model._string_constraints: don't overwrite existing attributes in case of a conflict #152
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Currently a string constraints decorator silently overwrites existing attributes in case of a naming conflict. This behavior is changed such that the decorator checks for existing attributes beforehand and raises an exception in case of a conflict.
Futhermore, tests for this behavior are added.
I noticed this problem when reviewing #149. There, the decorator for
Entity.global_asset_id
currently overwrites theglobal_asset_id
property, resulting in the constraints not being checked properly. A fix for this is currently in the making.