RoR: Model validation question

Question

I have a basic ActiveRecord model in which i have two fields that i would like to validate. The requirement is that at least one of the fields must have a value. Both can have values, but at least one needs a value.

How do i express this with

validates_presence_of

statements? For example:

validates_presence_of :main_file
validates_presence_of :alt_file

i don't want an error to be generated if only one of them is empty, only if both are empty.

Bartosz Blimke · Accepted Answer · 2008-10-03 00:45:43Z

5

validates_presence_of :main_file, :if => Proc.new { |p| p.alt_file.blank? }
validates_presence_of :alt_file, :if => Proc.new { |p| p.main_file.blank? }

edited Oct 3, 2008 at 0:45

answered Oct 2, 2008 at 13:44

Bartosz Blimke

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1 Comment

Christoph Schiessl Over a year ago

Wouldn't it be better to blank? instead of nil??

Jason Miesionczek · Accepted Answer · 2008-10-02 14:24:25Z

3

changing .nil? to .blank? does the trick!

answered Oct 2, 2008 at 14:24

Jason Miesionczek

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