I would like to have an item automatically destroyed when a necessary
association has been removed via a call to a `remove_association` method.
I have achieved this right now with an extra bit of markup that looks like
this:
```ruby
class Group < Sequel::Model
one_to_many :members, remover: ->(member) { member.destroy }`
end
```
this seems to work, and any `Member` instance is destroyed when I call
`remove_member(member)` on a `Group` instance. but I'm curious if this is
an appropriate and best way of doing this. It'd be great if there was an
option/plugin that would do this automatically when the db schema migration
specifies something like:
```ruby
create_table(:members) {
foreign_key :group_id, :groups, null: false, on_delete: :cascade
}
```
thanks for any help and apologies if I've missed this in the documentation
or am conceptually being stupid :)
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