CODEWITHSUNDEEP
python-2.7google-app-enginegoogle-cloud-datastore
user2998453
user2998453

Reputation: 62

Add properties to Google Datastore entity dynamically

I have a below use case:

I have a method that accepts a list of strings. For each of the strings, I need to create a property under an existing google data store entity A

Example: I have an existing entity Person with properties fname and lname. If the input list has strings - address, city, I need to update the entity Person to include these new properties address and city.

I'm coding this use case in Python. Any suggestions on how I can achieve this?

Upvotes: 1

Views: 1077

Answers (2)

Y2H
Y2H

Reputation: 2537

So the best way to do this is to let your class inherit ndb.Expando. The difference between Expando and Model is that you can always add attributes to an Expando entity and be able to store it in the Datastore.

Knowing this, there are several ways to proceed, but I am guessing you’re also going to need to use Python’s setattr(object, name, value) method to pass the attribute name from a string.

Upvotes: 3

Tony P.
Tony P.

Reputation: 191

Take a look at the Expando model class: https://cloud.google.com/appengine/docs/standard/python/ndb/creating-entity-models#creating_an_expando_model_class

class Person(ndb.Expando):
    pass

person = Person(fname='some', lname='body')
person_key = person.put()

...

person = person_key.get()
person.city = 'San Francisco'
person.address = '1234 Main St.'
person.put()

Upvotes: 2

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