Calculated fields in form builder

Hi, I can't find the documentation section that describes how to do "calculated" fields in the form builder. I have a

FileUpload

FileUpload

field and I need to store some information about the file in the database, in my case audio length in milliseconds. What's the lifecycle function I can use to fill my

audio_length

audio_length

field based on the file upload? Do I have to do this by listening to a model created event, and fill the column after the row is added?

Calculated fields in form builder

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Calculated fields in form builder

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