agenda-libre-ruby/db/migrate/20150711164423_create_versions.rb

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# Add the version table necessary to paper trail
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, %i[item_type item_id]
end
end