Download files from rails

All rights reserved. Lessons See the full list of screencasts to learn from. Guides Tutorials to help you setup Rails on your development and deploy to production. New to Ruby on Rails? New Start learning Ruby on Rails from scratch with our free Beginner tutorial. As a quick test to make sure everything is set up, you should be able to run the script and see the files download in the local directory. We can use the basic zip creation example from the RubyZip readme for it.

If you want, you could also re-upload it back to S3. One method I tried first to see if it would be quicker in creating the zip was to stream the files from S3. It works as simply as:. When we tested with small files, this method was faster and zipped the files more quickly than writing them to disk. However, when we tested it with large files, the workers completely ran out of memory.

So, in the end, we decided not to use this method, as it was memory intensive for the workers our files are huge. It may be useful if you are planning on zipping small sized files, though. Connect and share knowledge within a single location that is structured and easy to search. I can't seem to find a simple and clear answer to this problem anywhere! Everything seems either outdated or incomplete! I just want the user to be able to click on a link or button and download a file that is somewhere in the public folder.

This opens up a massive security hole, allowing a user to access any file that is readable by your application namely, your entire application, but also possibly other files on the filesystem. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. How to download a file from rails application Ask Question. Read on to find out how. The most popular way to download a file without any dependencies is to use the standard library open-uri. Kernel open is a method that you can use to open files, streams, or processes to read to or write from.

For example, you can open a file and read its contents with the following code:. We can use this to download an image and then save it as a file. To do so, we first require open-uri then use the open method to access an image URL. We can then open up a file and write the contents of the image to the file. Open up IRB and try the following:. This is a success, but this was a straightforward example. In practice you would want to handle potential errors, such as a error for a missing image.

Plus, there's a bunch of other potential issues with using open-uri. The thing is, using open-uri like this is not ideal.

First up, the above code is not very memory efficient, it loads the entire image into memory and then writes to disk. Many consists refer to engines or wagons from the original MSTS routes but those can be easily replaced with other engines or wagons. Only very few routes provide a full new sound set, so the original files included in this folder are usually needed. Note that many routes — in particular freeware routes — use content from the original MSTS routes, and therefore when installing new routes you may find their installation requires files from the original MSTS routes in order to be properly installed.

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