我已经从头开始创建了多个rails应用程序，但不知怎的，我无法修复<table class="table table-striped table-bordered zero-configuration">
<thead>
<tr>
<th style="width: 200px">Siswa</th>
<!-- <?php for($i = 1; $i < 31; ++$i){?>
<th><?= $i ?></th>
<?php } ?> -->
<?php foreach($workdays as $w){ ?>
<th><?=$w;?></th>
<?php } ?>
</tr>
</thead>
<tbody>
<?php
// for($x = 1; $x < 27; ++$x){
foreach($records as $r){
?>
<tr>
<td style="width: 200px"><?=$r->StudentName;?></td>
<?php
?>
<?php
foreach($workdays as $w){
foreach($tanggale as $t){
if($w == $t){
?>
<td style="background: #FFF000">M</td>
<?php }else{ ?>
<td style="background: #48C9A9">O</td>
<?php } } } ?>
</tr>
<?php } ?>
</tbody>
</table>
。为了重现错误，我使用以下命令创建了新的应用程序，
Circular dependency error之后我编辑了模型，如下所示，
应用/模型/ machine_image.rb
rails new circular_test -d mysql
cd circular_test
rails g model MyImage
rails g scaffold MachineImage
rm db/migrate/20170419063916_create_my_image.rb
rails db:create
rails db:migrate
应用/模型/ my_image.rb
class MachineImage < ApplicationRecord
AVAILABLE_FLAVORS = { "MyImage" => MyImage}
end
其他所有内容都保留默认设置。没有任何改变。请注意，class MyImage < MachineImage
end
继承自MyImage，而不是MachineImage。当我在开发环境中运行此应用程序时，一切正常。但是当我在生产模式下运行应用程序时（我确保db：create＆amp; db：migrate也为prod环境完成），
RAILS_ENV =生产轨道s
我在运行上述命令时遇到以下错误，
ApplicationRecord我能够通过在production.rb中创建=> Booting Puma
=> Rails 5.0.2 application starting in production on http://0.0.0.0:3000
=> Run `rails server -h` for more startup options
Exiting
/Users/abhigup/.rvm/gems/ruby-2.2.2/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:509:in `load_missing_constant': Circular dependency detected while autoloading constant MyImage (RuntimeError)
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:203:in `const_missing'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:543:in `load_missing_constant'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:203:in `const_missing'
from /Users/abhigup/Work/git/circular_test/app/models/machine_image.rb:2:in `<class:MachineImage>'
from /Users/abhigup/Work/git/circular_test/app/models/machine_image.rb:1:in `<top (required)>'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:293:in `require'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:293:in `block in require'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:259:in `load_dependency'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:293:in `require'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:380:in `block in require_or_load'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:37:in `block in load_interlock'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/activesupport-5.0.2/lib/active_support/dependencies/interlock.rb:12:in `block in loading'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/activesupport-5.0.2/lib/active_support/concurrency/share_lock.rb:150:in `exclusive'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/activesupport-5.0.2/lib/active_support/dependencies/interlock.rb:11:in `loading'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:37:in `load_interlock'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:358:in `require_or_load'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:511:in `load_missing_constant'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:203:in `const_missing'
from /Users/abhigup/Work/git/circular_test/app/models/my_image.rb:1:in `<top (required)>'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:293:in `require'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:293:in `block in require'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:259:in `load_dependency'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:293:in `require'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:380:in `block in require_or_load'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:37:in `block in load_interlock'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/activesupport-5.0.2/lib/active_support/dependencies/interlock.rb:12:in `block in loading'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/activesupport-5.0.2/lib/active_support/concurrency/share_lock.rb:150:in `exclusive'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/activesupport-5.0.2/lib/active_support/dependencies/interlock.rb:11:in `loading'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:37:in `load_interlock'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:358:in `require_or_load'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:336:in `depend_on'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:252:in `require_dependency'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/railties-5.0.2/lib/rails/engine.rb:476:in `block (2 levels) in eager_load!'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/railties-5.0.2/lib/rails/engine.rb:475:in `each'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/railties-5.0.2/lib/rails/engine.rb:475:in `block in eager_load!'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/railties-5.0.2/lib/rails/engine.rb:473:in `each'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/railties-5.0.2/lib/rails/engine.rb:473:in `eager_load!'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/railties-5.0.2/lib/rails/engine.rb:354:in `eager_load!'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/railties-5.0.2/lib/rails/application/finisher.rb:59:in `each'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/railties-5.0.2/lib/rails/application/finisher.rb:59:in `block in <module:Finisher>'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/railties-5.0.2/lib/rails/initializable.rb:30:in `instance_exec'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/railties-5.0.2/lib/rails/initializable.rb:30:in `run'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/railties-5.0.2/lib/rails/initializable.rb:55:in `block in run_initializers'
from /Users/abhigup/.rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/tsort.rb:226:in `block in tsort_each'
from /Users/abhigup/.rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/tsort.rb:348:in `block (2 levels) in each_strongly_connected_component'
from /Users/abhigup/.rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/tsort.rb:429:in `each_strongly_connected_component_from'
from /Users/abhigup/.rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/tsort.rb:347:in `block in each_strongly_connected_component'
from /Users/abhigup/.rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/tsort.rb:345:in `each'
from /Users/abhigup/.rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/tsort.rb:345:in `call'
from /Users/abhigup/.rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/tsort.rb:345:in `each_strongly_connected_component'
from /Users/abhigup/.rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/tsort.rb:224:in `tsort_each'
from /Users/abhigup/.rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/tsort.rb:203:in `tsort_each'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/railties-5.0.2/lib/rails/initializable.rb:54:in `run_initializers'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/railties-5.0.2/lib/rails/application.rb:352:in `initialize!'
