[QUESTION] Update json field

I have a json field structured like this:

[{"fecha": "31-10-2020 16:00", "doctor": "5d2a1c29-21b9-4a02-846c-171ba65ba0ea", "paciente": {"code": "a4723719-fbd4-4d16-9470-97ea93c3c5dd", "conv": "sebastian muñoz"}}]

Is there a way of update a single attribute of the json field ?..I mean without making a query and extracting the attributes.

return await some_pydantic.from_queryset_single(SomeModel.get(id=id)) <—Not this

something like this…obviously field and attr are examples return await some_pydantic.from_queryset_single(SomeModel.update(id=id).field(jsonField).attr(fecha=‘New Date’))

[long2ice]

OK, this is postgres example:

from tortoise.expressions import F
from pypika.terms import Function

class JsonbSet(Function):
    def __init__(self, field: F, path: str, value: Any, create_if_missing: bool = False):
        super().__init__("jsonb_set", field, path, value, create_if_missing)

json = await JSONFields.create(data_default={"a": 1})
json.data_default = JsonbSet(F("data_default"), "{a}", '3') # in fact '3' is integer 
await json.save()

And the sql is

UPDATE "jsonfields" SET "data_default"=jsonb_set("data_default", '{a}', '3', false) WHERE "id" = 1

[Master-Y0da]

Ok…I get it. But still is really confusing implement this in tortoise…Could you please add an example ? https://www.postgresql.org/docs/12/functions-json.html

Thank you for your time and predisposition.