How can I find the size of an uploaded file in Ruby on Rails?

Question

I am not using carrierwave or paperclip for my file upload. I want to find out the file extension and the size in bytes of a file that the user has uploaded? Any ideas on how I can achieve this?

Accepted Answer

```
File.size(doc.filename)
```

Just throw the name of the file into the curly brackets and you should be set.

If you want KB/MB use:

```
number_to_human_size(File.size(doc.filename))
```

EDIT:

You can use the exact path or Pathname

```
1.9.3p125 :005 > x=Pathname.new("/usr/bin/ruby")
 => #<Pathname:/usr/bin/ruby> 
1.9.3p125 :006 > File.size(x)
 => 5488 
```

For extension:

```
File.extname("test.rb")         #=> ".rb"
```

How can I find the size of an uploaded file in Ruby on Rails?

Solution

Problem