How to write custom validations in the Django REST Framework

Overview

I checked it when I made the app, so I will write it so that I can call it when I forget it.

In Django, I used to put a clean method in the form for validation, but I thought that Django REST Framework would write custom validation in the first place, so I investigated it.

How to write

Write each validation in seliarizers.py.

Function based

Write as follows.

#Validate for adults
def validate_age(age):
    if age < 21:
      raise serializers.ValidationError('It's too early for minors!')

Class based

In class base, write using the __call__ method.

In addition, since it is highly reusable on a class basis, if you basically use this, the visibility of the code will be better.

class AgeValidator(object):
    def __init__(self,num):
        self.num = num
    def __call__(self,age):
        if age < self.num:
            message = 'This page is for Adult!'
            raise serializers.ValidationError(message)

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