django-rest-framework/tests/issue/serializers.py

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from rest_framework import serializers
from . import models
class ItemAmountSerializer(serializers.ModelSerializer):
item = serializers.PrimaryKeyRelatedField(queryset=models.Item.objects.all())
class Meta:
model = models.ItemAmount
fields = ('item', 'amount')
class SummarySerializer(serializers.ModelSerializer):
items = ItemAmountSerializer(many=True)
def create(self, validated_data):
items = validated_data.pop('items')
instance = super().create(validated_data)
for item in items:
instance.items.add(
item['item'], through_defaults=dict(
amount=item['amount']
)
)
return instance
class Meta:
model = models.Summary
fields = ('items', )