Validation Does Not Work with Multiple Encryption Scheme

[aveedibya]

Steps to reproduce

Uniqueness validation with multiple encryption scheme does not work. The uniqueness validation is skipped if the field is set up with current deterministic encryption scheme and previously non-deterministic encryption scheme. Example model class shown below:

  class UserSensitiveTable < ApplicationRecord
   
      ...
      
      validates :sensitive_field, uniqueness: true
      encrypts :sensitive_field, deterministic: true, previous: { deterministic: false }
    
      ...
  
  end

Expected behavior

Records with a duplicate sensitive field should not be created.

Actual behavior

Multiple records can be created for the sensitive_field even though the uniqueness validation is added for this field.

System configuration

Rails 7.0.8.1
Ruby 3.1.2