Problem of Customized child classes due to AAS Constraint 108 in SEList

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#47 opened on Jan 31, 2023 4 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 5/5
Estimated time: Over a week
Newbie friendliness: 30/100

Issue type: Bug
Clarity: Needs clarification
Activity status: Stale
Tech stack: python
Domain: backend

Research direction

Start with _check_constraints in SubmodelElementList and _submodel_element_list_to_json in json_serialization.py, then inspect the KEY_TYPES_CLASSES mapping. Determine how customized child classes should satisfy the constraint and serialization paths; the work is done when the chosen behavior is consistent for both cases.

Written by the indexing model from the issue text.

Description

sdk

The Constraint AASd-108 says: All first level child elements in a SubmodelElementList shall have the same
submodel element type as specified in SubmodelElementList/typeValueListElement.

The _check_constraints method in SubmodelElementList raises Exception if the child element in SubmodelElementList is not of the same Class as it is specified in typeValueListElement.

So if I define my SDK for a specific Submodel and define classes for it (e.g. SpecialProperty) which inherit from e.g. Property class, i get Errors:

I set SubmodelElementList/typeValueListElement to Property
I add to SubmodelElementList my SpecialProperty object
I get error from _check_constraints , because SpecialProperty!=Property .
If I set SubmodelElementList/typeValueListElement to SpecialProperty , I get error from _submodel_element_list_to_json in json_serialization.py because SpecialProperty class is not in KEY_TYPES_CLASSES dict

What are possible solutions here?

Dominant language: Python
Stars: 102
Forks: 52
Avg merge: 20d 17h
Merged PRs (30d): 1

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