使用Model.create當父類尚未保存

我試圖創建一個translate關鍵字，創造了一流的人工作是一個簡單的字符串，但使用不同的值，這取決於語言環境設置的。使用Model.create當父類尚未保存

這裏是我的代碼：

module Translate 
    def translate(*attr_name) 
    _field_name = attr_name[0] 
    has_many :translations 
    define_method(_field_name) do 
     self.translations.where(key: _field_name, locale: I18n.locale).first 
    end 
    define_method("#{_field_name}=") do |params| 
     self.translations.create!(key: _field_name, locale: I18n.locale, value: params.to_s) 
    end 
    end 
end 

class Translation 
    include Mongoid::Document 
    field :key, type: String 
    field :value, type: String, default: '' 
    field :locale, type: String 

    belongs_to :productend 
end 

class Product 
    include Mongoid::Document 
    extend Translate 
    translate :description 
end

我得到這個錯誤：

Mongoid::Errors::UnsavedDocument: 
Problem: 
    Attempted to save Translation before the parent Product. 
Summary: 
    You cannot call create or create! through the relation (Translation) who's parent (Product) is not already saved. This would case the database to be out of sync since the child could potentially reference a nonexistant parent. 
Resolution: 
    Make sure to only use create or create! when the parent document Product is persisted. 
from /Library/Ruby/Gems/2.0.0/gems/mongoid-3.1.7/lib/mongoid/relations/proxy.rb:171:in `raise_unsaved'

來源

2015-09-21 Morniak

它在說產品尚未保存，在那裏創建？ – Anthony

我與'P = Product.new'控制檯來測試我的代碼創建它。 – Morniak

權，嘗試'P = Product.create' – Anthony

您的問題是在錯誤消息拼寫出來，但你只需要之前，你可以創建一個Product嘗試並創建相關記錄。

含義這可不行：

product = Product.new 
product.translations.create!

這可以：

product = Product.create 
product.translations.create!

來源

2015-09-21 13:27:43 Anthony

使用Model.create當父類尚未保存

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