[Solved] Identify the error in this serializer validation code: class ProductSerializer(serializers.Serializer): price = serializers.FloatField() def validate(self, data): if data['price'] < 0:... | Django

Django - DRF Advanced Features

Identify the error in this serializer validation code:

class ProductSerializer(serializers.Serializer):
    price = serializers.FloatField()

    def validate(self, data):
        if data['price'] < 0:
            raise serializers.ValidationError('Price must be positive')
        return data

    def validate_price(self, value):
        if value == 0:
            raise serializers.ValidationError('Price cannot be zero')
        return value

Avalidate method should call super().validate(data)

Bvalidate_price should return data, not value

CNo error, code is correct

DValidationError messages must be dictionaries, not strings

Step-by-Step Solution

Solution:

Step 1: Check validate_price method
It correctly checks if value is zero and raises error, then returns value.
Step 2: Check validate method
It checks if price is negative and raises error, then returns data dictionary.
Step 3: Confirm ValidationError usage
Passing string message is allowed; dictionary is optional for field-specific errors.
Final Answer:
No error, code is correct -> Option C
Quick Check:
Both validate and validate_ methods are valid [OK]

Quick Trick: Both validate and validate_ can coexist and return correct types [OK]

Common Mistakes:

MISTAKES

Expecting validate_price to return data dict
Thinking super().validate(data) is mandatory
Believing ValidationError must be dict only

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More Django Quizzes

Identify the error in this serializer validation code:

Step 1: Check validate_price method

Step 2: Check validate method

Step 3: Confirm ValidationError usage

Final Answer:

Quick Check:

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