Thank you, Alfred. Can I change projection if I use Model.all() to create a Query object?
On Wed, Apr 25, 2012 at 12:53 PM, Alfred Fuller <[email protected]> wrote: > Oh, also db.Query takes a class not a string, should be: > db.Query(Article, projection=('title',)).get() > > On Tue, Apr 24, 2012 at 9:09 PM, Alfred Fuller <[email protected]>wrote: > >> ('title') is not a tuple, you need to use ('title',) or ['title'] instead >> >> >>> print ('title') >> title >> >>> print ('title',) >> ('title',) >> >>> >> >> On Tue, Apr 24, 2012 at 8:58 PM, Sun Jing <[email protected]> wrote: >> >>> I tried to use projection queries: >>> >>> class Article(db.Model): >>> title = db.StringProperty(required=True) >>> # others... >>> >>> print db.Query('Article', projection=('title')).get() >>> >>>> Traceback (most recent call last): >>>> File >>>> "/base/python_runtime/python_lib/versions/1/google/appengine/ext/admin/__init__.py", >>>> line 331, in post >>>> exec(compiled_code, globals()) >>>> File "<string>", line 3, in <module> >>>> File >>>> "/base/python_runtime/python_lib/versions/1/google/appengine/ext/db/__init__.py", >>>> line 2098, in get >>>> results = self.run(limit=1, **kwargs) >>>> File >>>> "/base/python_runtime/python_lib/versions/1/google/appengine/ext/db/__init__.py", >>>> line 2061, in run >>>> raw_query = self._get_query() >>>> File >>>> "/base/python_runtime/python_lib/versions/1/google/appengine/ext/db/__init__.py", >>>> line 2446, in _get_query >>>> kind = self._model_class.kind() >>>> AttributeError: 'str' object has no attribute 'kind' >>> >>> >>> print db.GqlQuery("SELECT title FROM Article").get().title >>> # this one works >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "Google App Engine" group. >>> To post to this group, send email to [email protected]. >>> To unsubscribe from this group, send email to >>> [email protected]. >>> For more options, visit this group at >>> http://groups.google.com/group/google-appengine?hl=en. >>> >> >> > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/google-appengine?hl=en. > -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
