removing a bunch of mongo attributes in one hit #L19

nuke-attrs.rb

class AddPageFields < Mongoid::Migration
  def self.up
    Account.all.each do |account|
      account.pages.each do |page|
        page.update_attributes!(
          :callout => Account::Page::Defaults.callout,
          :phone => Account::Page::Defaults.phone,
          :email => Account::Page::Defaults.email
        )
      end
    end
  end

  def self.down
    query = {}
    update = {'$unset' => {'pages.email' => true, 'pages.phone' => true, 'pages.callout' => true}}
    opts = {'safe' => true}

    Account.collection.update(query, update, opts)  ### <- RAWK

  end
end

I never liked attributes to begin with ;)

;-) i've made mistakes with $set/$unset methodologies in the past when i wanted to query like : '$exists' => {:root => true} because $exists is always a table scan. in this case, of course, we're just rolling back a schema modification, but i thought i'd mention is since '$unset' often is paired with '$exists' in code.