# app.models
from django.db import models
from django_mongodb_backend.fields import EmbeddedModelField
from django_mongodb_backend.models import EmbeddedModel

class TestEmbeddedModel(EmbeddedModel):
    decimal_field = models.DecimalField(
        max_digits=9, decimal_places=6
    )


class TestModel(models.Model):
    embedded_field = EmbeddedModelField(TestEmbeddedModel)

>>> from paying.models import TestModel, TestEmbeddedModel
>>> embedded_object = TestEmbeddedModel(decimal_field=1)         
>>> TestModel.objects.create(embedded_field=embedded_object)     
<TestModel: TestModel object (6808fc0724a581fef9dd0ee6)>
>>> TestModel.objects.all()

Traceback (most recent call last):
  File "C:\Users\Денис\AppData\Local\Programs\Python\Python310\lib\site-packages\django\db\models\fields\__init__.py", line 1811, in to_python       
    decimal_value = decimal.Decimal(value)
TypeError: conversion from Decimal128 to Decimal is not supported

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "C:\Users\Денис\AppData\Local\Programs\Python\Python310\lib\site-packages\django\db\models\query.py", line 376, in __repr__
    data = list(self[: REPR_OUTPUT_SIZE + 1])
  File "C:\Users\Денис\AppData\Local\Programs\Python\Python310\lib\site-packages\django\db\models\query.py", line 400, in __iter__
    self._fetch_all()
  File "C:\Users\Денис\AppData\Local\Programs\Python\Python310\lib\site-packages\django\db\models\query.py", line 1928, in _fetch_all
    self._result_cache = list(self._iterable_class(self))
  File "C:\Users\Денис\AppData\Local\Programs\Python\Python310\lib\site-packages\django\db\models\query.py", line 123, in __iter__
    for row in compiler.results_iter(results):
  File "C:\Users\Денис\AppData\Local\Programs\Python\Python310\lib\site-packages\django\db\models\sql\compiler.py", line 1512, in apply_converters   
    value = converter(value, expression, connection)
  File "C:\Users\Денис\AppData\Local\Programs\Python\Python310\lib\site-packages\django_mongodb_backend\fields\embedded_model.py", line 79, in from_db_value
    return self.to_python(value)
  File "C:\Users\Денис\AppData\Local\Programs\Python\Python310\lib\site-packages\django_mongodb_backend\fields\embedded_model.py", line 91, in to_python
    **{
  File "C:\Users\Денис\AppData\Local\Programs\Python\Python310\lib\site-packages\django_mongodb_backend\fields\embedded_model.py", line 92, in <dictcomp>
    field.attname: field.to_python(value[field.attname])
  File "C:\Users\Денис\AppData\Local\Programs\Python\Python310\lib\site-packages\django\db\models\fields\__init__.py", line 1813, in to_python       
    raise exceptions.ValidationError(
django.core.exceptions.ValidationError: ['“1” value must be a decimal number.']