Added clean_username function to validate form.

django_lostplaces/lostplaces/forms.py

@@ -48,6 +48,14 @@ class ExplorerUserChangeForm(UserChangeForm):
         self.fields['username'].required = False
         self.fields['username'].help_text = None
         self.fields['username'].widget.attrs['disabled'] = 'disabled'
+    
+    def clean_username(self):
+        # As shown in the above answer.
+        instance = getattr(self, 'instance', None)
+        if instance:
+            return instance.username
+        else:
+            return self.cleaned_data.get('username', None)
 
 class ExplorerChangeForm(forms.ModelForm):
     class Meta:

django_lostplaces/lostplaces/views/explorer_views.py

@@ -60,7 +60,6 @@ class ExplorerProfileUpdateView(IsAuthenticatedMixin, View):
         explorer_change_form = ExplorerChangeForm(request.POST, instance=request.user.explorer)
 
         if explorer_change_form.is_valid() and explorer_user_change_form.is_valid():
-            print(explorer_user_change_form)
             explorer_user_change_form.save()
             explorer_change_form.save()