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DjangoでQuerySetをJSONResponseする

Last updated at Posted at 2022-09-15

Djangonのモデルから引っ張ってきたQuerySetをそのままJSONで返そうとすると怒られてしまう。

users = CustomUser.objects.filter(prefecture = 'yamagata')
data = { 
    ...
    'users' : users,
    ...
}
return JsonResponse(data)

TypeError: Object of type QuerySet is not JSON serializable

解決

.values()で値を取り出してlist()でリストに変換。

users = list(CustomUser.objects.filter(prefecture = 'yamagata').values())
data = { 
    ...
    'users' : users,
    ...
}
return JsonResponse(data)

serializers.serializeなどを使ってJSONに変換しても通るが、template側でJSON.parseしなければならず、こちらの方がシンプルだった。

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