如何在Rails中上传文件

Question

My app is a surveybuilder...it needs upload cvs files by users, Im working with rails 3.1.3., ruby 1.9.2 ande devise 1.5.3 for authentication, but I tried: http://www.jedi.be/blog/2009/04/10/rails-and-large-large-file-uploads-looking-at-the-alternatives/ but don't works for me...can anybody tell me how to (step by step...yes I'm a begginer) upload cvs files in rails 3.1.3??? thanks in advance.

Answer 1

If your goal is to upload a file to a directory you shouldn't have to use Carrierwave or Paperclip. Those gems have a lot of support for image processing and extra options.

I suggest you look at the Ruby file class and the open method to be more specific. http://www.ruby-doc.org/core-1.9.3/File.html#method-c-open

Something like the following should do the trick:

# "public/csv" is the directory you want to save the files in
# upload["datafile"] is the data populated by the file input tag in your html form 
path = File.join("public/csv", upload["datafile"].original_filename)
File.open(path, "wb") { |f| f.write(upload["datafile"].read) }

Keep in mind, your public directory is accessible to the world. If you need to save these in a more private location, make sure the directory is only readable and writable by your app.

Also, if you are working with CSV files, be sure to read through the Ruby CSV class: http://ruby-doc.org/stdlib-1.9.2/libdoc/csv/rdoc/CSV.html . It makes working with CSV files a breeze.

Answer 2

Carrierwave ( https://github.com/jnicklas/carrierwave ) is pretty much the standard when it comes to files uploading.

Otherwise, here is a simplier method if you don't need a full-fledged gem: Rails 3 - upload files to public directory

Answer 3

我在github中使用javascript在Rails 3.2.1中找到了一个出色的项目，您可以上传文件并将其保存在数据库中，是通过sqlite完成的，但是将其更改为mysql很容易，这里是链接： 在Rails 3.2.1，javascript和sqlite