在before_save上創建新記錄

Question

創建新記錄時。我需要爲同一模型創建更多記錄。

例::

class XYZ < ActiveRecord 
def before_save 
    # At this point object is already initialized .. 
    # And it's containing values. 
    # At this point i want to create 10 more records for the same class. 
    # something like this 
    XYZ.new(:att1 => value1,:att2 => value2,:att3 => self.att1) 
end 
end 

請問有什麼可以處理這種情況的？ 在哪個回調中，我必須爲同一個模型創建更多記錄？

Answer 1

首先，這聽起來像是糟糕的工程，嘗試以一種能夠滿足您需求的方式重新考慮您的模型。 也許如果你需要創建10個模型的東西，不要使用activerecord鉤子，否則你可能會發生在infine循環中。

我會建議

class XYZ < ActiveRecord 
def self.create10(original_xyz) 
    10.times do 
    clone = original_xyz.clone 
    clone.save 
    end 
end 
end 

在控制器

哪裏或你有需要創建10個以上，請致電：

new_xyz = XYZ.new(:att1 => value1,:att2 => value2,:att3 => self.att1) 
new_xyz.save 
XYZ.create10(new_xyz) 

但如果你真的需要創建10更上一個鉤子（像之前保存），做：

class XYZ < ActiveRecord 

before_save create10 

attr_acessor :cloned 

def create10 
    return if cloned # this will prevent infinit loooooooooooooooop 
    10.times do 
    clone = self.clone 
    clone.cloned = true 
    clone.save 
    end 
end 

end 

我沒有運行這個，所以，先試一下。

Answer 2

class XYZ < ActiveRecord 
def after_initialize 
    # At this point object is already initialized .. 
    # And it's containing values. 
    # At this point i want to create 10 moew records for the same class. 
    # something like this 
    #XYZ.new(:att1 => value1,:att2 => value2,:att3 => self.att1) 
    x = 10 #an integer 
    x.times do |task| 
    Model.create(:key => :value) 
    end 
    end 
end