My model

class BaseArticleModel(polymodel.PolyModel):
    title = db.StringProperty()
    created_at = db.DateProperty(auto_now_add=True)
    updated_at = db.DateProperty(auto_now=True)

class News(BaseArticleModel):
    body = db.TextProperty()

I ned get rows by last month. When to do filter like this

q = News.all().filter('created_at.month = ',
datetime(2011,04,01).month)

I get "IndexError: The query returned fewer than 1 results"

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