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class RenameSubnetNameToUnique < ActiveRecord::Migration[4.2]
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def up
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multiple_same_name = Subnet.unscoped.group(:name).count.delete_if {|name, value| value == 1}
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multiple_same_name.each_key do |subnet_name|
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subnets_with_same_name = Subnet.where(:name => subnet_name)
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subnets_with_same_name.each_with_index do |subnet, index|
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new_name = Subnet.exists?(:name => "#{subnet.name}-#{index}") ? "#{subnet.name}-#{index}-#{SecureRandom.hex(2)}" : "#{subnet.name}-#{index}"
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subnet.update_attribute(:name, new_name)
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end
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end
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end
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end
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