Model JSONField

CustomModel.py

import json

from django import forms
from django.db import models


class JsonField(models.TextField):

    # object ready to python
    def to_python(self, value):
        if value is None:
            return value
        if isinstance(value, dict):
            return value
        return json.dumps(value)

    # Original class field
    def get_internal_type(self):
        return 'TextField'

    # prepare value to show in front
    def from_db_value(self, value, expression, connection):
        if value is None:
            return value
        return json.loads(value)

    # prepare value to DB
    def get_prep_value(self, value):
        if isinstance(value, dict):
            return json.dumps(value)
        return value

    def value_to_string(self, obj):
        return json.dumps(obj)