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: 20120822130340_setup_models.rb
    path of file: ./repos/hitobito/db/migrate
    
    the code of the file until where you have to start completion: # encoding: utf-8

#  Copyright (c) 2012-2013, Jungwacht Blauring Schweiz. This file is part of
#  hitobito and licensed under the Affero General Public License version 3
#  or later. See the COPYING file at the top-level directory or at
#  https://github.com/hitobito/hitobito.

class SetupModels < ActiveRecord::Migration[4.2]
  def change
    create_table :people do |t|
      t.string :first_name
      t.string :last_name
      t.string :company_name
      t.string :nickname
      t.boolean :company, null: false, default: false

      t.string :email

      t.string :address, limit: 1024
      t.integer :zip_code
      t.string :town
      t.string :country

      t.string :gender, limit: 1
      t.date :birthday

      t.text :additional_information

      t.boolean :contact_data_visible, null: false, default: false
      t.timestamps
    end


    create_
    
  def change
    create_table :people do |t|
      t.string :first_name
      t.string :last_name
      t.string :company_name
      t.string :nickname
      t.boolean :company, null: false, default: false

      t.string :email

      t.string :address, limit: 1024
      t.integer :zip_code
      t.string :town
      t.string :country

      t.string :gender, limit: 1
      t.date :birthday

      t.text :additional_information

      t.boolean :contact_data_visible, null: false, default: false
      t.timestamps
    end


    create_table :groups do |t|
      t.integer :parent_id
      t.integer :lft
      t.integer :rgt

      t.string :name, null: false
      t.string :short_name, limit: 31
      t.string :type, null: false

      t.string :email
      t.string :address, limit: 1024
      t.integer :zip_code
      t.string :town
      t.string :country

      t.belongs_to :contact

      t.timestamps
      t.datetime :deleted_at
    end
    add_index :groups, [:lft, :rgt]
    add_index :groups, :parent_id


    create_table :roles do |t|
      t.belongs_to :person, null: false
      t.belongs_to :group, null: false

      t.string :type, null: false
      t.string :label

      t.timestamps
      t.datetime :deleted_at
    end
    add_index :roles, [:person_id, :group_id]


    create_table :phone_numbers do |t|
      t.belongs_to :contactable, polymorphic: true, null: false
      t.string :number, null: false
      t.string :label
      t.boolean :public, null: false, default: true
    end
    add_index :phone_numbers, [:contactable_id, :contactable_type]


    create_table :social_accounts do |t|
      t.belongs_to :contactable, polymorphic: true, null: false
      t.string :name, null: false
      t.string :label
      t.boolean :public, null: false, default: true
    end
    add_index :social_accounts, [:contactable_id, :contactable_type]

  end