Google App Engine Python: Know if an entity has been 'seen' by a user

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If you use messaging apps (Whatsapp, BBM, Facebook's Messenger), then you should be familiar with the indication of your messages being 'seen' by your recipient.

I would like to build this feature to my entities.

For example, consider this Entity(ndb.Model):

class Entity(ndb.Model):
    title = ndb.StringProperty()
    seen = ndb.BooleanProperty(default = False)

How do I make it so that: if a particular user sees this entity, then the seen property will be set to True?

asked 1 min ago

haopei

112