How can I download a file from a URL and save it in Rails

Question

I have a URL to an image which i want to save locally  so that I can use Paperclip to produce a thumbnail for my application  What s the best way to download and save the image   I looked into ruby file handling but did not come across anything

User · Answer

Check out Net  HTTP in the standard library   The documentation provides several examples on how to download documents using HTTP

User · Answer

If you re using PaperClip  downloading from a URL is now handled automatically    Assuming you ve got something like   class MyModel  lt  ActiveRecord  Base   has attached file  image      end   On your model  just specify the image as a URL  something like this  written in deliberate longhand     my model   MyModel new image url   params  image url   my model image   URI parse image url    You ll probably want to put this in a method in your model  This will also work just fine on Heroku s temporary filesystem   Paperclip will take it from there   source  paperclip documentation

User · Answer

I think this is the clearest way   require  open-uri   File write  image png   open  http   example com image png   read

User · Answer

An even shorter version   require  open-uri  download   open  http   example com image png   IO copy stream download     image png     To keep the same filename   IO copy stream download       download base uri to s split      -1

User · Answer

Here s possibly the simplest way  IO copy stream URI open  quot https   i pinimg com originals 24 17 d6 2417d6b3f3dc236b0b5b80fb00b3a791 png quot     destination png

User · Answer

Try this   require  open-uri  open  image png    wb   do  file    file  lt  lt  open  http   example com image png   read end

[ruby-on-rails] How can I download a file from a URL and save it in Rails?

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