Question

当我尝试更新或发布新实例时，我的部分数据消失了。

使用这样的数据

data = {
        'item': 'Product', 
        'station': 'Workbench', 
        'ingredients':[
            {'item': 'ing1', 'amount': 2},
            {'item': 'ing2', 'amount':1}
         ]
        }

我有一个带有嵌套序列化程序的序列化程序，可根据需要get_or_creates成分。

class IngredientSerializer(serializers.ModelSerializer):

    class Meta:
        model = Ingredient
        fields = ('item', 'amount')


class WriteableRecipeSerializer(serializers.ModelSerializer):
    item = serializers.PrimaryKeyRelatedField(queryset=Item.objects.all())
    ingredients = IngredientSerializer(many=True)
    station = serializers.PrimaryKeyRelatedField(queryset=Item.objects.all())

    def create(self, validated_data):
        logger.info(validated_data)
        ingredient_data = validated_data.pop('ingredients')
        recipe = Recipe.objects.create(**validated_data)

        for ingredient in ingredient_data:
            ingredient_item = Item.objects.get(name=ingredient['item'])
            amount = ingredient['amount']
            ingredient, created = Ingredient.objects.get_or_create(item=ingredient_item, amount=amount
                                   )
            recipe.ingredients.add(ingredient)

        return recipe

    def update(self, instance, validated_data):
        logger.info(validated_data)
        ingredient_data = validated_data.pop('ingredients')
        instance.item = validated_data.get('item', instance.item)
        instance.station = validated_data.get('station', instance.station)

        for ingredient in ingredient_data:
            ingredient_item = Item.objects.get(name=ingredient['item'])
            amount = ingredient['amount']
            ingredient, created = Ingredient.objects.get_or_create(item=ingredient_item, amount=amount)
            logger.info('Itering')
            instance.ingredients.add(ingredient)

        return instance

    class Meta:
        model = Recipe
        fields = ('item', 'amount', 'ingredients', 'station')

数据验证并得到响应代码200，但我的记录器在create和update方法中显示的响应数据和validated_data都返回如下内容：

    data = {
        'item': 'Product', 
        'station': 'Workbench', 
        'ingredients':[]
        }

成分数据在某个地方AWOL。我已经尝试将Ingredient Serializer作为通用序列化程序，并重写WriteableRecipeSerializer的验证，只是返回attrs但问题仍然存在。

编辑模型：

class Ingredient(models.Model):
    item = models.ForeignKey(Item, on_delete=models.CASCADE)
    amount = models.IntegerField()

    def __str__(self):
        return self.item.name + '(' + str(self.amount) + ')'

class Recipe(models.Model):
    item = models.OneToOneField(Item, related_name='recipe', on_delete=models.CASCADE)
    amount = models.IntegerField(default=1)
    ingredients = models.ManyToManyField(Ingredient)
    station = models.ForeignKey(Item, on_delete=models.CASCADE, related_name='as_station')

    def __str__(self):
        return 'Recipe: ' + str(self.item)

Django REST Framework，PUT / POST序列化数据消失

0 个答案: