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class AddDigestToMessages < ActiveRecord::Migration
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def up
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if ActiveRecord::Base.connection.instance_values["config"][:adapter] == "mysql" or ActiveRecord::Base.connection.instance_values["config"][:adapter] == "mysql2"
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execute "DROP INDEX value ON messages" if index_exists?(:messages, :value, :name => 'value')
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else
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remove_index(:messages, :value) if index_exists?(:messages, :value)
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end
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add_column :messages, :digest, :string
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Message.find_each {|m| m.update_attribute(:digest, Digest::SHA1.hexdigest(m.value)) }
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add_index :messages, :digest
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end
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def down
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remove_index :messages, :digest
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remove_column :messages, :digest
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add_index :messages, :value
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end
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end
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