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這是我的模型。在其他類似型號上工作時沒有錯誤。 不確定如何解決此問題。任何幫助是極大的讚賞。由於rails_admin拋出未定義的方法`html_safe'爲零:NilClass
class OrderProduct
include Mongoid::Document
include Mongoid::Token
validates :quantity, :numericality => { :greater_than => 0 }
before_save :pre_save
after_save :post_save
token :field_name => :code, :pattern => "%C3%d7%C2"
field :quantity, type: Integer, :default => 1
field :notes, type: String
field :fit_satisfactory, type: Boolean, :default => true, overwrite: true
field :alteration_cost, type: Float, default: 0.0
field :fit_status_saved, type: Date, default: nil
field :initials, type: String
field :last_product_type_order, type: String, default: nil
auto_increment :sequence, :seed => 10000
belongs_to :order_product_status
belongs_to :product, autosave: true
belongs_to :order
belongs_to :product_fit
has_many :product_fit_entry_values, autosave: true
embeds_many :customizations, class_name: "OrderProductCustomization"
這是我得到的錯誤:[見圖片網址](http://i.imgur.com/WPj7hky.jpg) – lacostenycoder 2014-09-30 22:00:09