How do we pick objects from a model to create copies in another model adding extra parameters in django?

Greg 0
Viewed 21

I have the following models:

class Questionnaire(models.Model):
    questionnaire_name = models.CharField(max_length=120, default="")
    ...

class Question(models.Model):
    question_body = models.TextField()
    ...

class QuestionnaireContent(models.Model):
    questionnaire = models.ForeignKey(Questionnaire)
    question = models.ForeignKey(Question)
    ...

The QuestionnaireContent model acts as a list of questionnaire templates. Those are assigned to users eventually, using:

class QuestionnaireAssignment(models.Model):
    user = models.ForeignKey(User)
    questionnaire = models.ForeignKey(Questionnaire)

Now, ideally, I would like this assignment to generate a new questionnaire 'instance' in another model which would have the following fields:

class QuestionnaireInstance(models.Model):
    user = models.ForeignKey(User)
    questionnaire = models.ForeignKey(Questionnaire)
    question = models.ForeignKey(Question)
    visibility = models.BooleanField()

But I would like that QuestionnaireInstance to be created automatically once a QuestionnaireAssignment instance is created. I guess I could rewrite the save function of QuestionnaireAssignmentbut I am wondering if there is a simpler/cleaner way to do this?

The idea is I want from the template questionnaires to create instance for users that can be customized for that user (adding attribute visibility and eventually changing the questions).

Thanks for your help!!

django python
1 Answers

Overriding the save() method of QuetionnaireAssignment is one possibility. Note that you don't have to completely rewrite save() since you can call super().save().

Alternatively, use the postsave signal instead: docs.djangoproject.com/en/4.1/topics/signals

Code-Apprentice0
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