The following code worked in the python API for Grakn 1.5.9:
concept_type = next(iterator_conceptMap).get("x")
concepts_sub = concept_type.subs()
since updating Grakn and the Python API to 1.8.1, the code produces the error
AttributeError: 'AttributeType' object has no attribute 'subs'
(and the same error for EntityTypes, RelationTypes and Roles)
The same error happens for other methods: attributes(), keys() .. (haven't tested all).
I have checked that concept_type.is_type() returns True.
Not sure if relevant, but the error occurred after substituting the collect_concepts() method throughout the app using the above syntax or list comprehensions, given that the method had been removed (see the Pull Request).
The relevant concept API docs haven't changed.
What is going wrong?
The docs relevant to this question are found here: https://dev.grakn.ai/docs/concept-api/overview
Before the Grakn clients version 1.8.0, concepts always retained a connection to the server directly. This enabled users to do calls into the Grakn server using using methods like subs() and keys().
As of >1.8.0, client-side concepts are either Local concepts or Remote concepts:
Local concepts are simple value objects that retain Id, Label, Type, Value (for attributes) and other state they directly contain. Clients return Local in general from queries and other operations.Remote concepts are obtained from Local concepts by passing a transaction to the concept using concept.asRemote(tx). This re-enables them to connect to the server as in the older versions of the grakn clients.This change was made to ensure users are aware which operations are potentially expensive and require trips over the network, and which are fast and operate on local values only.