将模型对象从模型复制到Django [英] Copy Model Object From a Model To Another In Django

问题描述

我必须建模。我想将模型对象从模型复制到另一个模型对象：
Model2是Model1的副本（此模型具有太多的m2m字段）
Model1：

  class Profile（models.Model）：
 user = models.OneToOneField（User）
 car = models.ManyToManyField（Car）
 job = models。 ManyToManyField（Job）
。 
。 
  

这是一个调查应用程序。我想在他/她参加调查时保存用户的个人资料（因为他可以在调查后编辑个人资料）
我已经创建了另一个模型，以便在进行调查时保存用户个人资料（我不确定其正确的方式） p>

  class SurveyProfile（models.Model）：
 user = models.OneToOneField（SurveyUser）#this是另一个进行调查的模型用户
 car = models.ManyToManyField（Car）
 job = models.ManyToManyField（Job）
  

如何将用户个人资料从个人资料复制到SurveyProfile。

提前感谢

解决方案

deepcopy etc将不起作用，因为类/模型不同。

如果您确定 SurveyProfile 具有个人资料中的所有字段 *，这应该工作（未测试）：

  for instance_of_model_a._meta.fields ：
 setattr（instance_of_model_b，field.name，getattr（instance_of_model_a，field.name））
 instance_of_model_b.save（）
  

* （在这种情况下，我建议你做一个抽象的 ProfileBase class并继承为 Profile 和 SurveyProfile 的具体类，但这并不影响我上面提到的内容）

I have to model. I want to copy model object from a model to another: Model2 is copy of Model1 (this models has too many m2m fields) Model1:

class Profile(models.Model):
      user = models.OneToOneField(User)
      car = models.ManyToManyField(Car)
      job = models.ManyToManyField(Job)
      .
      .

This is a survey application. I want to save user's profile when he/she attends the survey (because he can edit profile after survey) I have created another model to save user profile when he takes survey (Im not sure its the right way)

class SurveyProfile(models.Model):
      user = models.OneToOneField(SurveyUser) #this is another model that takes survey users
      car = models.ManyToManyField(Car)
      job = models.ManyToManyField(Job)

How can I copy user profile from Profile to SurveyProfile.

Thanks in advance

解决方案

deepcopy etc won't work because the classes/Models are different.

If you're certain that SurveyProfile has the all of the fields present in Profile*, this should work (not tested it):

for field in instance_of_model_a._meta.fields:
    setattr(instance_of_model_b, field.name, getattr(instance_of_model_a, field.name))
instance_of_model_b.save()

* (in which case, I suggest you make an abstract ProfileBase class and inherit that as a concrete class for Profile and SurveyProfile, but that doesn't affect what I've put above)

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