storing a List using Django REST framework

Question

I have a model that contains the newly added ListField class in DRF. I am trying to store a List of strings so the output would look like so:

{

    "hashtags":["something", "new"],

}

I'm pretty new to working with DRF but I seem to be having some trouble serializing the result. When I run the request I received a HashField() is not JSON serializable error. Again I'm new to working with the the framework and Python in general but any suggestions, point in the right direction would be a help.

models.py

class HashField(serializers.ListField):
    child = serializers.CharField(max_length=100)

 class Mention(models.Model):
    author = models.ForeignKey(User)
    hashtags = HashField()      
    placename = models.CharField(max_length=140, default='SOME STRING')
    created_date = models.DateTimeField(
            default=timezone.now)
    published_date = models.DateTimeField(
            blank=True, null=True)

    def publish(self):
        self.published_date = timezone.now()
        self.save()

    def __str__(self):
        return self.placename

serializers.py

class MentionSerializer(serializers.ModelSerializer):
    class Meta:
        model = Mention

I provided an update with an answer over here stackoverflow.com/questions/34194246/… — gregdevs
– gregdevs, Commented Dec 10, 2015 at 20:37

Dhia · Accepted Answer · 2015-12-09 20:21:35Z

1

Django REST Framework has different kind of serializers, what you need here is a field serializer that validates a list type. in serializers.py do as follow:

class MentionSerializer(serializers.ModelSerializer):
    hashtags = serializers.ListField()
    class Meta:
        model = Mention

answered Dec 9, 2015 at 20:21

Dhia

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6 Comments

gregdevs Over a year ago

thank @dhiatn. I tried that, now getting exception "Got a TypeError when calling Mention.objects.create(). This may be because you have a writable field on the serializer class that is not a valid argument to Mention.objects.create(). You may need to make the field read-only, or override the MentionSerializer.create() method to handle this correctly. Original exception text was: 'hashtags' is an invalid keyword argument for this function."

Dhia Over a year ago

@gregdevs I will recommend to use ArrayField in th model field: hashtags = ArrayField(models.CharField(max_length=100), blank=True) and the serializers.ListField in the DRF serializer hashtags = serializers.ListField().

Dhia Over a year ago

that's right and it will be great if you switch to PostgreSQL, because in the next django realease 1.9 there will be more support for complex data-structure and PostgreSQL will offer you more flexiblity and efficiency. You still can you use this third party module jsonfield it works fine with MySQL too @gregdevs.

gregdevs Over a year ago

thanks, going to check this out in a bit, will let you know on my progress. thanks again for the help

Dhia Over a year ago

great and best of luck

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