原始例外文本是：“QuerySet”物件沒有屬性“名稱”

嘗試獲取序列化程式 StudentSerializer 上的欄位名稱值時出現 AttributeError。序列化程式欄位可能命名不正確，并且與 QuerySet 實體上的任何屬性或鍵都不匹配。原始例外文本是：“QuerySet”物件沒有屬性“名稱”。

我的模型.py：

class Student(models.Model):
    name = models.CharField(max_length=45, verbose_name="ФИО")
..

class Group(models.Model):
    name = models.SmallIntegerField(verbose_name="Номер группы")
..

class StudentInGroup(models.Model):
    input_Students = models.DateField(verbose_name="Студент вступил в группу")
    output_Students = models.DateField(
        verbose_name="Студент покинул группу", blank=True, null=True)
    students = models.ManyToManyField(
        Student, verbose_name="Студент", related_name="Group")
    groups = models.ManyToManyField(
        Group, verbose_name="Группа", related_name="StudentInGroup")
..

class Subject(models.Model):
    name = models.CharField(max_length=50, verbose_name="Название предмета")
    groups = models.ForeignKey(Group, on_delete=models.PROTECT)
..

class Lesson(models.Model):
    date = models.CharField(max_length=15, verbose_name="Дата занятия")
    subjects = models.ForeignKey(
        Subject, verbose_name="Проведенные занятия", blank=True, on_delete=models.PROTECT)
    groups = models.ForeignKey(
        Group, verbose_name="Группа на занятии", blank=True, on_delete=models.PROTECT)

..

class Progress(models.Model):
    students = models.ForeignKey(
        Student, on_delete=models.PROTECT, verbose_name="Студент", blank=True)
    lessons = models.ForeignKey(
        Lesson, on_delete=models.PROTECT, verbose_name="Занятия", blank=True)
    attendance = models.CharField(
        max_length=3, default='Да', verbose_name='Присутствие')
    grade = models.PositiveSmallIntegerField(
        verbose_name='Оценка за занятие', default=0)

我的意見.py：

@api_view(['GET', 'POST'])
def subject_detail(request, pk):
    if request.method == 'GET':
        subjects = Subject.objects.get(pk=pk)
        #view_subjects = Subject.objects.filter(pk=pk)

        lessons = subjects.lesson_set.order_by('date')
        view_progreses = []
        for lesson in lessons:
            progress = lesson.progress_set.all()
            view_progreses.append(progress)

        relationships = subjects.groups.StudentInGroup.all()
        view_students = []
        for relationship in relationships:
            student = relationship.students.all()
            view_students.append(student)

        subjects_serializer = SubjectSerializer(subjects) # many=True
        lessons_serializer = LessonSerializer(lessons, many=True)
        students_serializer = StudentSerializer(view_students, many=True)
        progreses_serializer = ProgressSerializer(view_progreses, many=True)

        response_results = {
            'subjects_serializer': subjects_serializer.data,
            'lessons_serializer': lessons_serializer.data,
            'progreses_serializer': progreses_serializer.data,
            'students_serializer': students_serializer.data,

        }
        return Response(response_results)

我為每個模型撰寫了一個單獨的序列化程式。每個序列化器都是相同的

我的serilizers.py：

class StudentSerializer(serializers.ModelSerializer):
    class Meta:
        model = Student
        fields = '__all__'


class GroupSerializer(serializers.ModelSerializer):
    class Meta:
        model = Group
        fields = '__all__'


class StudentInGroupSerializer(serializers.ModelSerializer):
    class Meta:
        model = StudentInGroup
        fields = '__all__'


class SubjectSerializer(serializers.ModelSerializer):
    class Meta:
        model = Subject
        fields = '__all__'

uj5u.com熱心網友回復：

.all() 方法回傳一個 QuerySet 而不是物件串列，這正是您想要的。使用 .get() 方法遍歷 QuerySets 以獲取單個物件:-)

這是有關此的檔案。祝你好運

uj5u.com熱心網友回復：

請同時添加您的序列化程式代碼，因為模型和視圖看起來不錯。

uj5u.com熱心網友回復：

我回答了我的問題。有必要改寫如下：

@api_view(['GET', 'POST'])
def subject_detail(request, pk):
    if request.method == 'GET':
        subjects = Subject.objects.get(pk=pk)
        #view_subjects = Subject.objects.filter(pk=pk)

        lessons = subjects.lesson_set.order_by('date')
        view_progreses = []
        for lesson in lessons:
            for progress in lesson.progress_set.all():
                view_progreses.append(progress)

        group = subjects.groups
        relationships = group.StudentInGroup.all()
        view_students = []
        # for relationship in relationships:
        #     student = relationship.students.all()
        #     view_students.append(student)

        for relationship in relationships:
            for student in relationship.students.all():
                view_students.append(student)

        subjects_serializer = SubjectSerializer(subjects)  # many=True
        lessons_serializer = LessonSerializer(lessons, many=True)
        students_serializer = StudentSerializer(view_students, many=True)
        progreses_serializer = ProgressSerializer(view_progreses, many=True)

        response_results = {
            'subject': subjects_serializer.data,
            'lesson': lessons_serializer.data,
            'progress': progreses_serializer.data,
            'student': students_serializer.data,

        }
        return Response(response_results)

標籤：Python django 休息 django-rest-framework

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