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class LimitOsDescription < ActiveRecord::Migration[4.2]
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class FakeOperatingSystem < ApplicationRecord
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self.table_name = 'operatingsystems'
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end
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def up
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FakeOperatingSystem.where("description <> ''").each do |os|
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os.update_attribute(:description, os.description.truncate(255))
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end
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change_column :operatingsystems, :description, :string, :limit => 255
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end
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def down
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change_column :operatingsystems, :description, :text
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end
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end
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