On 03.03.2006, at 08:27, Shane Hathaway wrote:
Hello,
I've been assigned to present Zope in a local upcoming Python user
group meeting. As part of the assignment, I'm supposed to solve
the PyWebOff challenge using Zope:
http://pyre.third-bit.com/pyweb/challenge.html
I'd like to do this using Zope 3. However, I'm really struggling.
I feel like I must be using Zope 3 in a really dumb way, because
the code so far is highly repetitive, completely dependent on Zope,
and more XML than Python. This is not going to go over well in the
presentation.
Can anyone tell me how to do this better with Zope 3? Maybe my
Zope 2 experience is preventing me from seeing something obvious.
I've attached the __init__.py and configure.zcml that I created in
a package called "challenge".
Shane
from zope.interface import Interface, implements
from zope.schema import Field, TextLine, Int, Date
from zope.app.container.interfaces import IContained, IContainer
from zope.app.container.constraints import ItemTypePrecondition
from zope.app.container.constraints import ContainerTypesConstraint
from zope.app.container.btree import BTreeContainer
class IBook(Interface):
title = TextLine(title=u'title')
year = Int(title=u'year')
authors = TextLine(title=u'authors')
class ILoan(Interface):
username = TextLine(title=u'username')
day = Date(title=u'day')
class ILibrary(IContainer):
def __setitem__(name, object):
pass
__setitem__.precondition = ItemTypePrecondition(IBook, ILoan)
class IBookContained(IContained):
__parent__ = Field(
constraint = ContainerTypesConstraint(ILibrary))
class ILoanContained(IContained):
__parent__ = Field(
constraint = ContainerTypesConstraint(ILibrary))
class Book(object):
implements(IBook, IBookContained)
class Loan(object):
implements(ILoan, ILoanContained)
class Library(BTreeContainer):
implements(ILibrary)
if you use v 3.2 then you should use
from zope.app.container.constraints import contains, containers
instead of the precondition stuff, so you don't need
that ...Contained interfaces, because you can define the interfaces
as strings
well, this just reduces the python code, but looks much cleaner
e.g.
class IBook(IContained):
title = TextLine(title=u'title')
year = Int(title=u'year')
authors = TextLine(title=u'authors')
containers('challange.interfaces.ILibrary')
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