# Simulating "allow\_blank"

**URL:** <https://www.ruby-forum.com/t/simulating-allow-blank/132223>\
**Category:** Ruby\
**Created:** [March 18, 2008, 1:23am UTC](https://www.ruby-forum.com/t/simulating-allow-blank/132223 "2008-03-18T01:23:00Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![laredotornado](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/9dc877/32.png) [@laredotornado](https://www.ruby-forum.com/u/laredotornado)\
**Post date:** [March 18, 2008, 1:23am UTC](https://www.ruby-forum.com/t/simulating-allow-blank/132223/1 "2008-03-18T01:23:00Z")

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Hi,

I’m using an older version of RoR (1.2.3) – a constraint of the  
hosting company. When validating a model, the term “allow\_blank”  
doesn’t seem to be supported. Is there an equivalent way of writing  
the condition?

Thanks, - Dave