Question

我有一个场景模型：

viewModel.ObitResults = obitResult

串行：

class Scenario(models.Model):
    stakeholder = models.ForeignKey(User, related_name='scenarios', blank=True,)
    tasks = models.ManyToManyField(Task, blank=True)

并查看以创建方案：

class ScenarioSerializer(serializers.ModelSerializer):
    tasks = TaskSerializer(many=True, required=False)
    class Meta:
        model = Scenario
        fields = '__all__'

    def create(self, validated_data):
        tasks = validated_data.pop('tasks')
        instance = Scenario.objects.create(**validated_data)
        for task_data in tasks:
            print('task_data: ', task_data)
            task = Task.objects.get(pk=task_data.get('id'))
            instance.tasks.add(task)
        return instance

    def update(self, instance, validated_data):
        tasks = validated_data.pop('tasks', [])
        instance = super().update(instance, alidated_data)
        for task_data in tasks:
            task = Task.objects.get(pk=task_data.get('id'))
            instance.tasks.add(task)
        return instance

视图中的print语句打印：

elif request.method == 'POST':
    print(request.data)
    serializer = ScenarioSerializer(data=request.data)
    if serializer.is_valid():
        serializer.save(stakeholder=request.user)
        return Response(serializer.data, status=status.HTTP_201_CREATED)
    else:
        return Response(
            serializer.errors, status=status.HTTP_400_BAD_REQUEST)

序列化器中的print语句create（）方法打印：

{u'tasks': [{u'what_can_go_wrong': u'', u'stakeholder': 2, u'why_perform_task': u'', u'how_often': u'', u'title': u'Seven', u'how_important_task': u'', u'people_involved': u'', u'special_training_required': None, u'why_important_task': None, u'project': 1, u'sequence_of_actions': u'', u'how_important_improvement': u'', u'role': u'', u'benefits_of_improvement': u'', u'effects_of_task': u'', u'tools_used': u'', u'special_vocabulary_used': u'', u'id': 7, u'any_improvements': u'', u'what_training_required': u''}, {u'what_can_go_wrong': u'', u'stakeholder': 2, u'why_perform_task': u'', u'how_often': u'DS', u'title': u'Eight', u'how_important_task': u'', u'people_involved': u'', u'special_training_required': None, u'why_important_task': None, u'project': 2, u'sequence_of_actions': u'', u'how_important_improvement': u'', u'role': u'', u'benefits_of_improvement': u'', u'effects_of_task': u'', u'tools_used': u'', u'special_vocabulary_used': u'', u'id': 8, u'any_improvements': u'', u'what_training_required': u''}]}

并抛出错误('task_data: ', OrderedDict([(u'title', u'Seven'), (u'how_often', u''), (u'how_important_task', u''), (u'role', u''), (u'why_perform_task', u''), (u'why_important_task', None), (u'sequence_of_actions', u''), (u'tools_used', u''), (u'special_training_required', None), (u'what_training_required', u''), (u'what_can_go_wrong', u''), (u'effects_of_task', u''), (u'special_vocabulary_used', u''), (u'people_involved', u''), (u'any_improvements', u''), (u'how_important_improvement', u''), (u'benefits_of_improvement', u''), (u'stakeholder', <User: reza123>), (u'project', <Project: One>)]))

为什么会这样？以某种方式，当它到达序列化器时，id会丢失？

更新：任务模型和TaskSerializer：

DoesNotExist: Task matching query does not exist.

虽然我收到了错误，但是创建了一个Scenario但没有任务。

堆栈跟踪：

class Task(models.Model):
    stakeholder = models.ForeignKey(User, related_name='tasks', blank=True, )
    project = models.ForeignKey(Project, related_name='project_tasks' )
    title = models.CharField(max_length=50, blank=True, null = True, )
    ...

class TaskSerializer(serializers.ModelSerializer):
    class Meta:
        model = Task
        fields = '__all__'

Answer 1

如下所示更改TaskSerializer，

class TaskSerializer(serializers.ModelSerializer):
    id = serializers.IntegerField()
    class Meta:
        model = Task
        fields = '__all__'

并期望请求有效载荷为，

{
    "tasks":[
        {
            "project" : 1,
            "stakeholder":1,
            "title":"title1",
            "id":1111
        },
        {
            "project" : 2,
            "stakeholder":2,
            "title":"title2",
            "id":2222
        }

        ],


}

Django序列化器DoesNotExist：匹配查询不存在错误

1 个答案: