247AppsStudio Blog

In DJango, an HttpResponse sub-class helps to create a JSON-encoded response. It was called Serialized-Object response in Django < 1.7. Its default Content-Type header is set to application/JSON. The first parameter (data set), should be a dict instance. If non-dict object is passed in as the first parameter, a TypeError will be raised. To fix this error, we just need to add a parameter called “safe” to False in the method call JsonResponse.

TypeError: In order to allow non-dict objects to be serialized set the safe parameter to False

This is the fix:

return JsonResponse(["a", "b", 1, 2], safe=False)

The safe boolean parameter defaults is True. If it’s set to False, any object can be passed for serialization (otherwise only dict instances are allowed).

Example non-dict object:

some_object = [{‘pk’: 86, “model”: “machine_models.machinemodel”, “notes”: “This is warehouse imported machine.”}]

A complete sample:

from django.http import JsonResponse

def home_details(req):
    response = {
        'id': 1,
        'address': '123 Main St., San Jose, CA 95111',
        'beds': 3,
        'baths': 2,
        'status': Sold
    }
    return JsonResponse(response)

1) OperationalError at /admin/csv_app/invoicefile/add/
no such table: csv_app_invoicefile
==>solve this error by cmd
makemigrations csv_app
migrate

2)System check identified no issues (0 silenced).
You have 6 unapplied migration(s). Your project may not work properly until you
apply the migrations for app(s): csv_app.
Run ‘python manage.py migrate’ to apply them.
July 13, 2021 – 14:55:01
Django version 3.2.5, using settings ‘proj3.settings’
Starting development server at http://127.0.0.1:8000/
Quit the server with CTRL-BREAK.

==>to fix this error, go to cmd enter:
$python manage.py makemigrations csv_app
$python manage.py migrate
$py manage.py runserver

3)os.path.join(BASE_DIR, ‘static’),
NameError: name ‘os’ is not defined
==>add this line in settings.py
import os