## Model
class Blog(models.Model):
    OT = 0
    VH = 1
    SV = 2
    blog_TOPICS = [
        (OT, 'Others'),
        (VH, 'Vehicle'),
        (SV, 'Service'),
    ]
    author = models.ForeignKey(User, on_delete=models.CASCADE)
    title = models.CharField (max_length=250)
    content = models.TextField(max_length=600)
    topic = models.IntegerField(choices=blog_TOPICS, default=OT)
    posted_date = models.DateTimeField(auto_now_add=True)


    def __str__(self):
        return self.title



## functional view
def write_blog_view(request):
    user = request.user
    if not user.is_authenticated:
        messages.error(request, 'You need to be logged in')
        return redirect ('login')

    if request.method == 'POST':
        form = forms.blog_form(request.POST or None)
        if form.is_valid():
            blog = form.save(commit=False)
            blog.author = request.user
            blog.save()
            return reverse('blogs:blog_detail', kwargs={'pk': blog.id})
        else:
            messages.error(request, 'Failed to create the blog')
    else:
        form = forms.blog_form()
        context = {'form':form}
        return render(request, 'blog/blog_form.html', context)