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: 20180607144046_initialize_items.rb
    path of file: ./repos/human-essentials/db/migrate
    
    the code of the file until where you have to start completion: # `CanonicalItem` is later renamed to `BaseItem`. It was a bad choice to
# do it this way in a migration, but here we are. The database doesn't
# yet know about the BaseItem name change, but the codebase does.
class CanonicalItem < ApplicationRe
    
  def up
    ci = CanonicalItem.find_or_initialize_by(name: "Other") do |ci|
      ci.category = "Miscellaneous"
    end
    # Skipping validations because requirements about `partner_key` cause problems if we don't
    ci.save(validate: false)
    Item.where(canonical_item_id: nil).update_all(canonical_item_id: ci.id)
    CanonicalItem.reset_column_information
    Item.reset_column_information
  end
  
  def down
  end
end