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class CreateSubscriptionsTable < ActiveRecord::Migration
def change
create_table :subscriptions do |t|
t.integer :user_id
t.references :subscribable, polymorphic: true
t.boolean :subscribed
t.timestamps
end
add_index :subscriptions,
[:subscribable_id, :subscribable_type, :user_id],
unique: true,
name: 'subscriptions_user_id_and_ref_fields'
end
end
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