#create failing silently when a embedded_attribute validation fails

[wemcdonald]

create fails silently if an embedded has_one object has a validation error.

class Question < ActiveRecord::Base
  has_one :answer
  accepts_nested_attributes_for :answer
end

class Answer < ActiveRecord::Base
  belongs_to :question
  validates :text, :inclusion => %w{42 no}
end

POST to /activeadmin/questions:

Processing by Activeadmin::QuestionsController#create as HTML
Parameters: {"question"=>{"answer_attributes"=>{"text"=>"yes"}}, "commit"=>"Create Question"}

What I see

AA redirects to ActiveAdmin::QuestionsController#new and logs no errors

What I expect to see

A validation error

[drush]

+1

[netpenthe]

+1

[jpmckinney]

AA should really just render errors on :base to fix issues like this one.

[jpmckinney]

See #905

[jpmckinney]

Marking as dupe of #905