Rails validations if condition

Question

I need your help validating a simple Rails model.

First i want to check if the user filled all input-fields:

class Test < ActiveRecord::Base

   validates :firstname, :lastname, :firstvalue, :secondvalue, presence: true

   [...]

I also want to check if the :secondvalue param is bigger than :firstvalue.

Adding

validate :biggerThan

def biggerThan

    if self.secondvalue < self.firstvalue

        errors.add(:secondvalue, "must be bigger than First")

    end
end

Well this works, but only if all other fields are filled! Creating a new Entry leaving all fields blank i am getting an undefined method <' for nil:NilClass.

Could you help me?

Rajdeep Singh · Accepted Answer · 2015-03-12 11:21:52Z

2

You can do this

validate :biggerThan, if: Proc.new{ |test| test.firstvalue.present? and test.secondvalue.present? }

It would be good if you add numericality validations also

validates :firstvalue, numericality: true
validates :secondvalue, numericality: true

edited Mar 12, 2015 at 11:21

answered Mar 12, 2015 at 11:14

Rajdeep Singh

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