Hello,
Do you think it could make sense to add an option to `has_one_attached`, so
that any previous attachment is automatically purged (or purged later) when
calling `attach`?
The syntax could be:
```
has_one_attached :attachment, previous_attachment: { :purge | :purge_later
| :restrict_with_error | :restrict_with_exception }
```
This follows the question posted here:
https://stackoverflow.com/questions/45870021/how-to-update-attachment-in-activestorage-rails-5-2/45933694#45933694
What do you think?
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