How to determine if a field has changed in a Django modelform

Question

I was surprised that this was difficult to do. However I came up with this, which seems to work at least for my simple case. Can anyone recommend a better approach?

Answer 1

Extending on Airs's answer, for multiple fields:

In a scenario where you'd like to track changes for a list of fields ['field_a', 'field_b', 'field_c']

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If you'd like to check if any of those fields has changed:

any(x in myforminstance.changed_data for x in ['field_a', 'field_b', 'field_c'])

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If you'd like to check if all of those fields have changed:

all(x in myforminstance.changed_data for x in ['field_a', 'field_b', 'field_c'])