外部キーのnilを許可する
# 飼い主
class Owner < ApplicationRecord
has_many :pets
end
# ペット
class Pet < ApplicationRecord
belongs_to :owner, optional: true
end
モデルが悪いのは気にしない・・・
optional: trueにしてしまうと飼い主がいないペットができてしまう
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