[Answered ]-How to make an object JSON serializable

by

1👍

✅

The easier way to do that is using serialization native from Django.

from django.core import serializers


class Exercise(models.Model):
    name = models.CharField(null=False,max_length=255)

    def __unicode__(self):
        return str(self.id)

serialized_data = serializers.serialize("json", Exercise.objects.all(), fields=('name'))

Making your custom class return JSON

from json import dumps

class ExercisesObject:
    def __init__(self, aScore, aExercises):
        self.score = aScore
        self.exercises = [{e.id: e.name} for e in aExercises]

    def json(self):
        return dumps({'score': self.score, 'exercises': self.exercises})
👤Mauro Baraldi

1👍

You can provide custom json encoder which is subclass of json.JSONEncoder:

class Exercise:
    def __init__(self, value):
        self.value = value
        self.name = 'soem name'


import json
class CustomEncoder(json.JSONEncoder):
    def default(self, o):
        if isinstance(o, Exercise):
            return {'value': o.value, 'name': o.name}
        return super(CustomEncoder, self).default(o)

obj = {
    'exercises': [
        Exercise(16),
        Exercise(1),
        Exercise(177),
        Exercise(163),
        Exercise(291),
        Exercise(209)
    ],
    'score': 16.0
}
print(json.dumps(obj, cls=CustomEncoder, indent=4))

output:

{
    "exercises": [
        {
            "name": "some name",
            "value": 16
        },
        ...
    ],
    "score": 16.0
}
👤falsetru

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