I decide to make this post because i could not found answer to my problem on existing posts here and on Stack Overflow. But finally i found it so i want to share it with you.
I got this error:
Reverse for ‘article-view’ with arguments ‘(‘6’, ‘6’)’ not found. 1 pattern(s) tried: [’(?P[0-9]+)$’]
during processing this line of code:
def get_absolute_url(self): return reverse('article-view', args=(str(self.id)))
The problem was with brackets with should be square.
You can see that on django website.