changing model attribute by string in Django

Question

import json
from django.http import Http404, HttpResponse
from main.models import Personnages
def store_data(request):
    if request.is_ajax() and request.POST:
        value = request.POST.get("value")
        toChange = request.POST.get("name")
        id = request.POST.get("id") #A IMPORTER
        perso = Personnages.objects.get(id=id)
        perso.toChange = value
        perso.save()
        return HttpResponse(value+toChange)
    else :
        raise Http404

I have written this code but the problem is that this part does not work:

perso.toChange = value

This doesn't seem to work. I figure it is because I extract the string from JSON instead of the field.

This is the model for reference:

class Personnages(models.Model):
    id = models.AutoField(primary_key=True)
    Joueur = models.ForeignKey(User, on_delete=models.PROTECT)
    Nom = models.CharField(max_length=40)
    Age = models.CharField(max_length=20)
    Genre = models.CharField(max_length=30)
    Date = models.DateTimeField(default=timezone.now, verbose_name="Date de parution")
    Image = models.ImageField(upload_to="imagePerso/", null=True)

in order to improve the quality of the question and to make it more useful to others, I'd recommend editing the title to something like: "changing model attribute by string in Django" — tato
– tato, Commented Dec 11, 2018 at 22:16
It's done. I have difficulties to put word on my problem ^^ Thank you for the proposal. — liam ho
– liam ho, Commented Dec 11, 2018 at 22:18

tato · Accepted Answer · 2018-12-11 22:12:51Z

4

I guess you are trying to set an attribute based on a dynamic value. You are looking for setattr method (https://docs.python.org/3/library/functions.html#setattr)

In your case, replace

perso.toChange = value

with

setattr(perso, toChange, value)

On an unrelated note, when writing python code, it is advisable to follow Python coding standards as stated in PEP-8. For instance, toChange should be to_change and so on.

edited Dec 11, 2018 at 22:12

answered Dec 11, 2018 at 22:10

tato

5,6095 gold badges33 silver badges30 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Daniel Roseman Over a year ago

Almost there, but setattr is a standalone function, not a method: setattr(perso, toChange, value).

liam ho Over a year ago

It works, thank you ! I will notice about the coding standards, i am learning so it's hard to write a working code. I will wait for a standard code ^^

tato Over a year ago

If you use a python friendly IDE or editor (Sublime, PyCharm...), it will automatically check for PEP-8 compliance... and it really makes it easier to ask for help

Collectives™ on Stack Overflow

changing model attribute by string in Django

1 Answer 1

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related