allow to make comments for non-abstract models by COMMENTS_FOR_CONCRE…

…TE_MODEL setting

django_comments/forms.py

@@ -14,6 +14,7 @@
 
 COMMENT_MAX_LENGTH = getattr(settings, 'COMMENT_MAX_LENGTH', 3000)
 DEFAULT_COMMENTS_TIMEOUT = getattr(settings, 'COMMENTS_TIMEOUT', (2 * 60 * 60))  # 2h
+COMMENTS_FOR_CONCRETE_MODEL = getattr(settings, 'COMMENTS_FOR_CONCRETE_MODEL', True)
 
 
 class CommentSecurityForm(forms.Form):
@@ -138,7 +139,10 @@ def get_comment_create_data(self, site_id=None):
         method to add extra fields onto a custom comment model.
         """
         return dict(
-            content_type=ContentType.objects.get_for_model(self.target_object),
+            content_type=ContentType.objects.get_for_model(
+                self.target_object,
+                for_concrete_model=COMMENTS_FOR_CONCRETE_MODEL,
+            ),
             object_pk=force_str(self.target_object._get_pk_val()),
             user_name=self.cleaned_data["name"],
             user_email=self.cleaned_data["email"],