python - Django中类元的目的是什么？

Question

的用途是什么？ class Meta: 在 Django 内部的类中使用 serializers.py文件？

Answer 1

Serializer classes can also include reusable validators that are applied to the complete set of field data. These validators are included by declaring them on an inner Meta class.
Also when you are defining a serializer then meta tags will help the serializer to bind that object in the specified format

下面是一些例子:

在验证指定格式的请求数据时:

class EventSerializer(serializers.Serializer):
    name = serializers.CharField()
    room_number = serializers.IntegerField(choices=[101, 102, 103, 201])
    date = serializers.DateField()

    class Meta:
        # Each room only has one event per day.
        validators = UniqueTogetherValidator(
            queryset=Event.objects.all(),
            fields=['room_number', 'date']
        )

从数据库获取数据时

class AccountSerializer(serializers.ModelSerializer):
    class Meta:
        model = Account
        fields = ['id', 'account_name', 'users', 'created']

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