Do not revalidate encrypted attribute with current encrypted_type

Author: iamradioactive

activerecord/lib/active_record/encryption/extended_deterministic_uniqueness_validator.rb

@@ -14,7 +14,7 @@ def validate_each(record, attribute, value)
           klass = record.class
           if klass.deterministic_encrypted_attributes&.include?(attribute)
             encrypted_type = klass.type_for_attribute(attribute)
-            [ encrypted_type, *encrypted_type.previous_types ].each do |type|
+            [ *encrypted_type.previous_types ].each do |type|
               encrypted_value = type.serialize(value)
               ActiveRecord::Encryption.without_encryption do
                 super(record, attribute, encrypted_value)

activerecord/test/cases/encryption/uniqueness_validations_test.rb

@@ -38,4 +38,11 @@ class ActiveRecord::Encryption::UniquenessValidationsTest < ActiveRecord::Encryp
       OldEncryptionBook.create! name: "DUNE"
     end
   end
+
+  test "uniqueness validation does not revalidate the attribute with current encryption type" do
+    EncryptedBookWithUniquenessValidation.create!(name: "dune")
+    record = EncryptedBookWithUniquenessValidation.create(name: "dune")
+
+    assert_equal record.errors.count, 1
+  end
 end

activerecord/test/models/book_encrypted.rb

@@ -10,6 +10,13 @@ class EncryptedBook < ActiveRecord::Base
   encrypts :name, deterministic: true
 end
 
+class EncryptedBookWithUniquenessValidation < ActiveRecord::Base
+  self.table_name = "encrypted_books"
+
+  validates :name, uniqueness: true
+  encrypts :name, deterministic: true
+end
+
 class EncryptedBookWithDowncaseName < ActiveRecord::Base
   self.table_name = "encrypted_books"