Field List class provides an enhanced array that keeps a list of email fields in order. And allows you to insert new fields without having to worry about the order they will appear in.
# File lib/mail/field_list.rb, line 10 def <<( new_field ) current_entry = self.rindex(new_field) if current_entry self.insert((current_entry + 1), new_field) else insert_idx = -1 self.each_with_index do |item, idx| case item <=> new_field when -1 next when 0 next when 1 insert_idx = idx break end end insert(insert_idx, new_field) end end
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