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@week_endings ||= Actual.get_week_endings(4.weeks.ago.to_date)
last = @week_endings.last.week_ending
6.times do |i|
...

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def self.valid?(key)
  !((h = find_by_key(key)).nil? || h.invitation_details_count >= h.total)
end

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def self.valid?(key)
  (h = find_by_key(key)).nil? || h.invitation_details_count >= h.total
end

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class UserMailer < ActionMailer::Base
  def signup_notification 
    Proc.new  do  |user|
...