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Closes https://github.com/TryGhost/Team/issues/1508 Refs https://github.com/TryGhost/Ghost/pull/14468 - Maps existing subscribers to the default newsletter A note on performance: We loop over the rows in a potentially large table (members) but I've minimised the impact by limiting the columns we fetch. The alternative is a raw SQL query like the one below: the SQL version takes ~0.9s vs ~1.1s for the migration (my laptop, ~30k members). The disadvantage of the raw SQL implementation is the approximation of the ObjectID (instead of a legit bson ID) which isn't sequential and may impact index size/performance. ```sql insert into members_newsletters (id, member_id, newsletter_id) select substr(replace(uuid(),'-',''),1,24), id, '62595dcbfad4e031d85d166f' from members where members.subscribed=true; ``` |
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