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: 20240304070105_create_active_storage_variant_records.active_storage.rb
    path of file: ./repos/polaris_view_components/demo/db/migrate
    
    the code of the file until where you have to start completion: # This migration comes from active_storage (originally 2019120603041
    
  def change
    return unless table_exists?(:active_storage_blobs)

    # Use Active Record's configured type for primary key
    create_table :active_storage_variant_records, id: primary_key_type, if_not_exists: true do |t|
      t.belongs_to :blob, null: false, index: false, type: blobs_primary_key_type
      t.string :variation_digest, null: false

      t.index %i[ blob_id variation_digest ], name: "index_active_storage_variant_records_uniqueness", unique: true
      t.foreign_key :active_storage_blobs, column: :blob_id
    end
  end