class PgSearch::Multisearch::Rebuilder

def sti_clause
  clause = ""
  if model.column_names.include? model.inheritance_column
    clause = "WHERE"
    clause = "#{clause} #{model.inheritance_column} IS NULL OR" if model.base_class == model
    clause = "#{clause} #{model.inheritance_column} = #{model_name}"
  end
  clause
end