Passing stream results into a secondary stream's API path

I have three streams.

accounts
|=statement list
|==statements

A field from accounts is used to populate the path for statement list. Two fields from statement list are needed to populate the path for statements.

I have the first two streams working the way I want by defining a class-specific stream slice.

class AccountRelatedStream(ParentClassStream, ABC):    
    
    def stream_slices(
        self, sync_mode: SyncMode, cursor_field: List[str] = None, stream_state: Mapping[str, Any] = None
    ) -> Iterable[Optional[Mapping[str, Any]]]:
        accounts_stream = Accounts(authenticator=self.authenticator)
        for record in accounts_stream.read_records(sync_mode=SyncMode.full_refresh):
            yield {"account_id": record["account"]["account_id"]}

I thought I could do something similar for the last stream, but this isn’t working.

class StatementRelatedStream(ParentClassStream, ABC):    
    
    def stream_slices(
        self, sync_mode: SyncMode, cursor_field: List[str] = None, stream_state: Mapping[str, Any] = None
    ) -> Iterable[Optional[Mapping[str, Any]]]:
        statements_stream = StatementsList(authenticator=self.authenticator)
        for record in statements_stream.read_records(sync_mode=SyncMode.full_refresh):
            yield {"account_id": record["account_id"],"statement_id":record["statement_id"]}

I get an TypeError: 'NoneType' object is not subscriptable error. Any ideas?

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Hey is this a custom connector? If so can you share the cdk version for it?

Hey @harshith – it is a custom connector. I’m on CDK version 0.1.56.

Got it. It will be helpful if you can share the repo URL so that we can take a look at the code. Is it possible?

Sure thing, here it is. source-canopy is the custom connector.

Hey could you also share the screenshot of the error? Or copy the complete error log here