Re: register_adapter Json with custom JSONEncoder
От | Daniele Varrazzo |
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Тема | Re: register_adapter Json with custom JSONEncoder |
Дата | |
Msg-id | CA+mi_8bPLhcgA3KgyZ-g+=oSkUBjaB-JoZD5oAKVjPqbm8iiog@mail.gmail.com обсуждение исходный текст |
Ответ на | register_adapter Json with custom JSONEncoder (Hans Ginzel <hans@matfyz.cz>) |
Ответы |
Re: register_adapter Json with custom JSONEncoder
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Список | psycopg |
Hello, On Mon, 13 Jul 2020 at 16:49, Hans Ginzel <hans@matfyz.cz> 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
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