Rails 4 Numericality Validation Not Throwing Error when Text Submitted

Question

I have a Rails 4 form which saves nested associations, using the simple_form gem, and Postgres as the DBMS. One of the models saved in the form has 2 numeric input fields. The validation rules for these fields are as follows:

validates_numericality_of :field1, greater_than: 0, only_integer: true, allow_nil: true
validates_numericality_of :field2, allow_nil: true

If I type strings like "ten" or "thirty-five" or "$$$$$" into these fields, no validation errors occur, the form data is saved, and these fields are given a nil value. If I put a negative or decimal value into field1, the expected validation error is presented.

While this is unlikely to cause a tremendous amount of problems with the administrators using this form, I can't seem to explain why this happens. All other validations for this form work as expected.

Why are these values converted to nil? Why do I not get a non-numeric validation error? Is this just an annoying quirk to the allow_nil property?

Ilya · Accepted Answer · 2016-04-25 17:10:14Z

1

According to documentation, when you set only_integer: true, your value applying to the regular expression /\A[+\-]?\d+\Z/:

"123" =~ /\A[+\-]?\d+\Z/
#=> 0
"$$$$$" =~ /\A[+\-]?\d+\Z/
#=> nil

answered Apr 25, 2016 at 17:10

Ilya

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1 Comment

Todd Over a year ago

Thanks for the reply. This does not explain why the second field, which does not have only_integer, exhibits the same exact behavior. I can type "string" into the second field, and it will just get set to nil and save, instead of failing to save and displaying an error.

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