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【Rails】バリアントの生成方法【ActiveStorage】

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以下のようにすると画像のバリアントを生成できます。

app/models/user.rb
class User < ApplicationRecord
  has_one_attached :avatar do |attachable|
    attachable.variant :large, resize_to_limit: [128, 128]
    attachable.variant :medium, resize_to_limit: [64, 64]
    attachable.variant :small, resize_to_limit: [32, 32]
  end
end

バリアントのURLを取得するには以下のようにします。

Rails.application.routes.url_helpers.rails_representation_url(avatar.variant(:large).processed, host: "localhost", port: "3000")
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