[Moose-dev] Re: keyed properties

And that key.multivalued = false. I know for a fact that collections don't work as a key in Python for example :) Toon Verwaest wrote: > And for simplicity you might even want to add that the key.type > must be > a primitive. (or even a string). > > Toon Verwaest wrote: > >> If "values of self" in the last constraint mean, for example, all >> instances in the "classes" >> property of 1 package then yes; that is exactly what I mean. >> >> Toon >> >> Adrian Kuhn wrote: >> >> >>> Do you mean to add the following property to FM3.Property >>> >>> key: FM3.Property >>> >>> with the constraint that >>> >>> if key is set, it must not be null >>> if key is set, key.class must equal self.type >>> if key is set, each value of elem.key must be unique within >>> { elem.key | elem is in values of self } >>> >>> like that? >>> >>> AA >>> >>> On 17 Dec 2007, at 10:49 , Toon Verwaest wrote: >>> >>> >>> >>> >>>> Wouldn't it be useful to be able to specify properties to be keyed >>>> when >>>> they are multivalued? This would allow us to generate dictionary >>>> related >>>> code for those keyed elements; and en plus give us a way to >>>> specify >>>> that >>>> one of the properties can not be used twice within a same >>>> environment. >>>> Example usage would be the classes property of a fm3.Package which >>>> would >>>> be keyed by the property name. >>>> >>>> Like this we would be able to do something like: >>>> aPackage.getFromClassesAt("aName") instead of having to loop >>>> over the >>>> classes until we find the right one. >>>> >>>> I know that Adrian just stores all fm3specified packages >>>> +classes into >>>> one big dictionary... but of course; having this property would >>>> also >>>> enable its use one level lower. >>>> >>>> Just a thought. >>>> >>>> Toon >>>>