I have an utility registered as
<utility provides="textindexng.interfaces.ILexicon" factory="textindexng.lexicon.LexiconFactory" name="txng.lexicons.default"
trying to create a new Lexicon instance through
lexicon zapi.createObject(None, 'txng.lexicons.default')
does not work (Zope 2.8, Five) because the factory does not seem to be registered for IFactory.
<utility provides="zope.component.interfaces.IFactory" component="textindexng.lexicon.LexionFactory" name="txng.lexicons.default" />
resolves the issue. But why is the explicit declaration of the factory necessary? IMO the first declaration implies the second one. So this looks like configuration overhead to me...thoughts?
This is actually a mixup of the term 'factory'. The 'factory' parameter of the <utility /> directive might suggest that an IFactory is registered, but as you found out, it isn't meant that way. With the <utility /> directive, the parameter 'factory' means a globally accessible callable (class constructor, function, etc.) that creates an instance of the utility. Think of it as a "class factory", not a "factory component" in the Zope 3 sense.
If you want an IFactory utility to be registered (so you can call createObject, for example), you need to do this explicitly. Either with a separate <utility /> directive like you quoted above, or (if you want to save a line) with the <factory /> directive.
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