I am new to ZODB and to this list: greetings. I need to get some points clear about precisely when objects are fully instantiated in memory. It may be a simple matter of pointing me at some documentation; I read pretty much anything I could find but there may a problem of your jargon being different from mine:)
The main data structure of my application is a directed graph of nodes; each node has at least three slots which contain other nodes (e.g. parent, right child, left child; the parent always exists, the child slots may be None). I only want to instantiate that part of the graph that I am working on. Q1. I assume that when an object is instantiated, its "sub" objects will be in the form of some kind of proxy (perhaps that ghost I met in the ZODB How document?). Is this assumption correct? Q2. Given an object, designated by the variable a, in which of the following statements does the child become instantiated (activated?) ? child = a.leftchild name = child.name Q3. Actually, before the child is instantiated, I somehow would like to query the object a, whether there is anything in the slot, i.e. whether the content of the slot is not None. Of course, this query should not trigger the instantiation. I had the application running in another OO language. An object would first carry a proxy with the OID in a slot; it would get instantiated on access. The ad-hoc database made use of the Reiser file system, which allowed indexing serialized objects on their OID in a B tree. _______________________________________________ For more information about ZODB, see the ZODB Wiki: http://www.zope.org/Wikis/ZODB/ ZODB-Dev mailing list - ZODB-Dev@zope.org https://mail.zope.org/mailman/listinfo/zodb-dev
