restframework_关系模型序列化_1查多-【官方】百战程序员_IT在线教育培训机构


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class Student(models.Model):

    SEX_CHOICES = ((1,'男')), (2, '女')

    name = models.CharField(max_length=20, verbose_name='姓名')
    age = models.IntegerField(null=True, blank=True, verbose_name='年龄')
    sex = models.IntegerField(choices=SEX_CHOICES, default=1, verbose_name='性别')
    
    # 必须增加属性 related_name='students'
    classes = models.ForeignKey(Classes, related_name='students', null=True, on_delete=models.SET_NULL, verbose_name='班级')

serializers：


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from rest_framework import serializers

from .models import Classes, Student

class StudentSerializer(serializers.ModelSerializer):
    class Meta:
        model = Student
        fields = ['id','name','age','sex']

class Class2Serializer(serializers.ModelSerializer):
    # 通过related_name反向查询的字段，创建序列化器对象
    students = StudentSerializer(many=True,read_only=True)
    class Meta:
        model = Classes
        fields = ['id','name','students']

注意
StudentSerializer 必须在 ClassesSerializer 上面

urls:


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path('classes/<int:pk>/', views.classes_detail),

views：


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def classes_detail(request, pk):
    try:
        classes = Classes.objects.get(pk=pk)
    except Classes.DoesNotExist:
        return HttpResponse(status=404)

    if request.method == 'GET':
        serializer = ClassesSerializer(classes)
        return JsonResponse(serializer.data)
    else:
        # 其他情况暂不处理
        return HttpResponse(status=503)

测试


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GET http://127.0.0.1:8000/rest_app/classes/1/

实时学习反馈

1. 在班级和学生对应关系中，想获取班级信息时候获取该班级所有学生信息，那么需要在 ClassesSerializer中，重新指定 students字段，下划线处分别需要填写的代码是_____:


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class ClassesSerializer(serializers.ModelSerializer):
    # students 命名是model中的 related_name
    # 多条记录，则指定 many=True , read_only=True
    _______ = StudentSerializer(many=True, read_only=True)

    class Meta:
        model = Classes
        fields = ['id', 'name', _______]

A students 'students'

B 'students' 'students'

C 'students' students

D students students

2. 在视图函数中，根据pk获取班级，下划线处需要填写的代码是_____:


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def classes(request, pk):
    try:
        #根据pk获取Classes对象
        ___________
    except Classes.DoesNotExist:
        return HttpResponse(status=404)

    if request.method == 'GET':
        serializer = ClassesSerializer(classes)
        return JsonResponse(serializer.data)
    else:
        # 其他情况暂不处理
        return HttpResponse(status=503)

A classes = Classes.get(pk=pk)

B classes = Classes.objects.get(pk=pk)

C classes = Classes.object.get(pk=pk)

D classes = Classes.Objects.get(pk=pk)

答案

1=>A 2=>B

restframework_关系模型序列化_多查1 restframework_关系模型序列化_互相引入字段

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