在 Django 中验证 Json - Django Rest Framework

Question

我需要验证以下 JSON：

{
"monday": [
//List of MyClass object
],
"tuesday": [
//List of MyClass Object
],
"wednesday": [
//List of MyClass Object
],
......
}

我需要检查它是否包含任何不是一周中的一天的键(例如mondai，thudai(。MyClass也被定义为：

class MyClass(models.Model):
type = models.CharField(unique=True, max_length=20)
value = models.IntegerField()

字段value必须是正整数，不能超过 10000。此外，type必须cost或benefit在 Scala 中，我会使用以下方法：

object MyClass {
val ALLOWED_TYPES = Seq[String]("cost", "benefit")
implicit val openingHourReads: Reads[OpeningHour] = (
(JsPath  "type").read[String].filter(JsonValidationError("Type must be cost or benefit"))(ALLOWED_TYPES.contains(_))  and
(JsPath  "value").read[Int](min(1).keepAnd(max(10000)))
)(MyClass.apply _)

Django 中有等效的方法吗？

Answer 1

是的，在 django 中也有类似的方法：

在模型级别限制输入数据(问题#1(：

# models.py
from django.core.validators import MaxValueValidator
class MyClass(models.Model):
VALUE_CHOICES = [
('COST', 'cost'),
('BENEFIT', 'benefit')
]
class_type = models.CharField(choices=VALUE_CHOICES,unique=True)
value = models.IntegerField(validators=[MaxValueValidator(limit_value=10000)])

限制序列化程序级别的输入数据(问题 #2(：

# serializers.py
from .models import MyClass
from rest_framework import serializers
class MyClassSerializer(serializers.ModelSerializer):
class Meta:
model = MyClass
fields = '__all__'
class MainSerializer(serializers.Serializer):
day = serializers.ChoiceField(choices=['monday', 'tuesday', 'wednesday'])
my_class = serializers.ListField(child=MyClassSerializer(many=True))

最后，您需要封装数据以使其通用：

# views.py or any other place you like
from .serializers import MainSerializer
your_json = {
"monday": [
//List of MyClass object
],
"tuesday": [
//List of MyClass Object
],
"wednesday": [
//List of MyClass Object
],
......
}
json_array = []
for key, value in your_json:
json_array.append({'day':key, 'my_class':value})
serializer = MainSerializer(data=json_array, many=True)
serializer.is_valid() # this will tell you if your data is valid or not