[Rails]simple_form 錯誤 error -undefined method 'number?'

undefined method 'number?' for #<ActiveRecord::ConnectionAdapters::PostgreSQLColumn:0x007fd89fda3d40>





解決方法>> 更改你的Gemfile


gem 'simple_form'

to

gem 'simple_form', github: 'kesha-antonov/simple_form', branch: 'rails-5-0'




然後bundle install,重開server  Done