fix: add extractor back for capability

https://jira.railsc.ru/browse/USERS-244

lib/treasury/fields/extractor.rb

@@ -0,0 +1,23 @@
+module Treasury
+  module Fields
+    # Public: Модуль добавляет классу метод extract_object, подходит для источников и полей денормализации.
+    #
+    # Deprecated: For extract object use Apress::Sources::ExtractObject module
+    #
+    # Example:
+    #
+    #   class Field
+    #     extend ::Treasury::Fields::Extractor
+    #     extract_attribute_name :user
+    #   end
+    #
+    #   Field.extract_object(object: {user_id: 1})
+    #     => 1
+    module Extractor
+      def self.extended(base)
+        warn "[DEPRECATION] Please use `extend Apress::Sources::ExtractObject` instead Treasury::Fields::Extractor"
+        base.extend(Apress::Sources::ExtractObject)
+      end
+    end
+  end
+end

spec/lib/treasury/fields/extractor_spec.rb

@@ -0,0 +1,13 @@
+RSpec.describe Treasury::Fields::Extractor do
+  let(:class_with_extractor) do
+    Class.new do
+      extend Treasury::Fields::Extractor
+
+      extract_attribute_name :user
+    end
+  end
+
+  describe '.extract_object' do
+    it { expect(class_with_extractor.extract_user(object: {user_id: 1})).to eq 1 }
+  end
+end