23 lines
600 B
Ruby
23 lines
600 B
Ruby
# frozen_string_literal: true
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class UpdateThreadReplyCounts < ActiveRecord::Migration[7.0]
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def up
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DB.exec <<~SQL
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UPDATE chat_threads threads
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SET replies_count = subquery.replies_count
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FROM (
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SELECT COUNT(*) - 1 AS replies_count, thread_id
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FROM chat_messages
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WHERE chat_messages.deleted_at IS NULL AND thread_id IS NOT NULL
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GROUP BY thread_id
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) subquery
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WHERE threads.id = subquery.thread_id
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AND subquery.replies_count != threads.replies_count
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SQL
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end
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def down
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raise ActiveRecord::IrreversibleMigration
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end
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end
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