Ruby ActiveRecord: validate format of an integer field

Question

I'm trying to validate the format of a field in an ActiveRecord. I want this field to either be empty, or contain a sequence of digits only (it is containing an optional port number for a database connection). I'm currently trying this:

validates_format_of :port, with: /\A[0-9]*\Z/, message: 'Only numbers allowed'

but without luck. I've found that adding a required number by using for example {1, 6} sort of works, but makes the field mandatory.

Any advice?

Many thanks in advance,

Joseph.

possible duplicate of Rails 3 - Make text field accept only numeric values — James Chevalier
– James Chevalier, Commented Jul 23, 2013 at 1:18

James Chevalier · Accepted Answer · 2013-07-23 01:09:16Z

6

If you're looking to validate so that only numbers are allowed, then you should be able to use this:

validates :port, :numericality => {:only_integer => true}

answered Jul 23, 2013 at 1:09

James Chevalier

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Joseph Paterson Over a year ago

That works like a charm, thanks! Added allow_blank: true to complete the validation.

Ricky Zein · Accepted Answer · 2013-07-23 01:12:31Z

3

You may want to try to validate the numericality of the field, like so:

validates_numericality_of :port, :only_integer => true

:only_integer will ensure that the value entered for :port is an integer.

answered Jul 23, 2013 at 1:12

Ricky Zein

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PinnyM · Accepted Answer · 2013-07-23 01:11:15Z

1

You can also just add allow_blank: true

answered Jul 23, 2013 at 1:11

PinnyM

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aallamand · Accepted Answer · 2017-08-09 09:48:05Z

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You can use this syntax as well

validates numericality: :only_integer

answered Aug 9, 2017 at 9:48

aallamand

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