Copy Model Object From a Model To Another In Django

Question

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

Answer 1

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:
    if field.primary_key == True:
        continue  # don't want to clone the PK
    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)

Answer 2

I'm having a tough time understanding what you wrote above, consequently I'm not 100% certain if this will work, but what I think I would do is something like this, if I'm understanding you right:

class Model2Form(ModelForm):
    class Meta:
        model = models.Model2

and then

f = Model2Form(**m1.__dict__)
if f.is_valid():
    f.save()

But I think this looks more like poor database design then anything, without seeing the entire model1 I can't be certain. But, in any event, I'm not sure why you want to do that anyway, when you can simply use inheritance at the model level, or something else to get the same behavior.