tap/db/migrate/20150209113630_create_versions.rb

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class CreateVersions < ActiveRecord::Migration
def change
create_table :versions do |t|
t.string :item_type, :null => false
t.integer :item_id, :null => false
t.string :event, :null => false
t.string :whodunnit
t.text :object
t.datetime :created_at
end
add_index :versions, [:item_type, :item_id]
end
end