undefined method `simple_nested_form_for'

问题

Why am I getting this error when trying to use the nested_form Rails plugin?

回答1:

Add the gem from the github directly, because the gem on rubygems is old:

gem "nested_form", :git => 'git://github.com/ryanb/nested_form.git'

来源：https://stackoverflow.com/questions/8195107/undefined-method-simple-nested-form-for