Custom validations in rails: validates_number_range

rubyonrails-talk
1

http://sishen.lifegoo.com/?p=42

I don’t know whether there exists a builtin validation that can check the number range. I think the requirement is normal, but indeed, i can’t find it. So i wrote a custome validation: validates_number_range, whose prototype is validates_length_of. If there already exists one, pls tell me, :slight_smile:

The code is below, welcome to give me any advice on my blog. And also, more details information on the blog, :slight_smile:

2

No, that’s not i want to do. Sorry, my blog(http://sishen.lifegoo.com/?p=42) gives more information, so i gave less information in the mail.

My scenario is that I want to check the uploaded file size, for example, less than 5M. But what validates_length_of is the size, when is a fixnum, is 4. So validates_length_of can’t be work for me.

Using validates_number_range, now i can code as below:

validates_number_range :file_size,

                     :maximum => 5242880,

                     :message => "you can only upload file less than 5M",

                     :on => :create
3

Today i looked through the validations.rb in rails edge. I’m glad to find that validates_numericality_of method already has the support for range check.

The related options are

  • greater_than
  • greater_than_or_equal_to
  • equal_to
  • less_than
  • less_than_or_equal_to
  • odd
  • even With these, life are more better, :slight_smile: