validação de esquema de campo django postgresql json

import django
from django.core.validators import BaseValidator
import jsonschema
    

class JSONSchemaValidator(BaseValidator):
    def compare(self, value, schema):
        try:
            jsonschema.validate(value, schema)
        except jsonschema.exceptions.ValidationError:
            raise django.core.exceptions.ValidationError(
                '%(value)s failed JSON schema check', params={'value': value}
            )

from django.db import models

from project.validators import JSONSchemaValidator

MY_JSON_FIELD_SCHEMA = {
    'schema': 'http://json-schema.org/draft-07/schema#',
    'type': 'object',
    'properties': {
        'my_key': {
            'type': 'string'
        }
    },
    'required': ['my_key']
}

class MyModel(models.Model):
    my_json_field = models.JSONField(
        default=dict,
        validators=[JSONSchemaValidator(limit_value=MY_JSON_FIELD_SCHEMA)]
    )