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 Bad parts of django
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* There's no ``session`` in ORM, so if you want flexibility in some
  situations not to call ``save()``, and in some -- do call, then you
  need to implement ``save=True`` parameter in your business-logic.
* There's no identity-map in ORM, so you need to make sure by yourself
  that if you modified some object (and did not save it), all later
  code will use the same object. Also you get additional queries
  everywhere, and if you have "by id" external links, you can't do
  quicks optimization by just selecting "most hot" objects once, and
  be sure they'll be loaded from memory (or do it by hands).