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class AddSearchVectorToPageTranslations < ActiveRecord::Migration[7.2]
def up
add_column :page_translations, :search_vector, :tsvector
execute <<~SQL
UPDATE page_translations
SET search_vector = to_tsvector(
'simple',
coalesce(title, '') || ' ' ||
coalesce(abstract, '') || ' ' ||
coalesce(body, '')
)
SQL
add_index :page_translations, :search_vector,
using: :gin,
name: 'index_page_translations_on_search_vector'
execute <<~SQL
CREATE OR REPLACE FUNCTION page_translations_search_vector_update()
RETURNS trigger AS $$
BEGIN
NEW.search_vector := to_tsvector(
'simple',
coalesce(NEW.title, '') || ' ' ||
coalesce(NEW.abstract, '') || ' ' ||
coalesce(NEW.body, '')
);
RETURN NEW;
END;
$$ LANGUAGE plpgsql;
CREATE TRIGGER page_translations_search_vector_trigger
BEFORE INSERT OR UPDATE ON page_translations
FOR EACH ROW EXECUTE PROCEDURE page_translations_search_vector_update();
SQL
end
def down
execute <<~SQL
DROP TRIGGER IF EXISTS page_translations_search_vector_trigger ON page_translations;
DROP FUNCTION IF EXISTS page_translations_search_vector_update();
SQL
remove_index :page_translations, name: 'index_page_translations_on_search_vector'
remove_column :page_translations, :search_vector
end
end
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