thanks Simon!yes, i'm already using hooks so I can pass datetime, decimal, enums and so on; of course, it can help if I have to go with the result proxy. i just wonder if there's another way of doing this without having sqlalchemy to provide me helpers of proxy objects. i'm thinking about straight, performance-wize optimization :)
best regards, richard. On 06/01/2015 10:00 AM, Simon King wrote:
On Mon, Jun 1, 2015 at 1:51 PM, Richard Gerd Kuesters <rich...@pollux.com.br> wrote:hello all! probably this was asked before, as I already grabbed some answers already from here and stackoverflow, but I don't really feel happy about it. problem: i have a query that it's result must go directly as a json (web / rpc usage), and I wonder if I must go from the cycle . class A(Base): attr_one = Column(..) attr_two = Column(..) attr_three = Column(..) attr_four = Column(..) attr_five = Column(..) data = session.query(A.attr_one, A.attr_four) # ok, got a query object result = data.all() # got a result proxy wanted_result = map(lambda r: r._as_dict(), data.all()) # iterate through the result proxy, calling the _as_dict() method from row_proxy. it does the job, but is that really necessary? my question is if there's any way of "simplifying" the query just for json purposes, since imho the need of some proxies here may be an overkill. but ... i might be wrong :)I'm not aware of any way of getting SQLAlchemy to return "plain old dicts". How are you converting your Python dicts to JSON? JSON converters often have a hook point where you can define how custom objects are converted to JSON. Here's how you could do it in Pyramid: http://pyramid.readthedocs.org/en/latest/narr/renderers.html#using-the-add-adapter-method-of-a-custom-json-renderer And the Python json.dump function accepts a "default" parameter that could do custom serialization. Hope that helps, Simon
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