gistfile1.rb

# okay

after_save :search_reindex, :if => lambda { |r|
  Searchable.enabled? &&
   r.changes.present? &&
  (r.search_indexed_fields & r.changes.keys.select {|k| r.changes[k]}.collect(&:to_sym)).any?
}

# tried to create Proc object without a block

after_save :search_reindex, :if => lambda do |r|
  Searchable.enabled? &&
   r.changes.present? &&
  (r.search_indexed_fields & r.changes.keys.select {|k| r.changes[k]}.collect(&:to_sym)).any?
end