15 lines
469 B
Ruby
15 lines
469 B
Ruby
class BackfillNoteSubscriptions < ActiveRecord::Migration[7.2]
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class NoteComment < ApplicationRecord; end
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class NoteSubscription < ApplicationRecord; end
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disable_ddl_transaction!
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def up
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attrs = %w[user_id note_id]
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NoteComment.in_batches(:of => 1000) do |note_comments|
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rows = note_comments.distinct.where.not(:author_id => nil).pluck(:author_id, :note_id)
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NoteSubscription.upsert_all(rows.map { |r| attrs.zip(r).to_h })
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end
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end
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end
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