如何使用preview_enabled = true在rails 4.2上配置動作郵件因爲

由於rails 4.2現在已經發布，我想在郵件中添加郵件預覽。在此之後我雖然它會簡單地把這個代碼：如何使用preview_enabled = true在rails 4.2上配置動作郵件因爲

config.action_mailer.preview_enabled = true 
config.action_mailer.preview_path = "#{Rails.root}/lib/mailer_previews"

我staging.rb文件，但它給了我method_missing的錯誤。

我做什麼錯了？有人能幫我嗎？

堆棧跟蹤：

method_missing': undefined method `preview_enabled=' for ActionMailer::Base:Class (NoMethodError) 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/actionmailer-4.2.0.rc1/lib/action_mailer/railtie.rb:41:in `block (3 levels) in <class:Railtie>' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/actionmailer-4.2.0.rc1/lib/action_mailer/railtie.rb:41:in `each' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/actionmailer-4.2.0.rc1/lib/action_mailer/railtie.rb:41:in `block (2 levels) in <class:Railtie>' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/activesupport-4.2.0.rc1/lib/active_support/lazy_load_hooks.rb:38:in `instance_eval' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/activesupport-4.2.0.rc1/lib/active_support/lazy_load_hooks.rb:38:in `execute_hook' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/activesupport-4.2.0.rc1/lib/active_support/lazy_load_hooks.rb:45:in `block in run_load_hooks' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/activesupport-4.2.0.rc1/lib/active_support/lazy_load_hooks.rb:44:in `each' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/activesupport-4.2.0.rc1/lib/active_support/lazy_load_hooks.rb:44:in `run_load_hooks' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/actionmailer-4.2.0.rc1/lib/action_mailer/base.rb:945:in `<class:Base>' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/actionmailer-4.2.0.rc1/lib/action_mailer/base.rb:417:in `<module:ActionMailer>' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/actionmailer-4.2.0.rc1/lib/action_mailer/base.rb:9:in `<top (required)>' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/actionmailer-4.2.0.rc1/lib/action_mailer/railtie.rb:59:in `block in <class:Railtie>' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/activesupport-4.2.0.rc1/lib/active_support/lazy_load_hooks.rb:36:in `call' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/activesupport-4.2.0.rc1/lib/active_support/lazy_load_hooks.rb:36:in `execute_hook' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/activesupport-4.2.0.rc1/lib/active_support/lazy_load_hooks.rb:45:in `block in run_load_hooks' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/activesupport-4.2.0.rc1/lib/active_support/lazy_load_hooks.rb:44:in `each' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/activesupport-4.2.0.rc1/lib/active_support/lazy_load_hooks.rb:44:in `run_load_hooks' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/railties-4.2.0.rc1/lib/rails/application/finisher.rb:62:in `block in <module:Finisher>' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/railties-4.2.0.rc1/lib/rails/initializable.rb:30:in `instance_exec' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/railties-4.2.0.rc1/lib/rails/initializable.rb:30:in `run' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/railties-4.2.0.rc1/lib/rails/initializable.rb:55:in `block in run_initializers' 
from /home/vagrant/.rvm/rubies/ruby-2.1.3/lib/ruby/2.1.0/tsort.rb:226:in `block in tsort_each' 
from /home/vagrant/.rvm/rubies/ruby-2.1.3/lib/ruby/2.1.0/tsort.rb:348:in `block (2 levels) in each_strongly_connected_component' 
from /home/vagrant/.rvm/rubies/ruby-2.1.3/lib/ruby/2.1.0/tsort.rb:427:in `each_strongly_connected_component_from' 
from /home/vagrant/.rvm/rubies/ruby-2.1.3/lib/ruby/2.1.0/tsort.rb:347:in `block in each_strongly_connected_component' 
from /home/vagrant/.rvm/rubies/ruby-2.1.3/lib/ruby/2.1.0/tsort.rb:345:in `each' 
from /home/vagrant/.rvm/rubies/ruby-2.1.3/lib/ruby/2.1.0/tsort.rb:345:in `call' 
from /home/vagrant/.rvm/rubies/ruby-2.1.3/lib/ruby/2.1.0/tsort.rb:345:in `each_strongly_connected_component' 
from /home/vagrant/.rvm/rubies/ruby-2.1.3/lib/ruby/2.1.0/tsort.rb:224:in `tsort_each' 
from /home/vagrant/.rvm/rubies/ruby-2.1.3/lib/ruby/2.1.0/tsort.rb:205:in `tsort_each' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/railties-4.2.0.rc1/lib/rails/initializable.rb:54:in `run_initializers' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/railties-4.2.0.rc1/lib/rails/application.rb:352:in `initialize!' 
from /home/vagrant/workspace/bankfacil/communicator/config/environment.rb:5:in `<top (required)>' 
from /home/vagrant/workspace/bankfacil/communicator/config.ru:3:in `require' 
from /home/vagrant/workspace/bankfacil/communicator/config.ru:3:in `block in <main>' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/rack-1.6.0.beta2/lib/rack/builder.rb:55:in `instance_eval' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/rack-1.6.0.beta2/lib/rack/builder.rb:55:in `initialize' 
from /home/vagrant/workspace/bankfacil/communicator/config.ru:in `new' 
from /home/vagrant/workspace/bankfacil/communicator/config.ru:in `<main>' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/rack-1.6.0.beta2/lib/rack/builder.rb:49:in `eval' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/rack-1.6.0.beta2/lib/rack/builder.rb:49:in `new_from_string' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/rack-1.6.0.beta2/lib/rack/builder.rb:40:in `parse_file' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/rack-1.6.0.beta2/lib/rack/server.rb:299:in `build_app_and_options_from_config' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/rack-1.6.0.beta2/lib/rack/server.rb:208:in `app' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/railties-4.2.0.rc1/lib/rails/commands/server.rb:61:in `app' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/rack-1.6.0.beta2/lib/rack/server.rb:336:in `wrapped_app' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/railties-4.2.0.rc1/lib/rails/commands/server.rb:139:in `log_to_stdout' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/railties-4.2.0.rc1/lib/rails/commands/server.rb:78:in `start' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/railties-4.2.0.rc1/lib/rails/commands/commands_tasks.rb:80:in `block in server' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/railties-4.2.0.rc1/lib/rails/commands/commands_tasks.rb:75:in `tap' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/railties-4.2.0.rc1/lib/rails/commands/commands_tasks.rb:75:in `server' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/railties-4.2.0.rc1/lib/rails/commands/commands_tasks.rb:39:in `run_command!' 
from /home/vagrant/.rvm/gems/ruby-2.1.3/gems/railties-4.2.0.rc1/lib/rails/commands.rb:17:in `<top (required)>' 
from bin/rails:4:in `require' 
from bin/rails:4:in `<main>'

來源

2014-12-04 Barbara Barbosa Claudino da Si

它的工作原理，在staging.rb，只需添加show_previews代替preview_enabled，像這樣：

config.consider_all_requests_local = true 

# mailer previews 
config.action_mailer.show_previews = true 
config.action_mailer.preview_path = "#{Rails.root}/lib/mailer_previews"

來源

2014-12-05 14:15:28

作爲替代使*所有*要求的地方，這在初始化程序中爲我工作：'如果Rails.env.staging？ class :: Rails :: MailersController def local_request？ true end end end' – Unixmonkey 2015-05-30 21:48:39

如何使用preview_enabled = true在rails 4.2上配置動作郵件因爲

回答

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