Create understanding urls django.py
Create understanding urls django.py

function <code>get_absolute_url(self):</code> in <code>models.py</code> has reserve with name <code>page_detail</code> and with adding kwargs is <code>slug</code>. 
So, in your <code>urls.py</code>, put name of <code>slug</code> from your <code>models.py</code> and with <code>name="page_detail"</code>
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