from /Users/abhigup/Work/git/circular_test/config/environment.rb:5:in `<top (required)>'
from /Users/abhigup/Work/git/circular_test/config.ru:3:in `require_relative'
from /Users/abhigup/Work/git/circular_test/config.ru:3:in `block in <main>'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/rack-2.0.1/lib/rack/builder.rb:55:in `instance_eval'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/rack-2.0.1/lib/rack/builder.rb:55:in `initialize'
from /Users/abhigup/Work/git/circular_test/config.ru:in `new'
from /Users/abhigup/Work/git/circular_test/config.ru:in `<main>'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/rack-2.0.1/lib/rack/builder.rb:49:in `eval'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/rack-2.0.1/lib/rack/builder.rb:49:in `new_from_string'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/rack-2.0.1/lib/rack/builder.rb:40:in `parse_file'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/rack-2.0.1/lib/rack/server.rb:318:in `build_app_and_options_from_config'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/rack-2.0.1/lib/rack/server.rb:218:in `app'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/railties-5.0.2/lib/rails/commands/server.rb:59:in `app'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/rack-2.0.1/lib/rack/server.rb:353:in `wrapped_app'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/rack-2.0.1/lib/rack/server.rb:282:in `start'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/railties-5.0.2/lib/rails/commands/server.rb:79:in `start'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/railties-5.0.2/lib/rails/commands/commands_tasks.rb:90:in `block in server'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/railties-5.0.2/lib/rails/commands/commands_tasks.rb:85:in `tap'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/railties-5.0.2/lib/rails/commands/commands_tasks.rb:85:in `server'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/railties-5.0.2/lib/rails/commands/commands_tasks.rb:49:in `run_command!'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/railties-5.0.2/lib/rails/commands.rb:18:in `<top (required)>'
from /Users/abhigup/Work/git/circular_test/bin/rails:9:in `require'
from /Users/abhigup/Work/git/circular_test/bin/rails:9:in `<top (required)>'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/spring-2.0.1/lib/spring/client/rails.rb:28:in `load'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/spring-2.0.1/lib/spring/client/rails.rb:28:in `call'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/spring-2.0.1/lib/spring/client/command.rb:7:in `call'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/spring-2.0.1/lib/spring/client.rb:30:in `run'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/spring-2.0.1/bin/spring:49:in `<top (required)>'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/spring-2.0.1/lib/spring/binstub.rb:31:in `load'
from /Users/abhigup/.rvm/gems/ruby-2.2.2/gems/spring-2.0.1/lib/spring/binstub.rb:31:in `<top (required)>'
from /Users/abhigup/.rvm/rubies/ruby-2.2.2/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:69:in `require'
from /Users/abhigup/.rvm/rubies/ruby-2.2.2/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:69:in `require'
from /Users/abhigup/Work/git/circular_test/bin/spring:15:in `<top (required)>'
from bin/rails:3:in `load'
from bin/rails:3:in `<main>'
来解决问题，但这不是解决此问题的理想方法。对于插件，在我之前的应用程序中，我有类似的结构，但它在生产模式下完美无缺。唯一不同的是，它使用的是SQLite。 MySQL是否会在这种结构中产生问题？如果没有，解决这个问题的理想方法是什么？
注意：我已尝试查看this，但它并不适用于我。由于此错误与config.eager_load = false相关。
Ruby版本：2.2.2
Rails版本：5.0.2
操作系统：macOS Sierra 10.12.4
MySQL版本：5.7.17 Homebrew
更新：我找到了this文章，其中谈到了可能的原因。但它没有说明，为什么只有当我尝试使用MySQL时逻辑才会失败。
答案 0 :(得分：2)
我会说超类不应该真正了解子类，但是如果你必须这样做，在你的特定情况下而不是有一个常量的AVAILABLE_FLAVORS，那就把它变成一个类方法：
def self.available_flavors
{ "MyImage" => MyImage}
end
加载类时不会调用此方法，因此没有循环依赖。