thanks a lot guys!
On Mon, Sep 15, 2008 at 6:10 PM, Jirka Vejrazka <[EMAIL PROTECTED]>wrote:
>
> Hi, this is how I do it, but don't rely on effectiveness of this
> solution - I'd be the first one to say that I'm a mediocre programmer
> :)
>
> def serialize(data):
> '''Input: instance of PluginParameters
> Output: base64-encoded string that can be stored in a database
> '''
> if not isinstance(data, PluginParameters):
> error('Attempt to serialize data of unsupported type (%s)' %
> type(data))
> raise TypeError('Cannot serialize data of type %s' % type(data))
> # Loop through all attributes, identify any QuerySets
> # and use only their 'query' attribute for pickling (disregard the rest)
> for attr_name in data.__dict__:
> value = getattr(data, attr_name)
> if isinstance(value, QuerySet):
> setattr(data, attr_name, value.query)
> if _compress:
> res = b64encode(zlib.compress(pickle.dumps(data)))
> else:
> res = b64encode(pickle.dumps(data))
> debug2('Serialized parameters: %g bytes' % len(res))
> return res
>
> def deserialize(data):
> '''process base64 encoded pickled object
> and return an instance of PluginParameters
> '''
> debug2('Deserializing parameters: %g bytes' % len(data))
> if _compress:
> res = pickle.loads(zlib.decompress(b64decode(data)))
> else:
> res = pickle.loads(b64decode(data))
> # identify any 'query' object and reconstruct the original QuerySet
> for attr_name in res.__dict__:
> value = getattr(res, attr_name)
> if isinstance(value, Query):
> # the black magic starts here ;-)
> model = value.model # get the original model owning the query
> qs = model.objects.all() # create a QuerySet based on that model
> qs.query = value # reattach the orignal 'query' to the QuerySet
> setattr(res, attr_name, qs) # and inject this back to the
> # PluginParameters object
> return res
>
> Hope this helps
>
> Jirka
>
> >
>
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