# File lib/mail/header.rb, line 143 def []=(name, value) name = dasherize(name) fn = name.downcase selected = select_field_for(fn) case # User wants to delete the field when !selected.blank? && value == nil fields.delete_if { |f| selected.include?(f) } # User wants to change the field when !selected.blank? && limited_field?(fn) selected.first.update(fn, value) # User wants to create the field else # Need to insert in correct order for trace fields self.fields << Field.new(name.to_s, value, charset) end end