Changes between Version 7 and Version 8 of NewbieMistakes

Timestamp:

Oct 9, 2005, 1:48:50 PM (20 years ago)

Author:

hugo

Comment:

hint about errors on single-char attribute errors

NewbieMistakes

@@ -61 +61 @@
 sessionlist.append(new_object)
 request.session['my_list'] = sessionlist
+
+== Errors about undefined attributes with one-char names ==
+
+==== Problem ====
+
+You get an AttributeError with some weird attribute name that's only one char long. You don't have that attribute name anywhere in your code.
+
+==== Solution ====
+
+Search your model and code for situations where you have to pass a tuple of values and want to pass a tuple with one element - and that element is a string like in this sample:
+
+{{{
+#!python
+class META:     
+    ...
+    admin = meta.Admin(
+        list_display = ('total_price'),
+        ...
+    )
+}}}
+
+It's a standard python error - you are just missing a comma in the list_display assignement like this:
+
+{{{
+#!python
+class META:     
+    ...
+    admin = meta.Admin(
+        list_display = ('total_price',),
+        ...
+    )
+}}}
+
+Since a tuple is expected but a string provided, the code will merrily iterate over the characters of the string instead of the tuple elements - and that's where the single-char attribute names come from.