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 Question.objects.annotate(num_votes=Sum('choice__votes'))

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Question.objects.filter(question_text='Is the color of sky blue').annotate(choice_count=Count('choice'))

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Question.objects.annotate(choice_count=Count('choice'))

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Choice.objects.count()

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Question.objects.count()

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class Question(models.Model):
    question_text = models.CharField(max_length=200)
    
    def __str__(self):
        return self.question_text


class Choice(models.Model):
    question = models.ForeignKey(Question, on_delete=models.CASCADE)
    choice_text = models.CharField(max_length=200)

akshar-raaj

class UserSerializer(serializers.ModelSerializer):

    def validate_password(self, value):
        if value.isalnum():
            raise serializers.ValidationError('password must have atleast one special character.')
        return value

    def validate(self, data):
        if data['first_name'] == data['last_name']:
            raise serializers.ValidationError("first_name and last_name shouldn't be same.")

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def create(self, validated_data):
    return User.objects.create_superuser(**validated_data)

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    def to_internal_value(self, value):
        value['date_joined'] = parser.parse(value['date_joined'])
        return super().to_internal_value(value)

akshar-raaj

class UserSerializer(serializers.ModelSerializer):

    def validate_password(self, value):
        if value.isalnum():
            raise serializers.ValidationError('password must have atleast one special character.')
        return value

    def validate(self, data):
        if data['first_name'] == data['last_name']:
            raise serializers.ValidationError("first_name and last_name shouldn't be same.")