Hello and happy new year!
Actually I was just writing this message to ask a question, but in the meantime
I found the solution. So I'm posting it anyway in case it helps.
I have two independant classes Foo and Bar, defined in two different modules.
In the beginning, I want Foo to be a container for Bar,
with symetric containment constraints (contains and containers)
But in the future, I will probably want Bar to be contained in something else,
so I don't want to hardcode the containment constraints.
Is there a solution for this problem? Can I define containment constraint with
ZCML?
The solution is just to define a generic IBarContainer, and to define
constraints on it. Then to tell Foo to implement IBarContainer in ZCML.
class IFoo(IContainer):
pass
class IBar(Interface):
contains('dotted.path.to.IBarContainer')
class IBarContainer(IContainer):
containers(IBar)
Then I must configure the class Foo to implement IBarContainer.
<zope:class class="Foo">
<implements interface="IBarContainer">
</zope:class>
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