find_or_create_by與自定義ActiveModel :: Validator一起使用失敗

Question

我有2個名爲Drug and Frequency的模型。

#app/models/frequency.rb 
class Frequency 
    validates :code, presence: true 
end 

#app/models/drug.rb 
class DrugValidator < ActiveModel::Validator                          
    def validate(record) 
    drug_attributes = {name: record.name} 
    if Drug.where(name: record.name).any? 
     record.errors[:base] << "The drug #{record.name} already exists in system." 
    end 
    end 
end 

class Drug 
    validates_with DrugValidator, if: (lambda {|drug| drug.name.present?})  
end 


> pf = Frequency.find_or_create_by(code: 'Q24') 
Frequency Load (0.4ms) SELECT "frequencies".* FROM "frequencies" WHERE "frequencies"."code" = $1 LIMIT 1 [["code", "Q24"]] 
=> #<Frequency id: 7, code: "Q24", created_at: "2015-11-02 03:41:34", updated_at: "2015-11-02 03:41:34"> 
> pf.persisted? 
=> true 
> pf.valid? 
=> true 
> pf.new_record? 
=> false 

> pd = Drug.find_or_create_by(name: 'SomeDrug', unit: 'tablet') 
=> #<Drug id: 10, name: "SomeDrug", created_at: "2015-11-05 07:42:46", updated_at: "2015-11-05 07:42:46", unit: "tablet"> 
> pd.persisted? 
=> true 
> pd.new_record? 
=> false 
> pd.valid? 
=> false 
> pd.errors.messages 
=> {:base=>["The drug SomeDrug already exists in system."]} 

即使從系統獲取記錄時，也會執行自定義DrugValidator。我如何避免這種find_or_create_by？

Answer 1

指定驗證激活的時間。

類藥物 validates_with DrugValidator，如果：（拉姆達{|藥| drug.name.present？}），上：創建
末