Add related ForeignKey fields with serializer in Django REST Framework - django

Question

I'm using Django 2.2 and Django REST Framework
I have three models like
class Plan(models.Model):
name = models.CharField(_('Plan Name'), max_length=100)
default = models.NullBooleanField(default=None, unique=True)
created = models.DateTimeField(_('created'), db_index=True)
quotas = models.ManyToManyField('Quota', through='PlanQuota')
class Quota(models.Model):
codename = models.CharField(max_length=50, unique=True)
name = models.CharFieldmax_length=100)
unit = models.CharField(max_length=100, blank=True)
class PlanQuota(models.Model):
plan = models.ForeignKey('Plan', on_delete=models.CASCADE)
quota = models.ForeignKey('Quota', on_delete=models.CASCADE)
value = models.IntegerField(default=1, null=True, blank=True)
I have to get all quota and their value from PlanQuota in the plan serializer while getting a list of plans.
I have the following serializer
class PlanQuotaSerialier(serializers.ModelSerializer):
class Meta:
model = PlanQuota
depth = 1
fields = ['quota', 'value']
class PlanListSerializer(serializers.ModelSerializer):
plan_quota = PlanQuotaSerialier(read_only=True, many=True)
class Meta:
model = Plan
depth = 1
fields = ['name', 'default', 'created', 'plan_quota']
But there is no plan_quota in the response.
How can I add all Quota and their value for each plan in a single query (SQL JOIN)?
Edit 2:
Adding source to the serializer field worked
plan_quota = PlanQuotaSerialier(source='planquota_set', many=True)
And the result is like
"results": [
{
"name": "Test Plan 1",
"default": true,
"plan_quotas": [
{
"quota": {
"id": 1,
"order": 0,
"codename": "TEST",
"name": "Test Domain",
"unit": "count",
"description": "",
"is_boolean": false,
"url": ""
},
"value": 10
},
]
}
]
Can I club all fields from quota with value field in the plan_quotas list?

Answer 1

class PlanQuota(models.Model):
plan = models.ForeignKey('Plan', on_delete=models.CASCADE, related_name='plan_quotas')
quota = models.ForeignKey('Quota', on_delete=models.CASCADE)
value = models.IntegerField(default=1, null=True, blank=True)
class PlanListSerializer(serializers.ModelSerializer):
class Meta:
model = Plan
depth = 1
fields = ['name', 'default', 'created', 'plan_quotas']

Answer 2

This is how I got it solved.
For the first query, added source
plan_quota = PlanQuotaSerialier(source='planquota_set', many=True)
For removing quota key, added to_presentation() in the PlanQuotaSerializer
def to_representation(self, instance):
representation = super().to_representation(instance)
if 'quota' in representation:
representation['quota']['quota_id'] = representation['quota'].pop('id')
representation.update(representation.pop('quota'))
return representation