On 22 July 2011 13:32, Joshua Immanuel <josh@hipro.co.in> wrote:
Hello,
On Fri, 2011-07-22 at 13:41 +0200, Jacob Holm wrote:
On 2011-07-22 13:26, Brian Sutherland wrote:
This would be my first guess:
class INode(Interface): pass
INode.parent = Object( title=u"Parent node", schema=INode )
INode.children = List( title=u'Child nodes', value_type=Object(schema=INode) )
The method suggested by Brian works without any issues. :)
No, there are issues. Take this example:
class ITest(Interface): ... title = schema.TextLine() ... ITest.names <bound method InterfaceClass.names of <InterfaceClass __main__.ITest>> ITest.names() ['title'] ITest.description = schema.Text() ITest.names() ['title']
The fields on an interface are not stored as attributes, but are accessible using item access, e.g: ITest['title']. You cannot assign that way though:
ITest['description'] = schema.TextLine() Traceback (most recent call last): File "<console>", line 1, in <module> TypeError: 'InterfaceClass' object does not support item assignment
Adding to an interface requires messing with the '_InterfaceClass__attrs' attribute of the dictionary and is discouraged. Laurence