45 lines
963 B
Ruby
45 lines
963 B
Ruby
# frozen_string_literal: true
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class MoveTopicRevisionsToPostRevisions < ActiveRecord::Migration[4.2]
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def up
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execute <<SQL
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INSERT INTO post_revisions(user_id, post_id, modifications, number, created_at, updated_at)
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SELECT tr.user_id, p.id, tr.modifications, tr.number, tr.created_at, tr.updated_at
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FROM topic_revisions tr
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JOIN topics t ON t.id = tr.topic_id
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JOIN posts p ON p.topic_id = t.id AND p.post_number = 1
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SQL
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execute <<SQL
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UPDATE post_revisions r SET number = 2 + (
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SELECT COUNT(*) FROM post_revisions r2
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WHERE r2.post_id = r.post_id AND r2.created_at < r.created_at
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)
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SQL
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execute <<SQL
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UPDATE posts p SET version = 1 + (
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SELECT COUNT(*) FROM post_revisions r
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WHERE r.post_id = p.id
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)
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SQL
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execute <<SQL
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DROP TABLE topic_revisions
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SQL
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end
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def down
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# strictly, we could reverse this, but not implemented
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raise ActiveRecord::IrreversibleMigration
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end
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end
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