Djongo ArrayField 'Item' is not subscriptable - django

Question

I have 2 models in my django project. DB is mongoDB and I use Djongo.
Here are the models:
class Item(models.Model):
item_id = models.IntegerField(primary_key=True)
item_name = models.CharField(max_length=30)
def __str__(self):
return f'<{self.item_name}>'
class Items(models.Model):
items_id = models.IntegerField(primary_key=True)
inventory = models.ArrayField(model_container=Item,)
neutral_item = models.EmbeddedField(model_container=Item,)
buffs = models.ArrayField(model_container=Item,)
def __str__(self):
return f'<{self.inventory}, {self.neutral_item}>'
When I do:
item = Item(item_name='Helmet')
items = Items(inventory=[item])
I am getting this TypeError:
'Item' object is not subscriptable
What is wrong?
Whole error message:
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "/Users/georgii/PycharmProjects/custom_hero_chaos/venv/lib/python3.8/site-packages/django/db/models/base.py", line 745, in save
self.save_base(using=using, force_insert=force_insert,
File "/Users/georgii/PycharmProjects/custom_hero_chaos/venv/lib/python3.8/site-packages/django/db/models/base.py", line 782, in save_base
updated = self._save_table(
File "/Users/georgii/PycharmProjects/custom_hero_chaos/venv/lib/python3.8/site-packages/django/db/models/base.py", line 887, in _save_table
results = self._do_insert(cls._base_manager, using, fields, returning_fields, raw)
File "/Users/georgii/PycharmProjects/custom_hero_chaos/venv/lib/python3.8/site-packages/django/db/models/base.py", line 924, in _do_insert
return manager._insert(
File "/Users/georgii/PycharmProjects/custom_hero_chaos/venv/lib/python3.8/site-packages/django/db/models/manager.py", line 82, in manager_method
return getattr(self.get_queryset(), name)(*args, **kwargs)
File "/Users/georgii/PycharmProjects/custom_hero_chaos/venv/lib/python3.8/site-packages/django/db/models/query.py", line 1204, in _insert
return query.get_compiler(using=using).execute_sql(returning_fields)
File "/Users/georgii/PycharmProjects/custom_hero_chaos/venv/lib/python3.8/site-packages/django/db/models/sql/compiler.py", line 1390, in execute_sql
for sql, params in self.as_sql():
File "/Users/georgii/PycharmProjects/custom_hero_chaos/venv/lib/python3.8/site-packages/django/db/models/sql/compiler.py", line 1333, in as_sql
value_rows = [
File "/Users/georgii/PycharmProjects/custom_hero_chaos/venv/lib/python3.8/site-packages/django/db/models/sql/compiler.py", line 1334, in <listcomp>
[self.prepare_value(field, self.pre_save_val(field, obj)) for field in fields]
File "/Users/georgii/PycharmProjects/custom_hero_chaos/venv/lib/python3.8/site-packages/django/db/models/sql/compiler.py", line 1334, in <listcomp>
[self.prepare_value(field, self.pre_save_val(field, obj)) for field in fields]
File "/Users/georgii/PycharmProjects/custom_hero_chaos/venv/lib/python3.8/site-packages/django/db/models/sql/compiler.py", line 1275, in prepare_value
value = field.get_db_prep_save(value, connection=self.connection)
File "/Users/georgii/PycharmProjects/custom_hero_chaos/venv/lib/python3.8/site-packages/djongo/models/fields.py", line 215, in get_db_prep_save
return self.get_prep_value(value)
File "/Users/georgii/PycharmProjects/custom_hero_chaos/venv/lib/python3.8/site-packages/djongo/models/fields.py", line 222, in get_prep_value
processed_value = self._value_thru_fields('get_prep_value',
File "/Users/georgii/PycharmProjects/custom_hero_chaos/venv/lib/python3.8/site-packages/djongo/models/fields.py", line 315, in _value_thru_fields
post_dict = super()._value_thru_fields(func_name,
File "/Users/georgii/PycharmProjects/custom_hero_chaos/venv/lib/python3.8/site-packages/djongo/models/fields.py", line 145, in _value_thru_fields
field_value = value[field.attname]
TypeError: 'Item' object is not subscriptable

Answer 1

According to the Djongo docs for ArrayField you should instantiate like this:
entry = Entry()
entry.authors = [{'name': 'John', 'email': 'john#mail.com'},
{'name': 'Paul', 'email': 'paul#mail.com'}]
entry.save()
So in your case, you would do this.
items = Items()
items.inventory = [
{'item_name': 'Helmet'}
]
items.save()