Django Rest Framework可写嵌套序列化器

Django Rest Framework可写嵌套序列化器

我发现在创建所有未创建的对象之前，无法建立ManyToMany关系。（有关多对多关系，请参见Django Docs 页面。）

这是工作代码：

serializers.py

class RecipeSerializer(serializers.ModelSerializer):    ingredients = IngredientSerializer(many=True)    class meta:        model = Recipe    def create(self, validated_data):        ingredients_data = validated_data.pop('ingredients')        recipe = Recipe.objects.create(**validated_data)        for ingredient in ingredients_data: ingredient, created = Ingredient.objects.get_or_create(name=ingredient['name']) recipe.ingredients.add(ingredient)        return recipe

以下是我的update()代码。但是，我已经好几年没有对此进行研究了，也不知道它是正确的还是良好的。我已经有一段时间没有在Python或Django上工作了，所以请一take而就：

def update(self, instance, validated_data):    ingredients_data = validated_data.pop('ingredients')    instance.name = validated_data.get('name', instance.name)    instance.description = validated_data.get('description', instance.description)    instance.directions = validated_data.get('directions', instance.directions)    instance.photo = validated_data.get('photo', instance.photo)    ingredients_list = []    for ingredient in ingredients_data:        ingredient, created = Ingredient.objects.get_or_create(name=ingredient["name"])        ingredients_list.append(ingredient)    instance.ingredients = ingredients_list    instance.save()    return instance