CODEWITHSUNDEEP
pythongoogle-app-enginetypeerror
Qier LU
Qier LU

Reputation: 73

Python TypeError on NDB Model.query()

I am following NDB Queries doc of GAE in Python, but can not continue with following errors:

# python google_appengine/remote_api_shell.py -s 127.0.0.1:8020
App Engine remote_api shell
Python 2.7.3 (default, Mar 13 2014, 11:03:55) 
[GCC 4.7.2]
The db, ndb, users, urlfetch, and memcache modules are imported.
dev~env> class Customer(ndb.Model):
...     name = ndb.StringProperty()
... 
dev~env> class Purchase(ndb.Model):
...     customer = ndb.KeyProperty(kind=Customer)
...     price = ndb.IntegerProperty
... 
dev~env> c = Customer()
dev~env> c.name = 'lvqier'
dev~env> k = c.put()
dev~env> k
Key('Customer', 5629499534213120)
dev~env> p = Purchase()
dev~env> p.customer = k
dev~env> p.price = 10
dev~env> kp = p.put()
dev~env> Purchase.query(customer=c.key).fetch()
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File ".../google_appengine/google/appengine/ext/ndb/model.py", line 3209, in _query
    qry = Query(kind=cls._get_kind(), **kwds)
  File ".../google_appengine/google/appengine/ext/ndb/utils.py", line 136, in positional_wrapper
    return wrapped(*args, **kwds)
TypeError: __init__() got an unexpected keyword argument 'customer'
dev~env>

What I want to do is get all Purchase objects of a specific Customer. Where is wrong?

Upvotes: 1

Views: 450

Answers (1)

Tim Hoffman
Tim Hoffman

Reputation: 12986

The arguments to the query and filter methods need to be expressions. So the query would look like 

Purchase.query(Purchase.customer==c.key).fetch()

Probably worth going back over the docs, it is all outlined there. https://developers.google.com/appengine/docs/python/ndb/queries#filter_by_prop

Upvotes: 3

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