django.db.utils.IntegrityError: FOREIGN KEY constraint failed

Using Django Mystery Errors
1

Iam overriding the modeladmin when i try to save the many to many field in admin form iam getting this Foreinkey Error, if i didnt select it works.

#admin.py 
def save_model(self, request, obj, form, change):
        user = request.user

        if not change:
            _id = uuid.uuid4()
            form_data = form.cleaned_data
            data = {
                '_id': _id,
                'organisation': form_data['organisation'],
                'project': form_data['project'],
                'title': form_data['title'],
                'description': form_data['description'],
                'reporting_timestamp': form_data['reporting_timestamp']
            }
            files = form_data['attachments']
            obj = controllers.incident.create(data, files, user, request)
            return

#incident.py

def create(data, files, user, request):

    incident = Incident.objects.create(
        **data,
        reporter=user
    )
    incident.state = 'OPEN'
    print("files", files)
    if files is not None:
        incident = save_attachment(
            files=files,
            instance=incident
        )
    incident.save()

    parameters = {
        'user': str(user),
        '_id': str(incident._id)
    }
    log_event(
        action='ims.incident.create',
        parameters=parameters

    )
    return incident

#save_attachment function in controllers.py

def save_attachment(files, instance):
    """
    Saves multiple file attachments and associates many-to-many relation 
    with a specific model instance.

    Parameters
    ----------
    files : list of file-like objects
        List of files to be attached.
    instance : Model instance
        The model instance to which the files are being attached.

    Returns
    -------
    None
    """

    if instance._id is None:
        instance.save()
    attachments = []

    for file in files:
        attachment, created = Attachment.objects.get_or_create(file=file)
        attachment.save()
        attachments.append(attachment)

    instance.attachments.add(*attachments)

    return instance
2

Welcome @Karthikeyan-t2002 !

Side Note: When posting code here, enclose the code between lines of three backtick - ` characters. This means you’ll have a line of ```, then your code, then another line of ```. This forces the forum software to keep your code properly formatted. (I’ve taken the liberty of editing your original post for this, please remember to do this in the future.

Please post the models involved here, along with the complete error message and traceback from the server. (Post the error from the runserver console if this is a local development environment, please do not post screenshots of the browser page error message display.)

4

In my normal views the creation works fine but not in admin site

5

We’re likely going to need to see more information, because this is the admin throwing this error.

Please post the complete models and admin classes involved.

Additionally, you show your Attachment model as inheriting from BaseModel - we’ll need to see that as well.