To use Pydantic instances as request and/or response of a REST service endpoint
you must:

* Define your Pydantic classes;
* Provides the information required to the ``odoo.addons.base_rest.restapi.method`` decorator;


.. code-block:: python


    from odoo.addons.base_rest import restapi
    from odoo.addons.component.core import Component
    from odoo.addons.pydantic.models import BaseModel

    class PingMessage(BaseModel):
        message: str


    class PingService(Component):
        _inherit = 'base.rest.service'
        _name = 'ping.service'
        _usage = 'ping'
        _collection = 'my_module.services'


        @restapi.method(
            [(["/pong"], "GET")],
            input_param=restapi.PydanticModel(PingMessage),
            output_param=restapi.PydanticModel(PingMessage),
            auth="public",
        )
        def pong(self, ping_message):
            return PingMessage(message = "Received: " + ping_message.message)