Using objects to create an explicit hierarchy.
----------------------------------------------
Key: MODPYTHON-73
URL: http://issues.apache.org/jira/browse/MODPYTHON-73
Project: mod_python
Type: Improvement
Components: publisher
Versions: 3.2.0
Reporter: Graham Dumpleton
Priority: Minor
Cut and paste of idea presented on mailing list. See:
http://www.mail-archive.com/python-dev@httpd.apache.org/msg00294.html
Have a strange patch here for consideration.
In CherryPy, one can manually construct the page hierarchy by writing:
cpg.root.onepage = OnePage()
cpg.root.otherpage = OtherPage()
cpg.root.some = Page()
cpg.root.some.page = Page()
The closest equivalent to this in mod_python is the publisher handler,
whereby a URL will be mapped to attributes and member functions of a
class. One generally though has to create an actual class to encapsulate
all the bits together.
One can to a degree with publisher create a mapping without creating a
proper class by using:
class _Mapping:
pass
def _method1():
return "_method1"
def _method2():
return "_method2"
object = _Mapping()
object.onepage = _method1
object.otherpage = _method2
What isn't possible though without creating a real class is have a
normal function which is called when the dummy mapping object itself
is the target. Ie., following does not work:
object.__call__ = _method1
This is because util.apply_fs_data() assumes that __call__() is always
an object method.
I know this is sort of an abuse of __call__(), but it does actually
work in Python itself, just not in mod_python when URLs are mapped to
object.
>>> class A:
... pass
...
>>> def _method():
... return "method"
...
>>> a=A()
>>> a.__call__ = _method
>>>
>>> a()
'method'
Anyway, I have attached a patch which would allow this sort of thing to
actually work within mod_python.
I feel it could be a useful way of quickly constructing special object
hierarchies from other functions, objects and attributes without having
to actually create real classes.
For example:
def _method():
return "method"
class _Mapping:
pass
_subdir1 = _Mapping()
_subdir1.__call__ = _method # .../root/subdir1
_subdir1.page1 = _method # .../root/subdir1/page1
_subdir1.page2 = _method # .../root/subdir1/page2
root = _Mapping()
root.__call__ = _method # .../root
root.page1 = _method # .../root/page1
root.subdir1 = _subdir1
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