.. _custom-metadata:

Custom Metadata in Tarantool
======================================================

It is often necessary to assign additional metadata to the objects extracted from images uploaded to the card index and now stored in the feature vector database.



.. rubric:: In this section:

.. contents::
   :local:
 

Customize Meta Fields of Face Objects
------------------------------------------

To assign custom meta fields to the face objects, do the following:

#. Prepare the list of custom meta fields to assign.
#. Open the ``/etc/findface-security/config.py`` configuration file. 

   .. code::

      sudo vi /etc/findface-security/config.py
      
#. In the ``FFSECURITY`` section, uncomment the ``CUSTOM_FIELDS`` -> ``face_object`` section and modify the exemplary content, considering the following:

   * ``field_name``: field's name;
   * ``type``: data type;
   * ``default``: field's default value. If a default value exceeds ‘1e14 – 1', use a string data type to specify it, for example, ``"123123.."`` instead of ``123123..``.

   .. code::

      FFSECURITY = {

      ...

          # -- Custom model fields --
          ...
          # Edit CUSTOM_FIELDS -> `face_object` section to customize face object fields.
          ...
          # 'CUSTOM_FIELDS': {
                ...
                'face_object': {
                    'items': [
                        {
                            "field_name": "tag_name_1",
                            "type": "string",
                            "default": "change_me"
                        },
                        {
                            "field_name": "tag_name_2",
                            "type": "uint",
                            "default": 123
                        },
                        {
                            "field_name": "tag_name_3",
                            "type": "bool",
                            "default": True
                        },
                    ]
                }
            },
      }


#. :ref:`Add the new meta fields <modify-schema>` to the feature vector database structure.  

#. Restart the ``findface-security`` service.

   .. code::

      sudo systemctl restart findface-security.service

   You can work with the new meta fields through :ref:`HTTP API <api>` using the ``objects/faces/`` methods. 



Customize Meta Fields of Body and Car Objects
-------------------------------------------------

Assigning custom meta fields to the body and car objects are similar to the faces. The only difference is that you will need to manually create the ``CUSTOM_FIELDS`` -> ``body_object`` and ``CUSTOM_FIELDS`` -> ``car_object`` sections. It is a good idea to duplicate the ``CUSTOM_FIELDS`` -> ``face_object`` section and use it as a starting point for further modifications.

.. code::

   FFSECURITY = {

   ...

       # -- Custom model fields --
       ...
       # Edit CUSTOM_FIELDS -> `face_object` section to customize face object fields.
       ...
       # 'CUSTOM_FIELDS': {
             ...
             'body_object': {
                 'items': [
                     {
                         "field_name": "tag_name_1",
                         "type": "string",
                         "default": "change_me"
                     },
                     {
                         "field_name": "tag_name_2",
                         "type": "uint",
                         "default": 123
                     },
                     {
                         "field_name": "tag_name_3",
                         "type": "bool",
                         "default": True
                     },
                 ]
             }
             'car_object': {
                 'items': [
                     {
                         "field_name": "tag_name_1",
                         "type": "string",
                         "default": "change_me"
                     },
                     {
                         "field_name": "tag_name_2",
                         "type": "uint",
                         "default": 123
                     },
                     {
                         "field_name": "tag_name_3",
                         "type": "bool",
                         "default": True
                     },
                 ]
             }
         },
   }


Similarly, you can work with the new meta fields using the ``objects/bodies/`` and ``objects/cars/`` methods of :ref:`HTTP API <api>`. 

.. seealso::
   To create custom tabs, fields, and filters in cards, refer to :ref:`custom-tabs`.