abandoned_trial_query.rb

require 'delegate'

class AbandonedTrialQuery < SimpleDelegator
  def initialize(relation = Account.scoped)
    super(relation.where(plan: nil, invites_count: 0))
  end
end

some_use.rb

old_accounts = Account.where("created_at < ?", 1.month.ago)
old_abandoned_trials = AbandonedTrialQuery.new(old_accounts)

old_abandoned_trials.find_each do |account|
  account.send_offer_for_support
end