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# frozen_string_literal: true
class AddTemporaryIndexForNotesWithMentions < ActiveRecord::Migration[5.2]
include Gitlab::Database::MigrationHelpers
disable_ddl_transaction!
INDEX_CONDITION = "note LIKE '%@%'::text"
INDEX_NAME = 'note_mentions_temp_index'
EPIC_MENTIONS_INDEX_NAME = 'epic_mentions_temp_index'
DESIGN_MENTIONS_INDEX_NAME = 'design_mentions_temp_index'
def up
# create temporary index for notes with mentions, may take well over 1h
add_concurrent_index(:notes, [:id, :noteable_type], where: INDEX_CONDITION, name: INDEX_NAME)
# cleanup previous temporary indexes, as we'll be usig the single one
remove_concurrent_index(:notes, :id, name: EPIC_MENTIONS_INDEX_NAME)
remove_concurrent_index(:notes, :id, name: DESIGN_MENTIONS_INDEX_NAME)
end
def down
remove_concurrent_index(:notes, :id, name: INDEX_NAME)
add_concurrent_index(:notes, :id, where: "#{INDEX_CONDITION} AND noteable_type='Epic'", name: EPIC_MENTIONS_INDEX_NAME)
add_concurrent_index(:notes, :id, where: "#{INDEX_CONDITION} AND noteable_type='DesignManagement::Design'", name: DESIGN_MENTIONS_INDEX_NAME)
end
end
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