How to Download a File from a Url and Save It in Rails

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

Try this:

require 'open-uri'
open('image.png', 'wb') do |file|
  file << open('http://example.com/image.png').read
end

How can I download image from URL in rails using and save it to local disk(computer)?

Try with this

ImagesController

require 'open-uri'

def get_image_url
end

def download_image
  read_image = open(params[:image_url]).read
  File.open('/home/documents/image/image.png', 'wb') do |file|
    file.write read_image
  end
  redirect_to root_path
end

Create a new file in your images view
get_image_url.html.erb

<%= form_tag("/images/download_image", method: "post") do  %>
  <%= label_tag :image_url %>
  <%= text_field_tag :image_url %>
  <%= submit_tag 'Download' %>
<% end %>

routes.rb

post 'images/download_image'
get 'images/get_image_url'

Note: If you want to give different name to images make a method and pass it at image name and modify code (action name and files) according to your need.

Edit:
To get current folder path

pwd

rails download file from public folder

Instead of adding path in direct link, create one action which download the file from public folder.

routes.rb

get 'download_apk'

in your controller add below action which downloads apk file

def download_apk
  send_file("#{Rails.root}/public/App.apk")
end

Rails: How to to download a file from a http and save it into database

Use open-url (in the Ruby stdlib) to grab the files, then use a gem like paperclip to store them in the db as attachments to your models.

UPDATE:

Attachment_fu does not accept the raw bytes, it needs a "file-like" object. Use this example of a LocalFile along with the code below to dump the image into a temp file then send that to your model.

  http = Net::HTTP.new('www.google.com')
  http.start() { |http|
     req = Net::HTTP::Get.new("/intl/en_ALL/images/srpr/logo1w.png")
     response = http.request(req)
     tempfile = Tempfile.new('logo1w.png')
     File.open(tempfile.path,'w') do |f|
       f.write response.body
     end
     attachment = Attachment.new(:uploaded_data => LocalFile.new(tempfile.path))
     attachement.save
  }

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