Django Rest Framework Multiple nested writable serializers
I am trying to implement multiple nested writable serializers using django rest framework. I have read the available docs http://www.django-rest-framework.org/api-guide/serializers/#writable-nested-representations
I was able to do this for siblings, but have a problem where there are multiple sockets. For example, I have these 3 serializers:
class FarmerSerializer(serializers.ModelSerializer):
dob = serializers.DateField(write_only=True)
gender = serializers.CharField(write_only=True)
farms = FarmSerializer(required=False, many=True)
class Meta:
...
def create(self, validated_data):
# check if nested objects were provided, in particular farms
farms = validated_data.pop('farms', None)
farmer = Farmer(**validated_data)
farmer.added_by_id = validated_data.get('added_by_id')
farmer.save()
if farms is not None:
for farm in farms:
new_farm = Farm.objects.create(farmer=farmer, added_by=farmer.added_by, **farm)
# check for blocks -- fails
blocks = farm.pop('farm_blocks', None)
if blocks is not None:
for block in blocks:
FarmBlock.objects.create(farm=new_farm, added_by=farmer.added_by, **block)
return farmer
class FarmSerializer(serializers.ModelSerializer):
county = CountySerializer(read_only=True)
county_id = serializers.UUIDField(write_only=True)
farm_blocks = FarmBlockSerializer(required=False, many=True)
class FarmBlockSerializer(serializers.ModelSerializer):
...
I would like to be able to post JSON that is nested and stores all 3 levels in farm, farm and farm blocks. It currently works when I save the first 2 levels. Farmer and associated farms. If that helps, here's the JSON structure I'm trying to store:
[
{
"name": "Ashley King",
"phone_number": "0765124764",
"gender": "F",
"dob": "1980-11-26",
"national_id": "29719008",
"farms": [
{
"name": "Big Farm 3",
"farm_size": "18",
"county_id": "5e208ba8-5f6c-4dac-a946-dada0c5250a2",
"constituency": "Nakuru",
"ward": "Town",
"town": "Nakuru",
"contact_name": "Winnie W.",
"contact_phone_number": "0724301432",
"farm_blocks": [
{"block_size": 4.56}
]
},
{
"name": "Big Farm 4",
"farm_size": "9.6",
"county_id": "5e208ba8-5f6c-4dac-a946-dada0c5250a2",
"constituency": "Nakuru",
"ward": "Town",
"town": "Nakuru",
"contact_name": "Winnie W.",
"contact_phone_number": "0724301432"
}
]
},
{
"name": "Dennis Wainaina",
"phone_number": "0764578389",
"gender": "M",
"dob": "1988-11-26",
"national_id": "27675654",
"farms": [
{
"name": "Big Farm 6",
"farm_size": "18",
"county_id": "5e208ba8-5f6c-4dac-a946-dada0c5250a2",
"constituency": "Nakuru",
"ward": "Town",
"town": "Nakuru",
"contact_name": "Winnie W.",
"contact_phone_number": "0724301432"
},
{
"name": "Big Farm 5",
"farm_size": "9.6",
"county_id": "5e208ba8-5f6c-4dac-a946-dada0c5250a2",
"constituency": "Nakuru",
"ward": "Town",
"town": "Nakuru",
"contact_name": "Winnie W.",
"contact_phone_number": "0724301432"
}
]
}
]
+3
source to share
1 answer
Perhaps you can edit your method create
somewhat similar to this,
def create(self, validated_data):
farms = validated_data.pop('farms', None)
farmer = Farmer.objects.create(**validated_data)
if farms is not None:
for farm in farms:
#pop farm_blocks before creating new_farm
blocks = farm.pop('farm_blocks', None)
new_farm = Farm.objects.create(farmer=farmer, added_by=farmer.added_by, **farm)
#then create farm_bocks
if blocks is not None:
for block in blocks:
FarmBlock.objects.create(farm=new_farm, added_by=farmer.added_by, **block)
return farmer
+2
source to share