jsonschemafield.py

import inspect
from jsonschema import (
    validate, 
    exceptions as jsonschema_exceptions
)

from django.core import exceptions
from django.contrib.postgres.fields import JSONField


class JSONSchemaField(JSONField):

    def __init__(self, *args, **kwargs):
        self.schema = kwargs.pop('schema', None)
        super().__init__(*args, **kwargs)

    @property
    def _schema_data(self):
        model_file = inspect.getfile(self.model)
        dirname = os.path.dirname(model_file)
        # schema file related to model.py path
        p = os.path.join(dirname, self.schema)
        with open(p, 'r') as file:
            return json.loads(file.read())

    def _validate_schema(self, value):

        # Disable validation when migrations are faked
        if self.model.__module__ == '__fake__':
            return True
        try:
            status = validate(value, self._schema_data)
        except jsonschema_exceptions.ValidationError as e:
            raise exceptions.ValidationError(e.message, code='invalid')
        return status

    def validate(self, value, model_instance):
        super().validate(value, model_instance)
        self._validate_schema(value)

    def pre_save(self, model_instance, add):
        value = super().pre_save(model_instance, add)
        if value and not self.null:
            self._validate_schema(value)
        return value

Which package is inspect?

I think it is from python:

import inspect

Because django inspect tell me that it doesn't have getfile method.

from django.utils import inspect

Which package is inspect?

I think it is from python:

import inspect

Because django inspect tell me that it doesn't have getfile method.

from django.utils import inspect

Yep. Its inspect from the standard library. Good catch!

I forked your gist to create a django validator instead of a JSONSchemaField:

https://gist.github.com/mrroot5/4a7413bc335c67db7ee3c0448d3cff31

Thanks a lot for your initial work :-)