django rest framework customize serializer

Question

My models are Purchase, Item, ItemGroup, Store

These are the relevant fields of the models:

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

class ItemGroup(models.Model):
    name = models.CharField(max_length=100)
    store = models.ForeignKey(Store)

class Item(models.Model):
    name = models.CharField(max_length=100)
    group = models.ForeignKey(ItemGroup)

class Purchase(models.Model):
    item = models.ForeignKey(Item)
    date = models.DateTimeField()

I want to write a serializer for Purchase. For each purchase, I want the following output:

{"item": "item_name", "store": "store_name"}

(Also there are some additional Purcahse fields, but these are easy to fetch).

I've tried to follow the relations using the django double underscore __ style, but this does not work:

class PurchaseSerializer(serializers.ModelSerializer):
    class Meta:
        model = Purchase
        fields = ('item', 'item__group__store')

mon io · Accepted Answer · 2018-12-04 16:57:05Z

2

class PurchaseSerializer(serializers.ModelSerializer):
    store = serializers.CharField(source="item.group.store.name")
    class Meta:
        model = Purchase
        fields = ('item', 'store')

Remember to prefetch store for requests optimization.

answered Dec 4, 2018 at 16:57

mon io

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JPG · Accepted Answer · 2018-12-05 06:16:48Z

1

Use source argument

class PurchaseSerializer(serializers.ModelSerializer):
    item = serializers.CharField(source='item.name')
    store = serializers.CharField(source="item.group.store.name")

    class Meta:
        model = Purchase
        fields = ('item', 'store')

answered Dec 5, 2018 at 6:16

JPG

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