Retrieving a Foreign Key value with django-rest-framework serializers

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I"m using the django rest framework to create an API. I have the following models:

class Category(models.Model):
    name = models.CharField(max_length=100)

    def __unicode__(self):
        return self.name


class Item(models.Model):
    name = models.CharField(max_length=100)
    category = models.ForeignKey(Category, related_name="items")

    def __unicode__(self):
        return self.name

To create a serializer for the categories I"d do:

class CategorySerializer(serializers.ModelSerializer):
    items = serializers.RelatedField(many=True)

    class Meta:
        model = Category

... and this would provide me with:

[{"items": [u"Item 1", u"Item 2", u"Item 3"], u"id": 1, "name": u"Cat 1"},
 {"items": [u"Item 4", u"Item 5", u"Item 6"], u"id": 2, "name": u"Cat 2"},
 {"items": [u"Item 7", u"Item 8", u"Item 9"], u"id": 3, "name": u"Cat 3"}]

How would I go about getting the reverse from an Item serializer, ie:

[{u"id": 1, "name": "Item 1", "category_name": u"Cat 1"},
{u"id": 2, "name": "Item 2", "category_name": u"Cat 1"},
{u"id": 3, "name": "Item 3", "category_name": u"Cat 1"},
{u"id": 4, "name": "Item 4", "category_name": u"Cat 2"},
{u"id": 5, "name": "Item 5", "category_name": u"Cat 2"},
{u"id": 6, "name": "Item 6", "category_name": u"Cat 2"},
{u"id": 7, "name": "Item 7", "category_name": u"Cat 3"},
{u"id": 8, "name": "Item 8", "category_name": u"Cat 3"},
{u"id": 9, "name": "Item 9", "category_name": u"Cat 3"}]

I"ve read through the docs on reverse relationships for the rest framework but that appears to be the same result as the non-reverse fields. Am I missing something obvious?

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We hope this article has helped you to resolve the problem. Apart from Retrieving a Foreign Key value with django-rest-framework serializers, check other __del__-related topics.

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Carlo Wu

California | 2023-03-24

Simply put and clear. Thank you for sharing. Retrieving a Foreign Key value with django-rest-framework serializers and other issues with PS PHP module was always my weak point 😁. I am just not quite sure it is the best method

Schneider Krasiko

Singapore | 2023-03-24

StackOverflow is always a bit confusing 😭 Retrieving a Foreign Key value with django-rest-framework serializers is not the only problem I encountered. Checked yesterday, it works!

Xu Krasiko

Vigrinia | 2023-03-24

Maybe there are another answers? What Retrieving a Foreign Key value with django-rest-framework serializers exactly means?. Will use it in my bachelor thesis

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