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22208836c5
We don't need no stinkin' denormalization! This commit ignores the topic_id column on bookmarks, to be deleted at a later date. We don't really need this column and it's better to rely on the post.topic_id as the canonical topic_id for bookmarks, then we don't need to remember to update both columns if the bookmarked post moves to another topic.
63 lines
2.3 KiB
Ruby
63 lines
2.3 KiB
Ruby
# frozen_string_literal: true
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require_dependency "rake_helpers"
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##
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# This will create records in the new bookmarks table from PostAction
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# records. The task is idempotent, it will not create additional bookmark
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# records for PostActions that have already been created in the new table.
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# You can provide a sync_limit for a smaller batch run.
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#
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desc "migrates old PostAction bookmarks to the new Bookmark model & table"
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task "bookmarks:sync_to_table" => :environment do |_t, args|
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bookmarks_to_create = []
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loop do
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# post action type id 1 is :bookmark. we do not need to OFFSET here for
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# paging because the WHERE bookmarks.id IS NULL clause handles this effectively,
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# because we do not get bookmarks back that have already been inserted
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post_action_bookmarks = DB.query(
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<<~SQL, type_id: 1
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SELECT post_actions.id, post_actions.post_id, posts.topic_id, post_actions.user_id
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FROM post_actions
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INNER JOIN posts ON posts.id = post_actions.post_id
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LEFT JOIN bookmarks ON bookmarks.post_id = post_actions.post_id AND bookmarks.user_id = post_actions.user_id
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INNER JOIN topics ON topics.id = posts.topic_id
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INNER JOIN users ON users.id = post_actions.user_id
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WHERE bookmarks.id IS NULL AND post_action_type_id = :type_id AND post_actions.deleted_at IS NULL AND posts.deleted_at IS NULL
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LIMIT 2000
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SQL
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)
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break if post_action_bookmarks.count.zero?
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post_action_bookmarks.each do |pab|
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now = Time.zone.now
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bookmarks_to_create << "(#{pab.post_id}, #{pab.user_id}, '#{now}', '#{now}')"
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end
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create_bookmarks(bookmarks_to_create)
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bookmarks_to_create = []
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end # loop
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puts "Bookmark creation complete!"
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end
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def create_bookmarks(bookmarks_to_create)
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return if bookmarks_to_create.empty?
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# this will ignore conflicts in the bookmarks table so
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# if the user already has a post bookmarked in the new way,
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# then we don't error and keep on truckin'
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#
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# we shouldn't have duplicates here at any rate because of
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# the above LEFT JOIN but best to be safe knowing this
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# won't blow up
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#
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DB.exec(
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<<~SQL
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INSERT INTO bookmarks (post_id, user_id, created_at, updated_at)
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VALUES #{bookmarks_to_create.join(",\n")}
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ON CONFLICT DO NOTHING
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SQL
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)
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end
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