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class Person < ActiveRecord::Base
attr_accessor :dont_set_name
 
def name
@name
end
 
def name=(attr)
@name = attr unless dont_set_name
end
end
 
a = Person.new
a.attributes = {name: 'George', dont_set_name: true}
a.name
#=> 'George'
 
a = Person.new
a.attributes = {dont_set_name: true, name: 'George'}
a.name
#=> nil
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