Heroku - 如何写入“tmp”目录？ [英] Heroku - how to write into "tmp" directory?

问题描述

我需要使用Heroku（Cedar）上的 tmp 文件夹来编写一些临时数据，我试图这样做：

  open（＃{Rails.root} / tmp /＃{result ['filename']}，'wb'）do | file | 
 file.write open（image_url）.read 
 end 
  

错误

  Errno :: ENOENT：没有这样的文件或目录 -  /app/tmp/image-2.png 
  

我正在尝试这段代码，它在localhost上正常运行，但我无法在Heroku上运行。

保存一些文件到Heroku（Cedar stack）的 tmp 目录的正确方法是什么？

谢谢

编辑：
我正在运行需要延迟作业的方法访问tmp文件。

EDIT2：
我在做什么：

  files.each_with_index do | f，index | 
除非f.nil？ 
 result = JSON.parse（buffer）
 filename =＃{Time.now.to_i.to_s} _＃{result ['filename']}＃缩略图名称
 thumb_filename = ＃{Rails.root} / tmp /＃{filename}
 
 image_url = f.file_url +/ convert？rotate = exif
 
 open root} / tmp /＃{result ['filename']}，'wb'）do | file | 
 file.write open（image_url）.read 
 end 
 
 img = Magick :: Image.read（image_url）.first 
 target = Magick :: Image。 new（150，150）do 
 self.background_color ='white'
 end 
 img.resize_to_fit！（150，150）
 target.composite（img，Magick :: CenterGravity ，Magick :: CopyCompositeOp）.write（thumb_filename）
 
 key = File.basename（filename）
 s3.buckets [bucket_name] .objects [key] .write（：file => thumb_filename）
 
＃将新缩略图的路径保存到数据库
 f.update_attributes（：file_url_thumb =>https://s3-us-west-1.amazonaws.com/bucket /＃{filename}）
 end 
 end 
  

有关图像的信息。这些图像存储在Amazon S3存储桶中。我需要为这些图像创建缩略图。因此，我正在通过另一个图像浏览一个图像，加载图像，暂时保存图像，然后调整图像大小，之后我会将此缩略图上传到S3存储区。

过程似乎没有在Heroku上工作，所以，我怎么能这样做（我的应用程序在Heroku上运行）？

解决方案

是否包含在你的git仓库中的 / tmp ？已删除在 .slugignore 中？

p

尝试在写入之前在快速mkdir中进行折腾：

 Dir.mkdir（File.join（Rails.root，'tmp'））
  

或甚至在初始化器或其他东西中......

I need to use the tmp folder on Heroku (Cedar) for writing some temporarily data, I am trying to do that this way:

open("#{Rails.root}/tmp/#{result['filename']}", 'wb') do |file|
  file.write open(image_url).read 
end

But this produce error

Errno::ENOENT: No such file or directory - /app/tmp/image-2.png

I am trying this code and it's running properly on localhost, but I cannot make it work on Heroku.

What is the proper way to save some files to the tmp directory on Heroku (Cedar stack)?

Thank you

EDIT: I am running method with Delayed Jobs that needs to has access to the tmp file.

EDIT2: What I am doing:

files.each_with_index do |f, index|
      unless f.nil?
        result = JSON.parse(buffer)
        filename = "#{Time.now.to_i.to_s}_#{result['filename']}" # thumbnail name
        thumb_filename = "#{Rails.root}/tmp/#{filename}"

        image_url = f.file_url+"/convert?rotate=exif"

        open("#{Rails.root}/tmp/#{result['filename']}", 'wb') do |file|
          file.write open(image_url).read 
        end

        img = Magick::Image.read(image_url).first
        target = Magick::Image.new(150, 150) do
          self.background_color = 'white'
        end
        img.resize_to_fit!(150, 150)
        target.composite(img, Magick::CenterGravity, Magick::CopyCompositeOp).write(thumb_filename)

        key = File.basename(filename)
        s3.buckets[bucket_name].objects[key].write(:file => thumb_filename)

        # save path to the new thumbnail to database
        f.update_attributes(:file_url_thumb => "https://s3-us-west-1.amazonaws.com/bucket/#{filename}")
      end
    end

I have in database information about images. These images are stored in Amazon S3 bucket. I need to create thumbnails to these images. So I am going through one image by another one, load the image, temporarily save it, then resize it and afterwards I will upload this thumbnail to S3 bucket.

But this procedure doesn't seems to be working on Heroku, so, how could I do that (my app is running on Heroku)?

解决方案

Is /tmp included in your git repo? Removed in your .slugignore? The directory may just not exist out on Heroku.

Try tossing in a quick mkdir before the write:

Dir.mkdir(File.join(Rails.root, 'tmp'))

Or even in an initializer or something...

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