Google Cloud Python Lib - Get Entity By ID or Key

Question

I've been working on a python3 script that is given an Entity Id as a command line argument. I need to create a query or some other way to retrieve the entire entity based off this id.

Here are some things I've tried (self.entityId is the id provided on the commandline):

entityKey = self.datastore_client.key('Asdf', self.entityId, namespace='Asdf')
query = self.datastore_client.query(namespace='asdf', kind='Asdf')
query.key_filter(entityKey)
query_iter = query.fetch()
for entity in query_iter:
    print(entity)

Instead of query.key_filter(), i have also tried:

query.add_filter('id', '=', self.entityId)
query.add_filter('__key__', '=', entityKey)
query.add_filter('key', '=', entityKey)

So far, none of these have worked. However, a generic non-filtered query does return all the Entities in the specified namespace. I have been consulting the documentation at: https://googleapis.dev/python/datastore/latest/queries.html and other similar pages of the same documentation.

Answer 1

I've fixed this problem myself. Because I could not get any filter approach to work, I ended up doing a query for all Entities in the namespace, and then did a conditional check on entity.key.id, and comparing it to the id passed on the commandline.

    query = self.datastore_client.query(namespace='asdf', kind='Asdf')
    query_iter = query.fetch()
    for entity in query_iter:
        if (int(entity.key.id) == int(self.entityId)):
            #do some stuff with the entity data