Unknown validator: 'InValidator' on Ruby on Rails

Question

I am following the official getting started guide of Ruby on Rails. The guide provides the following code to add status validation to the concern:

module Visible
  extend ActiveSupport::Concern

  included do
    VALID_STATUSES = ['public', 'private', 'archived']

    validates :status, in: VALID_STATUSES
  end

  def archived?
    status == 'archived'
  end
end

However I get the following error: Unknown validator: 'InValidator' on line validates :status, in: VALID_STATUSES. I am using Rails 6.1.0 and following the guide for this version exactly. What is the problem here?

Edit
I have done a small change to make it work: validates :status, inclusion: { in: VALID_STATUSES }. But I want to know why in is not working as in the guide.

user_13708583 · Answer

The guide seems to be wrong, your solution with changing it to inclusion: { in: [] } is correct.

There is already a fix merged in the Rails repository but seems not yet deployed.

To add some background information how this works, the implementation in Rails does instantiate the validator class which is called InclusionValidator.

Unknown validator: 'InValidator' on Ruby on Rails

1 Answers