We're using the Model Graphic API endpoint in Repository API Technical Introduction. It returns the PNGHash value, Kind="MODELGRAPHIC", and ItemGuid.
Is there way to get any other meta-data about the image specifically last changed datetime?
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You would have to read the attribute "Last Update" of the model. But note, that the Last Update date of the model would also change if you only changed model attributes, leaving the model graphic unchanged. The model graphic is no separate object from the model with all its attributes. It's only generated on-the-fly from the model content, when you request it. On the other hand object attributes shown in the model could change without the Last Update date of the model being updated. Only the Last Update of the changed object would change.
M. Zschuckelt on
You would have to read the attribute "Last Update" of the model. But note, that the Last Update date of the model would also change if you only changed model attributes, leaving the model graphic unchanged. The model graphic is no separate object from the model with all its attributes. It's only generated on-the-fly from the model content, when you request it. On the other hand object attributes shown in the model could change without the Last Update date of the model being updated. Only the Last Update of the changed object would change.