How to access a new spree model

问题

I am new to spree, I have created a new spree model

module Spree    
    class VerificationDocument < ActiveRecord::Base

    end
end

When I am trying to access the model from console it's showing an error

NameError: uninitialized constant Spree::VerificationDocument

Not sure what I am missing.

来源：https://stackoverflow.com/questions/35466675/how-to-access-a-new-spree-model