CODEWITHSUNDEEP
ruby-on-railsactiverecord
lost9123193
lost9123193

Reputation: 11040

How to Validate Field in Rails, Active:Model::Validator

I'm trying to write a validator that will only update the price of a book if the selling status is inactive. 

# frozen_string_literal: true

class BookPriceValidator < ActiveModel::Validator
  def validate(record)

    record.errors[:price] << "can't change price on book" if record.selling == "active"
  end
end

The problem I'm running into right now is that the error gets called even when the book price is not updated. How can i call this error only when the :price field has actually changed?

Upvotes: 0

Views: 48

Answers (1)

engineersmnky
engineersmnky

Reputation: 29478

You can change the condition to 

if record.price_changed? && record.selling == "active"`

ActiveModel::Dirty keeps track of the unpersisted changes made to an ActiveRecord object and adds convenience methods for each attribute as [attribute_name]_changed?. So all you have to do is check if the price changed along with your current condition.

Upvotes: 1

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