[Solved] Consider this serializer snippet:class UserSerializer(serializers.Serializer): age = serializers.IntegerField() def validate_age(self, value): if value What happens if {'age': 20} is validated? | Django

Django - DRF Advanced Features

Consider this serializer snippet:

class UserSerializer(serializers.Serializer):
    age = serializers.IntegerField()

    def validate_age(self, value):
        if value < 21:
            raise serializers.ValidationError('Age must be at least 21')
        return value

What happens if {'age': 20} is validated?

AThe age 20 is accepted and returned without error

BA ValidationError is raised with message 'Age must be at least 21'

CThe serializer ignores the validate_age method and accepts the value

DThe serializer raises a TypeError due to missing return statement

Step-by-Step Solution

Solution:

Step 1: Understand validate_age method
The method checks if the age is less than 21 and raises ValidationError if true.
Step 2: Apply validation to input 20
Since 20 < 21, the condition triggers and raises the ValidationError with the specified message.
Final Answer:
A ValidationError is raised with message 'Age must be at least 21' -> Option B
Quick Check:
ValidationError raised for age < 21 [OK]

Quick Trick: validate_ raises error if condition fails [OK]

Common Mistakes:

MISTAKES

Forgetting to return the value after validation
Assuming validate_ is optional for field validation
Misunderstanding that ValidationError stops validation

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More Django Quizzes

Consider this serializer snippet:

Step 1: Understand validate_age method

Step 2: Apply validation to input 20

Final Answer:

Quick Check:

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