from django.db import models
from django_mongodb_backend.fields import ArrayField, EmbeddedModelField
from django_mongodb_backend.models import EmbeddedModel

class Skill(EmbeddedModel):
    skills = ArrayField(models.CharField(max_length=100), null=True, blank=True)

class MyModel(models.Model):
    name = models.CharField(max_length=20)
    skills = EmbeddedModelField(Skill)

    def __str__(self):
        return f"{self.id}"

>>> from app.models import MyModel, Skill
>>> a = MyModel()                     
>>> a.name = "raghav"
>>> s = Skill()
>>> s.skills = ["python", "djnago", "html"]
>>> a.skills = s
>>> a.save()
>>> a
<MyModel: 68031a51f94dfbc27a06a715>
>>> b = MyModel()
>>> b.name = "madhav"
>>> r = Skill()
>>> r.skills = ["css", "js", "java", "python"]
>>> b.skills = r
>>> b.save()
>>> MyModel.objects.all()
<QuerySet [<MyModel: 68031a51f94dfbc27a06a715>, <MyModel: 68031a9df94dfbc27a06a716>]>

>>> MyModel.objects.filter(skills_skills_contains=["python"])
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "C:\Users\atrey\.conda\envs\django_env\Lib\site-packages\django\db\models\query.py", line 376, in __repr__
    data = list(self[: REPR_OUTPUT_SIZE + 1])
  File "C:\Users\atrey\.conda\envs\django_env\Lib\site-packages\django\db\models\query.py", line 400, in __iter__
    self._fetch_all()
    ~~~~~~~~~~~~~~~^^
  File "C:\Users\atrey\.conda\envs\django_env\Lib\site-packages\django\db\models\query.py", line 1928, in _fetch_all
    self._result_cache = list(self._iterable_class(self))
                         ~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\atrey\.conda\envs\django_env\Lib\site-packages\django\db\models\query.py", line 91, in __iter__
    results = compiler.execute_sql(
        chunked_fetch=self.chunked_fetch, chunk_size=self.chunk_size
    )
  File "C:\Users\atrey\.conda\envs\django_env\Lib\site-packages\django_mongodb_backend\compiler.py", line 245, in execute_sql
    query = self.build_query(
        # Avoid $project (columns=None) if unneeded.
    ...<2 lines>...
        else None
    )
  File "C:\Users\atrey\.conda\envs\django_env\Lib\site-packages\django_mongodb_backend\compiler.py", line 386, in build_query
    expr = where.as_mql(self, self.connection) if where else {}
           ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\atrey\.conda\envs\django_env\Lib\site-packages\django_mongodb_backend\query.py", line 268, in where_node
    mql = child.as_mql(compiler, connection)
  File "C:\Users\atrey\.conda\envs\django_env\Lib\site-packages\django_mongodb_backend\lookups.py", line 16, in builtin_lookup
    value = process_rhs(self, compiler, connection)
  File "C:\Users\atrey\.conda\envs\django_env\Lib\site-packages\django_mongodb_backend\query_utils.py", line 40, in process_rhs
    _, value = node.process_rhs(compiler, connection)
               ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\atrey\.conda\envs\django_env\Lib\site-packages\django\db\models\lookups.py", line 586, in process_rhs
    params[0] = self.param_pattern % connection.ops.prep_for_like_query(
                                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
        params[0]
        ^^^^^^^^^
    )
    ^
  File "C:\Users\atrey\.conda\envs\django_env\Lib\site-packages\django_mongodb_backend\operations.py", line 173, in prep_for_like_query
    return re.escape
           ~~~~~~~~~^^^
  File "C:\Users\atrey\.conda\envs\django_env\Lib\re_init_.py", line 312, in escape
    pattern = str(pattern, 'latin1')
TypeError: decoding to str: need a bytes-like object, list found