#5863: list_display does not allow functions of referenced objects
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Reporter: Beat | Owner: nobody
Bolli <me+django@…> | Status: closed
Type: | Component: contrib.admin
Uncategorized | Severity: Normal
Milestone: | Keywords: list_display
Version: SVN | Has patch: 1
Resolution: wontfix | Needs tests: 0
Triage Stage: Design | Easy pickings: 0
decision needed |
Needs documentation: 1 |
Patch needs improvement: 1 |
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Comment (by lukeplant):
Also, in response to andybak and anonymous, please note:
list_display is fundamentally different from list_filter and
search_fields. The other two are defining operations that must happen in
the database, whereas list_display is defining an operation that must
happen in Python code, and refers to Python functions/methods, and **not**
to database fields. The confusion is that a name that of a database field
is also the name of the corresponding attribute on the Python object, but
that is where the similarity ends.
So, for instance, you can set `'__unicode__'` in list_display, and it will
refer to the `__unicode__` method, and not attempt any field lookups,
despite the presence of double underscores. As it happens, this example
makes it obvious that we cannot sensibly add the feature as proposed - how
would you refer to the `__unicode__` method on a related object?
`'foreign_key____unicode__'`? How would you parse that? What about other
methods that people might choose to define, like `__html__`, etc.? The
only way this feature could get in is we are happy with a bunch of special
cases in the implementation, and a bunch of arbitrary limitations in
functionality.
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Ticket URL: <http://code.djangoproject.com/ticket/5863#comment:37>
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