Clarification on conditional updates of sub-attributes

[sarflux]

would there be an easy way to update attributes based on conditions on the sub attributes?

For example if my Dyntastic object looks like so

class Foo(Dyntastic):
    __table_name__ = getenv("TABLE_NAME", None)
    __hash_key__ = getenv("PARTITION_KEY", None)
    pk: str= Field()
    data: Data | None = Field(None)

class Data(BaseModel):
    id: str| None = Field(None)

and I would like to update my data field with some arbitrary condition on my data.id field:

foo = Foo(pk="some_pk")
data_dump = Data(id="bar")
foo.update(A.data.set(data_dump), condition = (A.data.not_exists() | A.data.id.ne("foo") ) 

[nayaverdier]

It might be possible using A("data.id") to reference nested fields. Give that a try and see if it works for your use case.

[sarflux]

It seems to result in a no-op even if the condition is correct,

my condition statement is something like this (id is int now):

foo.update(A.data.set(data.model_dump(exclude_none=True)),
                    condition=(A("data.id").lt(data.id)),require_condition=True,
                    refresh=False)

I don't really know if I'm still doing something wrong, maybe Attr is not being set correctly for nested fields?

[nayaverdier]

I was able to confirm that this simple case works:

item.update(A("my_dict.a").set(100), condition=A("my_dict.a") == 1)
assert item.my_dict["a"] == 100

What behavior are you seeing? Since you have require_condition=True, do you see a ConditionException?