06:13:31+00:00 app[web.1]:   Rendered layouts/_header.html.erb (1.9ms
)
2012-07-18T06:13:31+00:00 app[web.1]: Completed 500 Internal Server Error in 4ms

2012-07-18T06:13:31+00:00 app[web.1]:
2012-07-18T06:13:31+00:00 app[web.1]: ActionView::Template::Error (undefined met
hod `find_by_remember_token' for #<Class:0x00000004960740>):
2012-07-18T06:13:31+00:00 app[web.1]:     6:         <ul class="nav pull-right">

2012-07-18T06:13:31+00:00 app[web.1]:     7:           <li><%= link_to "Home", r
oot_path %></li>
2012-07-18T06:13:31+00:00 app[web.1]:     9:           <% if signed_in? %>
2012-07-18T06:13:31+00:00 app[web.1]:     11:             <li id="fat-menu" clas
s="dropdown">
2012-07-18T06:13:31+00:00 app[web.1]:     10:             <li><%= link_to "Users
", users_path %></li>
2012-07-18T06:13:31+00:00 app[web.1]:     8:           <li><%= link_to "Help", h
elp_path %></li>
2012-07-18T06:13:31+00:00 app[web.1]:     12:               <a href="#" class="d
ropdown-toggle" data-toggle="dropdown">
2012-07-18T06:13:31+00:00 app[web.1]:   app/helpers/sessions_helper.rb:10:in `cu
rrent_user'
2012-07-18T06:13:31+00:00 app[web.1]:   app/helpers/sessions_helper.rb:23:in `si
gned_in?'
2012-07-18T06:13:31+00:00 app[web.1]:   app/views/layouts/application.html.erb:1
1:in `_app_views_layouts_application_html_erb___2533055855927805914_43132200'
2012-07-18T06:13:31+00:00 app[web.1]:
2012-07-18T06:13:31+00:00 app[web.1]:   app/views/layouts/_header.html.erb:9:in
`_app_views_layouts__header_html_erb__2547305690965663969_41244280'
2012-07-18T06:13:31+00:00 app[web.1]:
2012-07-18T06:13:31+00:00 heroku[router]: GET whizcollab.herokuapp.com/ dyno=web
.1 queue=0 wait=0ms service=22ms status=500 bytes=643
2012-07-18T06:13:37+00:00 app[web.1]:
2012-07-18T06:13:37+00:00 app[web.1]:
2012-07-18T06:13:37+00:00 app[web.1]: Started GET "/users" for 115.87.214.246 at
 2012-07-18 06:13:37 +0000
2012-07-18T06:13:37+00:00 heroku[router]: GET whizcollab.herokuapp.com/users dyn
o=web.1 queue=0 wait=0ms service=47ms status=500 bytes=643
2012-07-18T06:13:37+00:00 app[web.1]: Processing by UsersController#index as HTM
L
2012-07-18T06:13:37+00:00 app[web.1]: Completed 500 Internal Server Error in 1ms

2012-07-18T06:13:37+00:00 app[web.1]:
2012-07-18T06:13:37+00:00 app[web.1]:   app/helpers/sessions_helper.rb:10:in `cu
rrent_user'
2012-07-18T06:13:37+00:00 app[web.1]: NoMethodError (undefined method `find_by_r
emember_token' for #<Class:0x00000004960740>):
2012-07-18T06:13:37+00:00 app[web.1]:   app/helpers/sessions_helper.rb:23:in `si
gned_in?'
2012-07-18T06:13:37+00:00 app[web.1]:   app/controllers/users_controller.rb:48:i
n `signed_in_user'
2012-07-18T06:13:37+00:00 app[web.1]:
2012-07-18T06:13:37+00:00 app[web.1]:

Answer 1

所以我也在做Hart教程并且正在进入相同的问题。我运行了heroku运行db：migrate ....我确保它是最新的git push heroku ....我在数据库中为我的一个用户添加了一个remember_key。它位于schema.rb文件中。

我终于找到了答案：

user.rb：

将：remember_token添加到attr_accessible

Ex：“attr_accessible：name，：email，：password，：password_confirmation，：remember_token”

由于某些原因，这是在教程之外，即使现在我知道什么是错的，这是有道理的。添加完之后，我再次推送到heroku和Viola ......

希望这会有所帮助：）

Answer 2

动态查找程序仅在您搜索的属性存在时才有效。您没有运行所有迁移，或者您只是没有该属性（remember_token）或者您拼错了它。

Answer 3

我有同样的问题，我要说恕我直言，没有必要添加:remember_token 到attr_accessible字段。这样做会暴露:remember_token，创建getter和setter，这是必要的，因为:remember_token必须被视为内部变量。我解决了重新启动Heroku应用程序的问题，如下所示：

heroku-nomethod-error-remember-token

重新启动后，应用程序正常运行，就像在本地执行一样。

Answer 4

它失败，因为它找不到以下方法find_by_remember_token的定义。我记得在Hartl教程的remember_token中定义了session_helper。似乎在调用signed_in?方法时出现。

您可以粘贴session_helper.rb和User型号代码吗？

Answer 5

尝试运行heroku restart。它为我做了伎俩。

应该注意，根据r4m's answer，不建议在:remembered_token声明中添加attr_accessible。（Hartl在教程中没有这样做是有原因的。）

Answer 6

该行：

ActionView::Template::Error (undefined method `find_by_remember_token' for #<Class:0x00000004960740>):

告诉你Rails不知道'find_by_remember_token'是什么，这意味着它不存在（即它是一个错字），或者通常用于确定类属性的数据库不是'意识到这个领域。

假设它不是拼写错误，那么迁移数据库将是一个选择：

heroku run rake db:migrate

Answer 7

当我尝试推送到heroku以及亚马逊时，我收到内部服务器错误。在将应用程序推送到服务器之前，我必须预先编译我的资产。如果这是您的问题，最简单的解决方案是运行

RAILS_ENV=production rake assets:precompile

或添加加载'部署/资产' 如果您使用的是Capistrano，请使用capfile。我被告知你可以将以下内容添加到deploy.rb文件中，但我无法使其正常工作。

after "deploy:restart", "deploy:precompile"

  namespace :deploy do

    desc "Compile assets"
    task :precompile, :roles => :app do
    run "cd #{release_path} && rake RAILS_ENV=#{rails_env} assets:precompile"
  end
end

Answer 8

对我来说有用的是完全按照教程中的描述在User模型中定义create_remember_token方法。

private
def create_remember_token
   self.remember_token = SecureRandom.urlsafe_base64
end

然后在before_save方法中调用它。

before_save { 
    self.email.downcase!
    create_remember_token
}

之前我没有将它作为方法声明。虽然它在我的计算机上运行，但它在Heroku中失败了。

#this failed in Heroku    
before_save { 
    self.email.downcase!
    self.remember_token = SecureRandom.urlsafe_base64
}

此外，运行也没有坏处：

heroku run rake db:migrate

Ruby on rails应用程序在本地工作但不适用于heroku

8 个答案: