encrypt_attribute

# File activerecord/lib/active_record/encryption/encryptable_record.rb, line 84
          def encrypt_attribute(name, key_provider: nil, key: nil, deterministic: false, support_unencrypted_data: nil, downcase: false, ignore_case: false, previous: [], **context_properties)
            encrypted_attributes << name.to_sym

            attribute name do |cast_type|
              scheme = scheme_for key_provider: key_provider, key: key, deterministic: deterministic, support_unencrypted_data: support_unencrypted_data,                  downcase: downcase, ignore_case: ignore_case, previous: previous, **context_properties

              ActiveRecord::Encryption::EncryptedAttributeType.new(scheme: scheme, cast_type: cast_type, default: columns_hash[name.to_s]&.default)
            end

            preserve_original_encrypted(name) if ignore_case
            ActiveRecord::Encryption.encrypted_attribute_was_declared(self, name)
          end