[英]undefined method for ActionMailer::Base:Class (NoMethodError)
我已经从5降级到Rails版本4.2.3，因为我遇到了一些问题，现在如果我尝试启动服务器，我会在终端中不断收到此错误，并且服务器将无法运行。 我如何摆脱这个错误？
/Users/username/.rvm/gems/ruby-2.3.1/gems/actionmailer-4.2.8/lib/action_mailer/base.rb:569:in `method_missing': undefined method `perform_caching=' for ActionMailer::Base:Class (NoMethodError)
我不得不在development.rb中注释掉#config.action_mailer.perform_caching = false
ActionMailer — NoMethodError：MyMailer：Class的未定义方法X
[英]ActionMailer — NoMethodError: undefined method X for MyMailer:Class
Rails 4中ActionMailer :: Base：Class的未定义方法'async ='
[英]undefined method `async=' for ActionMailer::Base:Class in rails 4
ActionMailer：my_class＃create为nil：NilClass创建未定义的方法“ each”的NoMethodError
[英]ActionMailer : NoMethodError in my_class#create undefined method `each' for nil:NilClass
ActionView :: Base的未定义方法`cache_template_extensions ='：Class（NoMethodError）
[英]Undefined method `cache_template_extensions=' for ActionView::Base:Class (NoMethodError)
用于ActiveRecord :: Base的未定义方法`mass_assignment_sanitizer ='：Class（NoMethodError）
[英]Undefined method `mass_assignment_sanitizer=' for ActiveRecord::Base:Class (NoMethodError)
错误NoMethodError：ActionView :: Base的未定义方法`debug_rjs ='：Class
[英]ERROR NoMethodError: undefined method `debug_rjs=' for ActionView::Base:Class
未定义的方法 raise_in_transactional_callbacks=' 用于 ActiveRecord::Base:Class (NoMethodError)
[英]Undefined method raise_in_transactional_callbacks=' for ActiveRecord::Base:Class (NoMethodError)
使用ApplicationHelper的ActionMailer类中的未定义方法
[英]Undefined method in ActionMailer class with ApplicationHelper
NoMethodError：nil的未定义方法'env'：ActionMailer :: TestCase中的NilClass
[英]NoMethodError: undefined method 'env' for nil:NilClass in ActionMailer::TestCase
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