I've just found that the problem is related to my desired
field being M2M. Anyone know what is going on here? :(
My approach (and Matt's) works fine on a simple CharField field.
class Device(models.Model):
# ...
floor = models.CharField('Floor', max_length=10, blank=True)
# ...
Device : old floor:
Device : new floor: 444444
Device : old floor: 444444
Device : new floor: 5555555555
Device : old floor: 5555555555
Device : new floor: 22
Device : old floor: 22
Device : new floor:
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