rails_admin - 嵌入的命名空間模型不顯示

在下面的例子中，報價::的PropertyInfo不會在rails_admin儀表盤顯示：

class Offer 
    include GlobalID::Identification 
    include Mongoid::Document 
    include Mongoid::Timestamps 

    field :price, type: Integer 
    field :funding_source, type: String 
    field :name, type: String 
    field :email, type: String 
    field :phone, type: String 
    field :phone_verified, type: Mongoid::Boolean, default: false 

    embeds_one :property_info, class_name: "Offer::PropertyInfo" 

    belongs_to :property 
end 

class Offer::PropertyInfo 
    include Mongoid::Document 

    field :street_name, type: String 
    field :street_number, type: String 
    field :unit_number, type: String 
    field :city, type: String 
    field :state, type: String 
    field :zip, type: String 

    embedded_in :offer 
end

Not linked in the admin