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class AddOsFamilyToPtable < ActiveRecord::Migration[4.2]
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class FakePtableWithoutFamily < ApplicationRecord
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self.table_name = 'ptables'
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has_and_belongs_to_many :operatingsystems
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end
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def up
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add_column :ptables, :os_family, :string, :limit => 255 unless column_exists? :ptables, :os_family
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remove_column :ptables, :operatingsystem_id if column_exists? :ptables, :operatingsystem_id
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FakePtableWithoutFamily.reset_column_information
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FakePtableWithoutFamily.all.each do |p|
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family = p.operatingsystems.map(&:family).uniq.first rescue nil
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p.update_attribute(:os_family, family) if family
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end
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end
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def down
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remove_column :ptables, :os_family if column_exists? :ptables, :os_family
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add_column :ptables, :operatingsystem_id, :integer unless column_exists? :ptables, :operatingsystem_id
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end
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end
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