I've clearly go a lot of repetition in the following methods:

  def name=(value)
    write_attribute(:name, if [0,"0",""," "].include? value then nil
else value end)
  end
  def address=(value)
    write_attribute(:address, if [0,"0",""," "].include? value then nil
else value end)
  end
  def city=(value)
    write_attribute(:city, if [0,"0",""," "].include? value then nil
else value end)
  end

Can someone tell me the convention to DRY this code?  I'm wondering if I
use a lambda but am not quite sure that's the right path or how to do
that.

Thanks,
Bill
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