“ job_id”列中的空值违反了非空约束

Question

I'm trying to upload a pdf file but I keep getting an integrity error, when I try to submit the pdf file, it looks like I have some blank space in the DB which I don't know, may someone please help me! The error is:

IntegrityError at /posts/resume/
null value in column "job_id" violates not-null constraint

models.py

class Jobs(models.Model):
    title = models.CharField(max_length=80)
    jobs_type = models.CharField(max_length=80, choices=JOB_CHOICES)
    description = models.TextField()
    requirements = models.TextField()
    posted_date = models.DateTimeField(auto_now_add=True)
    start_date = models.DateField()
    deadline = models.DateField()
    link = models.URLField()
    slug = models.SlugField(max_length=150)
    contacts = models.CharField(max_length=80)
    tags = TaggableManager()

    class Meta:
        ordering = ('-posted_date',)



class Application(models.Model):
    user = models.ForeignKey(
        settings.AUTH_USER_MODEL, related_name="application",
        on_delete=models.CASCADE)

    job = models.ForeignKey(Jobs, on_delete=models.CASCADE)
    professional_summary = models.TextField()
    resume = models.CharField(max_length=150)
    uploaded_at = models.DateTimeField(auto_now_add=True)

form.py

 class ApplicationForm(forms.ModelForm):
        resume = forms.FileField(widget=forms.FileInput(attrs={'onchange': 'uploadPreview(this)'}))
        oss_resume = forms.CharField (widget=forms.HiddenInput(), required=False)

    class Meta:
        model = Application
        fields = ('professional_summary', 'resume', )

views.py

class CreateApplicationView(LoginRequiredMixin, CreateView):
    form_class = ApplicationForm
    model = Application
    message = _("Your Event has been created.")
    success_url = reverse_lazy('posts:list_jobs')
    def __init__(self, **kwargs):
        self.object=None
        super().__init__(**kwargs)

        def form_valid(self, form):
            resume = form.cleaned_data['oss_resume']

            form.instance.user = self.request.user
            submit = form.save()
            submit.user= self.request.user

            if not resume:
                return ('posts/no_resume.html')

            else:
                submit.save()
        def get_success_url(self):
            messages.success(self.request, self.message)
            return reverse('posts:list_events')

        def get_object(self):
            resume = kwargs.get('resume')
            return Application.objects.get(resume=resume)

urls.py

url(r'^list-jobs/$', JobsListView.as_view(), name='list_jobs'),





url(r'^resume/$', CreateApplicationView.as_view(), name='resume'),

the results is

IntegrityError at /posts/resume/
null value in column "job_id" violates not-null constraint
DETAIL:  Failing row contains (7, first job , processing.pdf, 2019-07-10 11:40:06.873356+00, null, null).

Answer 1

Your Application model has a ForeignKey to Jobs model (which I think should be just Job , but that's another matter), but it is not nullable/blank. It seems to me your view does not provide a Jobs instance to the Application instance that's being created with the PDF upload, hence the error.

Update:

One way of doing this would be to add null=True, blank=True to your job field declaration on the Application model. However, this doesn't sound like a good solution, as an application should be associated to a job. So you need to allow the user to pick the job that he's applying to in the Application form or automatically assign that job to the application when you process the form submission in the CreateApplicationView .

Update 2:

In your ApplicationForm , try to do this:

 class ApplicationForm(forms.ModelForm):
        resume = forms.FileField(widget=forms.FileInput(attrs={'onchange': 'uploadPreview(this)'}))
        oss_resume = forms.CharField(widget=forms.HiddenInput(), required=False)
        job = forms.ModelChoiceField(queryset=Jobs.objects.all())


    class Meta:
        model = Application
        fields = ('professional_summary', 'resume', 'job')

I've added the field in the form for the person to pick the Job he/she's applying for. This should fix the error or push you in the right direction.