Hello, On Mon, 13 Jul 2020 at 16:49, Hans Ginzel <[email protected]> wrote: [...]
> But I need to use custom JSONEncoder because of bson.ObectId type > # https://stackoverflow.com/a/16586277/2556118 This doc page has more examples: https://www.psycopg.org/docs/extras.html#json-adaptation > There is a parameter dumps in Json.__init__(self, adapted, dumps=None), > but how to set it when used with register_adapter(), You can use a partial function for instance, of the like of: `lambda obj: Json(obj, dumps=mydumps)`. > https://www.psycopg.org/docs/extensions.html#psycopg2.extensions.register_adapter? > > Should I write myself the whole Json class? No, if you really want you can subclass the one we provide and only override `_dumps()`: the one psycopg2 provides consists in pretty much: class Json(object): def __init__(self, adapted, dumps=None): self.adapted = adapted self._dumps = dumps or json.dumps def dumps(self, obj): return self._dumps(obj) so you can either create your instances using a wrapper in register_adapter, or subclass the _dumps() method of the class: as you can see it is equivalent. I guess the first method is better as you don't need to care about the implementation of the `Json` class. -- Daniele
