MS
Size: a a a
MS
U
PT
PT
PT
MS
MS
U
MS
MS
MS
U
MS
U
DO
class Article < ApplicationRecord
has_one :scope_article_scheme
end
class ScopeArticleScheme < ApplicationRecord
belongs_to :article, optional: true
end
A.where(id: 1).destroy_all
DO
has_one :b, dependent: :destroy
DO
DS
DS