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ActiveStorageでBlobをアップロードする

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前提

  1. AWS ECS Fargate等の使用で、コンテナ内にファイル生成ができない環境を使用している
  2. ActionDispatch::Http::UploadedFile オブジェクトではない方法でファイルを受信している

方法

以下はBase64形式でPNG画像を受信した時、一時ファイルを生成せずにActiveStorageでアップロードする方法です。

image = "data:image/png;base64,xxxxx"
mime_type = image[%r/(image\/[a-z]{3,4})|(application\/[a-z]{3,4})/]
extension = mime_type[%r{\b(?!.*/).*}]
contents = image.sub(%r/data:((image|application)\/.{3,}),/, '')
decoded_data = Base64.decode64(contents)
blob = ActiveStorage::Blob.new(key: ActiveStorage::Blob.generate_unique_secure_token, filename: "image.#{extension}", content_type: mime_type)
blob.upload(StringIO.new(decoded_data, "rb"))

# ActiveRecord に ActiveStorage Objectをアタッチする場合は以下も記載
# ここでは Model を model, ActiveStorage をアタッチするカラムを image とする
# model.image.attach(blob)
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