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30 lines
984 B
Ruby
30 lines
984 B
Ruby
# frozen_string_literal: true
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class UpdatePostReplyIndexes < ActiveRecord::Migration[6.0]
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# Adding and removing indexes concurrently doesn't work within transaction.
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# It also needs existence checks for indexes in case the migration fails and needs to run again.
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disable_ddl_transaction!
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def up
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if !index_exists?(:post_replies, [:post_id, :reply_post_id])
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add_index :post_replies, [:post_id, :reply_post_id], unique: true, algorithm: :concurrently
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end
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if !index_exists?(:post_replies, [:reply_post_id])
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add_index :post_replies, [:reply_post_id], algorithm: :concurrently
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end
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if index_exists?(:post_replies, [:post_id, :reply_id])
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remove_index :post_replies, column: [:post_id, :reply_id], algorithm: :concurrently
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end
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if index_exists?(:post_replies, [:reply_id])
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remove_index :post_replies, column: [:reply_id], algorithm: :concurrently
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end
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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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