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class AddDigestToSources < ActiveRecord::Migration[4.2]
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def up
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remove_index(:sources, :value) if index_exists?(:sources, :value)
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add_column :sources, :digest, :string, :limit => 40
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Source.find_each { |m| m.update_attribute(:digest, Digest::SHA1.hexdigest(m.value)) }
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add_index :sources, :digest
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end
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def down
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remove_index :sources, :digest
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remove_column :sources, :digest
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add_index :sources, :value
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end
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end
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