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comp / comp.lang.python / Re: Serializing pydantic enums

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o Re: Serializing pydantic enumsLarry Martell

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Subject: Re: Serializing pydantic enums
From: Larry Martell
Newsgroups: comp.lang.python
Date: Wed, 29 May 2024 22:29 UTC
References: 1 2 3 4
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From: larry.martell@gmail.com (Larry Martell)
Newsgroups: comp.lang.python
Subject: Re: Serializing pydantic enums
Date: Wed, 29 May 2024 15:29:28 -0700
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On Wed, May 29, 2024 at 12:27 PM Larry Martell <larry.martell@gmail..com> wrote:
>
> On Tue, May 28, 2024 at 11:46 AM Left Right via Python-list
> <python-list@python.org> wrote:
> >
> > Most Python objects aren't serializable into JSON. Pydantic isn't
> > special in this sense.
> >
> > What can you do about this? -- Well, if this is a one-of situation,
> > then, maybe just do it by hand?
> >
> > If this is a recurring problem: json.dumps() takes a cls argument that
> > will be used to do the serialization. Extend json.JSONEncoder and
> > implement the encode() method for the encoder class you are passing. I
> > believe that the official docs have some information about this too.
>
> Yeah, I know I can do this, but I seem to recall reading that pydantic
> handled serialization. Guess not.

Actually it's as simple as adding this to any model that uses an enum model:

class Config:
use_enum_values = True

> > On Tue, May 28, 2024 at 2:50 PM Larry Martell via Python-list
> > <python-list@python.org> wrote:
> > >
> > > Just getting started with pydantic. I have this example code:
> > >
> > > class FinishReason(Enum):
> > > stop = 'stop'
> > >
> > > class Choice(BaseModel):
> > > finish_reason: FinishReason = Field(...)
> > >
> > >
> > > But I cannot serialize this:
> > >
> > > json.dumps(Choice(finish_reason=FinishReason.stop).dict())
> > > *** TypeError: Object of type FinishReason is not JSON serializable
> > >
> > >
> > > I get the object not the value:
> > >
> > > (Pdb) Choice(finish_reason=FinishReason.stop)
> > > Choice(finish_reason=<FinishReason.stop: 'stop'>)
> > >
> > >
> > > Also tried it with .value, same result.
> > >
> > > What am I missing here?

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