python - Switching from db.ReferenceProperty to ndb with Google App Engine? -

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today read article here on how make 1 many relationship use in gae rest api.

https://cloud.google.com/appengine/articles/modeling

i thought pretty straightforward, realized using ndb , not db, cannot use db.referenceproperty.

here have model route

class route(ndb.model):    driver_id = ndb.integerproperty()   requester_id = ndb.integerproperty()   startpoint = ndb.geoptproperty(required=true)   endpoint = ndb.geoptproperty(required=true)   regular = ndb.booleanproperty(required=true)   date_and_time = ndb.datetimeproperty(required=true)   places_available = ndb.integerproperty()   val_lift = ndb.integerproperty()

and here have model regulardays used if regular in json received true

class regulardays(ndb.model):    route = db.referenceproperty(route,                                    collection_name='regular_days')   monday = ndb.booleanproperty(required=true)   tuesday = ndb.booleanproperty(required=true)   wednesday = ndb.booleanproperty(required=true)   thursday = ndb.booleanproperty(required=true)   friday = ndb.booleanproperty(required=true)   saturday = ndb.booleanproperty(required=true)   sunday = ndb.booleanproperty(required=true)

so this.

if newroute.regular:                 regulardays(route=newroute,                     monday=route_json['days']['monday'],                     tuesday=route_json['days']['tuesday'],                     wednesday=['days']['wednesday'],                     thursday=route_json['days']['thursday'],                     friday=route_json['days']['friday'],                     saturday=route_json['days']['saturday'],                     sunday=route_json['days']['sunday']).put()

but confused on how change code works ndb.

thank helping

the equivalent in ndb keyproperty:

datastore key

optional keyword argument: kind=kind, require keys assigned property have indicated kind. may string or model subclass.

you'll find replacing property name sufficient in examples, except keyword collection_name not work anymore: that's because old referenceproperty did work behind-the-scenes, creating query property in referenced class try make life easier, dropped in ndb, opting more explicit approach of storing keys , letting worry implementation details.

in case you're wondering, reason change automatic properties easy use common ignore going on (out of sight, out of mind), , ended lot of work , queries time-consuming optimize.

what means instead of writing line:

for phone in scott.phone_numbers:

you'll have code phone_numbers query :)


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