CODEWITHSUNDEEP
pythongoogle-app-enginegoogle-cloud-datastoreapp-engine-ndb
gsinha
gsinha

Reputation: 1185

How to access all repeated structured properties in GAE ndb Python

class X(ndb.Model): 
    content = ndb.StringProperty() 
    number = ndb.IntegerProperty() 

class P(ndb.Model): 
    unit = ndb.StructuredProperty(X, repeated=True)

Using Datastore viewer, i could see the following stored data: 

Entity Kind             P 
Entity Key              ag1kZXZ-bGlmZXN3YWxschoLEg1BZHZlcnRpc2VtZW50IGCAgICA4NcKDA 
ID                      6015428115566296 
unit.content (list)     [u'Apple', u'Coca Cola', u'Orange', u'Audi']
unit.number (list)      [10L, 5L, 10L, 10L]

Goal: To access the different unit.content values (like, 'Apple', etc)

[i am a novice in GAE Python; so please excuse if the question is too silly]

My (unsuccessful)attempt[i tried a few other ways but in vain]: 

unitv_query = P.query() 
mv = unitv_query.fetch() 
    for a in mv.unit: 
        logging.info ("content=[%s]", a.content)

I get the following error: 

    :: 
    File "C:\learn\eg5.py", line 495, in render_unit

        for a in mv.unit:

    AttributeError: 'list' object has no attribute 'unit'

Any help is appreciated

Upvotes: 1

Views: 2041

Answers (1)

Tim Hoffman
Tim Hoffman

Reputation: 12986

unit property will be a list of X's however you are looping over the wrong things You could should be,

unitv_query = P.query() 
mv = unitv_query.fetch() 
    # mv is a list of P
    for a in mv: 

        # now loop over each entity in unit property.
        for i in a.unit:

            logging.info ("content=[%s]", i.content)

In your code you are trying to access unit from mv however mv is a list of P entities - the result of the query and therefore you can't access unit

Upvotes: 3

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