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In Cognite Data Fusion data models, instances (nodes and edges) are uniquely identified by their space and external ID.
To simplify the user experience, Pygen includes a parameter called default_instance_space. You can set this parameter when generating a new SDK, allowing you to work with nodes and edges without specifying their space, as long as all nodes and edges share the same instance space.
In earlier versions, if you didn’t specify the default_instance_space, Pygen would default to using the same space as the data model. Now, Pygen generates an SDK that requires users to specify the space when creating, retrieving, and deleting nodes and edges.
The reason for this change is that having the schema (data model, views, containers) and data (nodes and edges) in the same space is considered an anti-pattern. Governance of a data model should be in a separate space, while data ingestion and consumption should occur in different spaces, typically one space per data source.