[Zope3-Users] Containers Contains

[David Johnson]

Here is an example that gives me the IInputWidget errors when I use  
the contains/containers approach:
...interfaces.py...

class ICRM(IContainer):
     """Just a blank container to hold customers."""
     contains('.ICustomer')

class ICustomer(IContainer,IContained):
     """A basic customer."""
     contains('.IService')
     containers(ICRM)

     salesperson = Choice(
         title = _(u'Sales Person'),
         description = _(u'The sales person responsible for this  
account.'),
         vocabulary = "Sales Person",
         required=True)

     supportperson = Choice(
         title = _(u'Support Person'),
         description = _(u'The support person responsible for this  
account.'),
         vocabulary = "Support Person",
         required=True)

class IService(IContained):
     """A service provided by the company."""
     containers(ICustomer)

     approveddate = Date(
         title=_(u"Approved Date(YYYY-MM-DD)"),
         description=_(u"The date this service was approved by  
finance."),
         required=False)

...
class CRM(BTreeContainer):
     """Just a blank container to hold customers."""
     implements(interfaces.ICRM)

class Customer(BTreeContainer):
     implements(interfaces.ICustomer)
     salesperson = u''
     supportperson = u''

class Service(BTreeContainer):
     implements(interfaces.IService)
     approveddate = u''
...


On Jan 26, 2007, at 9:24 PM, Marius Gedminas wrote:

> On Fri, Jan 26, 2007 at 07:48:36PM +0100, David Johnson wrote:
>> When setting up container/contained relationships, what is the proper
>> approach? Is it the approach outlined in Stephan's book with
>> IContainer, __setitem__, and preconditions?  Or is it "contains" and
>> "containers"?
>
> contains() and containers() is a newer and prettier way to achieve the
> same result.  It didn't exist when Stephan's book was written.
>
>> I have been having some problems and would be curious the definitive
>> approach.  The former is more complicated and so I find make lots of
>> coding errors.  The latter is simple but I find it causes strange
>> IInputWidget errors.
>
> Could you show us some code?
>
> Marius Gedminas
> -- 
> "Nuclear war can ruin your whole compile."
>                 -- Karl Lehenbauer
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