How to import objects created from a class from one file to another?

tenant.rb

tenant.rb
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class Tenant
  attr_reader :nickname, :occupation
  attr_writer :nickname, :occupation

  def initialize f_name, l_name, born_on, gender
    @f_name = f_name
    @l_name = l_name
    @born_on = born_on
    @gender = gender
  end

  def full_name
    "#{@f_name} '#{@nickname}' #{@l_name}"
  end
end

tenant_1 = Tenant.new "Eric", "Rowing", "April 21st, 1972", "male"
tenant_1.nickname = "E"
tenant_1.occupation = "Lawyer"

tenant_2 = Tenant.new "Jake", "Daniels", "March 3rd, 1990", "male"
tenant_2.nickname = ""
tenant_2.occupation = "Carpenter"

tenant_3 = Tenant.new "Nancy", "Lee", "December 4th, 1988", "female"
tenant_3.nickname = "Sunshine"
tenant_3.occupation = "Police Officer"

tenant_4 = Tenant.new "Isaac", "Farmer", "June 16th, 1983", "male"
tenant_4.nickname = "Baker"
tenant_4.occupation = "Entrepreneur"


puts tenant_1.full_name
puts tenant_2.full_name
puts tenant_3.full_name
puts tenant_4.full_name
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apartment.rb


class Apartment
  def initialize unit, num_beds, num_baths
    @unit = unit
    @num_beds = num_beds
    @num_baths = num_baths
  end
end