当Ruby on Rails应用程序启动时，我希望它运行一段代码，以便数据库充满所需的数据。我一直在寻找解决方案的时间，我找到的解决方案都没有。以下是我实施的解决方案。
在application.rb中，我放置了以下代码块：
def fill_db
redirect_to url_for(:controller => :item, :action => :init)
self.delay(:run_at => 10.minute.from_now).fill_db
end
config.after_initialize do
redirect_to url_for(:controller => :item, :action => :init)
fill_db
end
我试图实现其他几十种变体，但都没有。
我得到的错误是：
C:\xampp\htdocs\dev-ruby\untitled1>rails s
=> Booting WEBrick
=> Rails 4.2.6 application starting in development on http://localhost:3000
=> Run `rails server -h` for more startup options
=> Ctrl-C to shutdown server
Exiting
C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.2.6/lib/rails/railtie.rb:196:in `method_missing': undefined method `url_for' for Untitled1::Application:Class (NoMethodError)
from C:/xampp/htdocs/dev-ruby/untitled1/config/application.rb:40:in `block in <class:Application>'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/activesupport-4.2.6/lib/active_support/lazy_load_hooks.rb:36:in `call'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/activesupport-4.2.6/lib/active_support/lazy_load_hooks.rb:36:in `execute_hook'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/activesupport-4.2.6/lib/active_support/lazy_load_hooks.rb:45:in `block in run_load_hooks'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/activesupport-4.2.6/lib/active_support/lazy_load_hooks.rb:44:in `each'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/activesupport-4.2.6/lib/active_support/lazy_load_hooks.rb:44:in `run_load_hooks'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.2.6/lib/rails/application/finisher.rb:62:in `block in <module:Finisher>'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.2.6/lib/rails/initializable.rb:30:in `instance_exec'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.2.6/lib/rails/initializable.rb:30:in `run'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.2.6/lib/rails/initializable.rb:55:in `block in run_initializers'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/tsort.rb:226:in `block in tsort_each'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/tsort.rb:348:in `block (2 levels) in each_strongly_connected_component'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/tsort.rb:427:in `each_strongly_connected_component_from'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/tsort.rb:347:in `block in each_strongly_connected_component'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/tsort.rb:345:in `each'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/tsort.rb:345:in `call'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/tsort.rb:345:in `each_strongly_connected_component'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/tsort.rb:224:in `tsort_each'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/tsort.rb:205:in `tsort_each'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.2.6/lib/rails/initializable.rb:54:in `run_initializers'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.2.6/lib/rails/application.rb:352:in `initialize!'
from C:/xampp/htdocs/dev-ruby/untitled1/config/environment.rb:5:in `<top (required)>'
from C:/xampp/htdocs/dev-ruby/untitled1/config.ru:3:in `require'
from C:/xampp/htdocs/dev-ruby/untitled1/config.ru:3:in `block in <main>'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rack-1.6.4/lib/rack/builder.rb:55:in `instance_eval'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rack-1.6.4/lib/rack/builder.rb:55:in `initialize'
from C:/xampp/htdocs/dev-ruby/untitled1/config.ru:in `new'
from C:/xampp/htdocs/dev-ruby/untitled1/config.ru:in `<main>'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rack-1.6.4/lib/rack/builder.rb:49:in `eval'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rack-1.6.4/lib/rack/builder.rb:49:in `new_from_string'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rack-1.6.4/lib/rack/builder.rb:40:in `parse_file'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rack-1.6.4/lib/rack/server.rb:299:in `build_app_and_options_from_config'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rack-1.6.4/lib/rack/server.rb:208:in `app'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.2.6/lib/rails/commands/server.rb:61:in `app'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rack-1.6.4/lib/rack/server.rb:336:in `wrapped_app'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.2.6/lib/rails/commands/server.rb:139:in `log_to_stdout'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.2.6/lib/rails/commands/server.rb:78:in `start'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.2.6/lib/rails/commands/commands_tasks.rb:80:in `block in server'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.2.6/lib/rails/commands/commands_tasks.rb:75:in `tap'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.2.6/lib/rails/commands/commands_tasks.rb:75:in `server'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.2.6/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.2.6/lib/rails/commands.rb:17:in `<top (required)>'
from bin/rails:4:in `require'
from bin/rails:4:in `<main>'
相同的代码在控制器中工作，但是它不会在rails服务器的启动时执行。
答案 0 :(得分：1)
您不能在application.rb中使用redirect_to。这是ActionController类的一部分。您可以做以下两件事
1）实现db：seed - 有一个db / seed.rb可用于填充初始数据库值。部署代码后，只需运行bin / rails db：seed来运行将填写数据库的任务
或
2）将before_action添加到applicationController
class ApplicationController < ActionController::Base
before_action :fill_db
end
要防止执行此方法，请添加条件，除非已填充？
希望有所帮助