如何在使用 ActiveStorage 上传到云之前压缩图像

问题描述

为了节省云中的空间，您将如何使用 activestorage 调整和压缩图像的大小?

To save space in the cloud how would you go about resizing and compressing an image preupload using activestorage?

推荐答案

我在本地存储的开发中测试了下面的这段代码，它可以工作，但无论如何都会出现一些问题，我将在接下来解释.

I tested this code below in development on local storage and it works, but anyway gives some problems that I will explain next.

在创建时这似乎工作正常，即使我认为应该有一种更简洁的方法来做到这一点.

On create this seems to work fine, even if I suppose there should be a cleaner way to do so.

class User < ApplicationRecord
  has_one_attached :avatar

  before_save :resize_avatar_image

  def resize_avatar_image
    filename = avatar.filename.to_s
    puts attachment_path = "#{Dir.tmpdir}/#{avatar.filename}"
    File.open(attachment_path, 'wb') do |file|
       file.write(avatar.download)
       file.close
    end
    image = MiniMagick::Image.open(attachment_path)
    # if image.width ...
    image.resize "40x40"
    image.write attachment_path
    avatar.attach(io: File.open(attachment_path), filename: filename, content_type: "image/jpg")
  end

end

我遇到的问题，有人可以克服

1. 如果不下载到临时文件以便使用 MiniMagick 进行处理，我就无法即时应用变体
2. 更新(编辑)时，由于 purge 和 purge_later 方法错误，过程很慢:[ActiveJob] [ActiveStorage::PurgeJob] [d6a930ee-32cd-45a7-bfb5-72929d79f9bb] 执行 ActiveStorage::PurgeJob 时出错(作业 ID:d6a930ee-32cd-45a7-bfb5-72929d79f9bb)从异步(默认)在 0.33 毫秒内:ArgumentError(参数数量错误(给定 0，预期为 1))；我找不到解决方法.检查旧 blob 是否已删除.
3. 第2点提到的问题似乎与.attach方法有关；
4. 我只测试了 *.jpg 和 *.png
5. 未在生产中或远程存储中进行测试

1. I was not able to apply variations on the fly without downloading to a temp file in order to process it with MiniMagick
2. When updating (edit) the process is slow because of errors with purge and purge_later methods: [ActiveJob] [ActiveStorage::PurgeJob] [d6a930ee-32cd-45a7-bfb5-72929d79f9bb] Error performing ActiveStorage::PurgeJob (Job ID: d6a930ee-32cd-45a7-bfb5-72929d79f9bb) from Async(default) in 0.33ms: ArgumentError (wrong number of arguments (given 0, expected 1)); I could not find a workaround. Check if the old blob was deleted.
3. The problem mentioned at point 2 seems to be related with .attach method;
4. I tested only *.jpg and *.png
5. Not tested in production nor for remote storage

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