You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: 20171002133547_remove_poll_white_null_total_results.rb
    path of file: ./repos/consuldemocracy/db/migrate
    
    the code of the file until where you have to start completion: class RemovePollWhiteNullTotalResults < ActiveRecord::Migration[4.2]
  def up
    remove_index :poll_null_results, column: [:booth_assignment_id]
 
    
  def up
    remove_index :poll_null_results, column: [:booth_assignment_id]
    remove_index :poll_null_results, column: [:officer_assignment_id]

    remove_index :poll_white_results, column: [:booth_assignment_id]
    remove_index :poll_white_results, column: [:officer_assignment_id]

    remove_index :poll_total_results, column: [:booth_assignment_id]
    remove_index :poll_total_results, column: [:officer_assignment_id]

    drop_table :poll_null_results
    drop_table :poll_total_results
    drop_table :poll_white_results
  end