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# File 'lib/backframe/activerecord/acts_as_orderable.rb', line 13
def acts_as_orderable(field, args = {})
class_eval " validates_presence_of :\#{field}\n\n before_validation :set_\#{field}, :on => :create\n after_destroy :reorder_\#{field}\n\n default_scope -> { order(:\#{field} => :asc) }\n\n def set_\#{field}\n self.\#{field} ||= (self.\#{args[:on]}.\#{self.name.tableize}.any?) ? self.\#{args[:on]}.\#{self.name.tableize}.maximum(:\#{field}) + 1 : 0\n end\n\n def reorder_\#{field}\n self.\#{args[:on]}.\#{self.name.tableize}.order(:\#{field} => :asc).each_with_index do |item, index|\n item.update_column(:\#{field}, index)\n end\n end\n\n EOV\n\nend\n"
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