I have Product and ProductCategory models.
Let's say I have ProductCategory TV, which has
Sony, Samsung as its products. I also have MobilePhone category with Apple and Nokia as its products.
Using DRF, I would like to get JSON output using serializers, which is similar to the below:
{
'TV':
[
'Sony':
{
'price': '$100',
'country': 'Japan',
},
'Samsung':
{
'price': '$110',
'country': 'Korea',
}
]
'mobile_phone':
[
'Apple':
{
'price': '$300',
'country': 'USA',
},
'Nokia':
{
'price': '$210',
'country': 'Finland',
}
]
}
The problem here is that the field names('TV', 'mobile_phone') in serializer have to be dynamic.
I know I can get the following JSON type
{
[
{
'product_category': 'TV',
'manufacturer: 'Sony',
'price': '$100',
'country': 'Japan',
},
{
'product_category': 'TV',
'manufacturer: 'Samgsung',
'price': '$110',
'country': 'Korea',
}
]
[
{
'product_category': 'mobile_phone',
'manufacturer: 'Samgsung',
'price': '$300',
'country': 'USA',
},
{
'product_category': 'mobile_phone',
'manufacturer: 'Apple',
'price': '$210',
'country': 'Finland',
}
]
}
with
class CategorySerializer(serializers.Serializer):
product_category = serializer.CharField()
manufacturer = serializer.CharField()
price = serializer.CharField()
country = serializer.CharField()
But the dynamically-changing-field-names is difficult to achieve. Is there any way I can do this?
You can support this kind of custom format by overriding to_representation of your Serializer and of the default ListSerializer:
First, you override to_representation of your serializer:
class CategorySerializer(serializers.Serializer):
# your fields here
def to_representation(self, obj):
return {
obj.manufacturer: {
'price': obj.price,
'country': obj.country
}
}
So that your serialized categories are of this form:
{
'Sony': {
'price': '$100',
'country': 'Japan'
}
}
Then to prepend the product_category in front of your list, you can use a custom ListSerializer with a custom to_representation:
class CategoryListSerializer(serializers.ListSerializer):
def to_representation(self, data):
# Group your data entries by category here
...
return {
'TV': tv_data
'mobile_phone': mobile_data
}
class CategorySerializer(serializers.Serializer):
...
class Meta:
list_serializer_class = CategoryListSerializer