in db, i set such a property in model article:
auth = db.ReferenceProperty( author, collection_name="AuthSet" )
and use author.AuthSet to get all articles written by the certain author.
there is no query. how can i do the same thing in ndb?
在 2014年7月22日星期二UTC+8上午3时55分28秒，Jay写道：
>
> Responding to your first post ... that is right. The parent key is part of
> the entity's key. When you use get_by_id, this is just shorthand for
> Key('Foo', 99).get().
> You cannot get an entity by key unless you know the key, the whole key.
>
> You say you don't want to query, but your use case ... "give me all
> articles for user A" ... sounds like a query.
> articles = Article.query(Article.author == user_key)...
>
> If you want to do something like "most recent n articles" then you can
> store those keys in a 'secondary index' of sorts and use ndb.get_multi()
>
> On Monday, July 21, 2014 8:11:20 AM UTC-5, saintthor wrote:
>>
>> to query may cost too many ops. i don't query.
>>
>>
>>
>> 在 2014年7月21日星期一UTC+8下午8时53分29秒，Kaan Soral写道：
>>>
>>> Not associated with google, also not an expert on ndb
>>>
>>> As far as I know key groups are related with consistency, in my opinion,
>>> you shouldn't put article's and author's in the same group, there is a 1/s
>>> write speed limit on entity groups, if you put them in the same entity
>>> group, you could hit this limit more easily
>>>
>>> You don't even have to use referenceproperty's - I would just put the
>>> author key in an article StringProperty named "author" and query for it, if
>>> I were you
>>>
>>
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