aa_schema_ex.rb

ActiveAdmin.register SomeResource do
  permit_params :title, :announcement
  
  schema do
    required(:announcement).filled(:str?)
    required(:title).filled(:str?)
  end
  
  form do |f|
    f.semantic_errors(*f.object.errors.keys)
    f.inputs do
      f.input :title
      f.input :announcement, as: :text
    end
  end
end