On 7/24/09 6:23 PM, george hu wrote:
> In the chapter of "Add authorization", we create a root factory in
> the model.py,
>
> class RootFactory(object):
> __acl__ = [ (Allow, Everyone, 'view'), (Allow, 'editor', 'edit') ]
> def __init__(self, environ):
> self.__dict__.update(environ['bfg.routes.matchdict'])
>
>
> My question is the constructor here, I don't understand why there is a
> need to update the environ key of matchdict. I tried to print the the
> value before and after the update, they are just the same.
It's not updating the matchdict, it's updating the __dict__ of the RootFactory
with the values in matchdict.
> And I've
> also tried to change the line to pass, the program worked without any
> issue. I don't quite understand the purpose of this code here.
It's not strictly necessary. But if matchdict is {'foo':'bar'}, it makes it
possible to do things like:
request.context.foo
... in view code.
To get a better sense of what's going on, fire up any Python interpreter and
follow along with this:
[GCC 4.0.1 (Apple Inc. build 5465)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> class Foo(object): pass
...
>>> foo = Foo()
>>> foo.__dict__
{}
>>> foo.bar
Traceback (most recent call last):
File "<stdin>", line 1, in ?
AttributeError: 'Foo' object has no attribute 'bar'
>>> foo.__dict__['bar'] = 1
>>> foo.bar
1
>>> newdict = {'a':10, 'b':12}
>>> foo.__dict__.update(newdict)
>>> foo.a
10
>>> foo.b
12
>>> foo.__dict__
{'a': 10, 'b': 12, 'bar': 1}
>>>
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