Christophe Combelles wrote:
.....
I want to define objects that represent Companies.
A company can be either a client, or a provider, or both,
or in the future it could be of another type.
When the user creates a company, it must choose "client", "provider",
or both.
The choice would assign a different interface to the object:
IClient, or IProvider, and this would lead to different views for
these objects.
So "client" and "provider" are categories of companies.
So I would tend to have:
class ICompany(Interface)
class IClient(ICompany)
class IProvider(ICompany)
This is simple, but now how do I assign a name to these interface, so
that the user will choose between "Client" and "Provider", and not
between "IClient" and "IProvider"?
Is it feasible with Tagged Value ? Or with the "name" attribute in
the zope:interface ZCML declaration?
simple way:
1) in "interfaces.py":
class IMyApplicationSite(Interface):
pass
class ICompany(Interface):
pass
class IClientMarker(Interface):
pass
class IProviderMarker(Interface):
pass
2): in "model.py"
class MyApplicationSite(Folder):
def get(self, key, default):
obj = Folder.get(key, default)
if ICompany.providedBy(obj):
if 'client' in obj.tags:
directlyProvide(IClientMarker, obj)
elif 'provider' in obj.tags:
directlyProvide(IProviderMarker, obj)
return obj
class BaseCompany(Persistent):
implements(ICompany)
tags = "client provider" # or "provider"
3) in "configure.zcml"
<view
for=".interfaces.IMyApplicationSite"
type="zope.publisher.interfaces.browser.IBrowserRequest"
provides="zope.publisher.interfaces.browser.IBrowserPublisher"
factory="zope.app.container.traversal.ContainerTraverser"
permission="zope.View"
allowed_interface="zope.publisher.interfaces.browser.IBrowserPublisher"
/>
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