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like.rb

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class Like < ApplicationRecord
validates :user_id,{presence: true}
validates :post_id,{presence: true}
end
//バリデーションを追加する
いいねのデータは、user_idとpost_idの両方が常に存在していないと不完全なデータとなってしまいますので、最初にバリデーションを追加しておきましょう。user_idとpost_idのそれぞれに、値が存在していることをチェックする「presence: true」のバリデーションを追加します。
両方存在しないと不完全なデータになってしまう

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