mirror of https://github.com/mastodon/mastodon
50 lines
992 B
Ruby
50 lines
992 B
Ruby
# frozen_string_literal: true
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class AddIndexToIdentitiesUidProvider < ActiveRecord::Migration[7.0]
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disable_ddl_transaction!
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def up
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add_index_to_table
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rescue ActiveRecord::RecordNotUnique
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remove_duplicates_and_reindex
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end
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def down
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remove_index_from_table
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end
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private
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def remove_duplicates_and_reindex
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deduplicate_records
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reindex_records
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rescue ActiveRecord::RecordNotUnique
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retry
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end
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def reindex_records
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remove_index_from_table
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add_index_to_table
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end
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def add_index_to_table
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add_index :identities, [:uid, :provider], unique: true, algorithm: :concurrently
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end
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def remove_index_from_table
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remove_index :identities, [:uid, :provider]
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end
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def deduplicate_records
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safety_assured do
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execute <<~SQL.squish
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DELETE FROM identities
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WHERE id NOT IN (
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SELECT DISTINCT ON(uid, provider) id FROM identities
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ORDER BY uid, provider, id ASC
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)
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SQL
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end
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end
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end
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