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class CreateMediaOperatingsystemsAndMigrateData < ActiveRecord::Migration
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class Medium < ActiveRecord::Base; end
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def self.up
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medium_hash = Hash.new
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Medium.all.each do |medium|
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unless medium.operatingsystem_id.nil?
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if Operatingsystem.exists?(medium.operatingsystem_id)
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os = Operatingsystem.find(medium.operatingsystem_id)
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medium_hash[os] = medium
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else
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say "skipped #{medium}"
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end
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end
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end
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create_table :media_operatingsystems , :id => false do |t|
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t.references :medium, :null => false
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t.references :operatingsystem, :null => false
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end
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medium_hash.keys.each { |os| os.media << medium_hash[os] }
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remove_column :media, :operatingsystem_id
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end
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def self.down
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add_column :media, :operatingsystem_id, :integer
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drop_table :media_operatingsystems
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end
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end
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