Multiple array to json error django

Question

'list' object has no attribute '_meta'i try to merge 2 object in array after i can this but i can't return json response

def regions(request):
    result_set  = []
    for u in Regions.objects.all()[:100]:
        if 'a' in u.country:
            result_set.append([u ,Subregions.objects.filter(region_id=u.id)])
    data = serializers.serialize('json', result_set)
    return HttpResponse(data)

error code: AttributeError at / 'list' object has no attribute '_meta'

falsetru · Accepted Answer · 2014-08-30 13:24:42Z

1

serializers.serialize accepts an iterable that yields model isntances as the second parameter.

But the result_set is a list of list of models. You need to adjust the code to yield model instances.

edited Aug 30, 2014 at 13:24

answered Aug 30, 2014 at 13:12

falsetru

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7 Comments

user3036749 Over a year ago

after this; <Subregions: Subregions object> is not JSON serializable result_set = [] for u in Regions.objects.all()[:100]: if 'a' in u.country: result_set.append([u.country, list(Subregions.objects.filter(region_id=u.id))]) data = json.dumps(result_set) return HttpResponse(data, mimetype='application/json')

user3036749 Over a year ago

i get same error that is is not JSON serializable. Same ruby code doesn't get error code that @result_set.push([c.country,City.where(region_id:c.id).take(20)])

falsetru Over a year ago

@user3036749, how about this? result_set.append(u); result_set.extend(Subregions.objects.filter(region_id=u.id)). edited the answer accordingly.

user3036749 Over a year ago

result_set.append(u)TypeError at / <Regions: Regions object> is not JSON serializable

falsetru Over a year ago

@user3036749, Could you show me the full traceback by uploading it somewhere (like pastebin)

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user2195058 · Accepted Answer · 2014-08-30 16:28:47Z

0

Basically as its a list of models, it is not able to serialize. And most probably your model has a foreign key relation too.

To solve this you can have a method in the model called as_json(). Which converts the model into a dictionary.

Overall your main target should be to convert the model into dictionary.

edited Aug 30, 2014 at 16:28

answered Aug 30, 2014 at 15:16

user2195058

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