Trouble with accepts_nested_attributes_for in Rails 5.0.0.beta3, -api option

Question

I am using Rails 5.0.0.beta3, building an API-only app using the -app option on rails new, and I am having trouble with accepts_nested_attributes_for.

In my app, a

Answer 1

I also encountered the same problem.
It seems specification has been changed from Rails 5.
By putting the option, and the previous and the same operation.

belongs_to should default to required: true #18233

class Post < ApplicationRecord
  belongs_to :member, optional: true
end

It is my clumsy may speak English, but ...