Hi guys, Thanks for the suggestions! However, there is a slight detail that I forgot to mention. I need to be able to dynamically define the subcategories, and I have literally hundreds of them already defined (more to be added by users). Storing the categories as a StringListProperty seems promising. That means that when I'm writing an entity to the datastore with a specific supercategory, I have to look for all subcategories and add those to the list as well. Can you guys suggest a schema that won't require an extra call to the database by storing the relationships within the schema?
Thanks! On Jul 19, 2:20 am, gops <[email protected]> wrote: > you can achieve this in polymodel by adding all common properties to > polymodel base class and specific property to the hierarchy. > > i.e. > > Class LivingThing(polymodel.PolyModel): > Kingdom = db.StringProperty() > Phylum = db.StringProperty() > Subphylum = db.StringProperty() > > Class Mammal(LivingThing): > noofbreast = db.IntegerProperty() > > class Monkey(Mammal): > canjump = db.BooleanProperty() > > now you can create class monkey as, > Monkey(Kingdom="Animal",canjump=True) > > and later query as LivingThing.filter("Kingdom =","Animal").fetch() > > can return Monkey. > > On Jul 19, 1:04 pm, Bill Edwards <[email protected]> wrote: > > > Hi! > > > I've been recently trying to wrap my head around GAE's datatypes. Is > > there a model type in GAE that allows me to define subproperties? For > > example, I want to have a "category" property where some categories > > fall under others, and when i query for all entities within a > > supercategory, i get the subcategories also. > > > For example: > > class Animals(db.Model): > > type = db.StringProperty() > > > Animals(type='mammal') > > Animals(type='chimpanzee') > > Animals(type='monkey') > > > When I query for all animals with type mammal, i want to return all 3 > > of the above objects. > > > I've read through the documentation, and the PolyModel datastore model > > has struck my eye as being potentially helpful. However, it doesn't > > seem to quite do the job. > > > Thanks! -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
