Conditional validation if another validation is valid [duplicate]

Question

I have the following three validations in a model in my rails app:

  validates_presence_of :reset_code, message: 'Please enter your reset code'
  validates_length_of :reset_code, is: 4, message: 'Your reset code should be 4 digits'
  validates_format_of :reset_code, with: /\A[0-9]{4}\z/, message: 'Please enter a valid reset code'

I only want to fire the second and third validations if the first is valid (as there is no point in telling the user the reset code isn't the correct length or format if they haven't entered one at all).

So something along the lines of:

validates_length_of :reset_code, is: 4, message: 'Your reset code should be 4 digits', :if => :reset_code.present?

user229044 · Accepted Answer · 2016-06-28 15:34:11Z

1

You should use new the new validation syntax, and provide a simple if: condition:

  validates :reset_code, length: { is: 4 },
    message: 'Your reset code should be 4 digits',
    if: -> { reset_code.present? }

  validates :reset_code, format: { with: /\A[0-9]{4}\z/ },
    message: 'Please enter a valid reset code',
    if: -> { reset_code.present? }

answered Jun 28, 2016 at 15:34

user229044♦

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6 Comments

Cameron Over a year ago

Can I achieve this with the older syntax?

user229044 Over a year ago

@Cameron api.rubyonrails.org/classes/ActiveModel/Validations/…

Cameron Over a year ago

Ah, it was because I had used :if => rather than if: ->

Cameron Over a year ago

What if I want the third to only fire if the first and second have passed? So instead of checking if it is present, check the validation itself is valid?

Cameron Over a year ago

Could I just do: if: -> { validates_length_of.valid? }

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