Django REST displayed filtered nested resource - django

Question

I'm attempting to return JSON in a simple GET that includes a row from a joined table. The models:
class School(models.Model):
id = models.CharField(max_length=18,primary_key=True)
name = models.CharField(max_length=255,blank=False)
class Meta:
db_table='school'
class FKTable(models.Model):
school = models.ForeignKey(School,blank=False, db_column='school_id', on_delete=models.CASCADE)
name = models.CharField(max_length=45, blank=False)
value = models.CharField(max_length=255, blank=True, null=True)
class Meta:
db_table='fk_table'
And the serializer:
class SchoolListSerializer(serializers.ModelSerializer):
id = serializers.CharField(source='id')
name = serializers.CharField(source='name')
fkColumn = ????
class Meta:
model = models.School
fields = ('id','name','fkColumn')
The problem is I want to also filter the nested resource that I join against on the 'name' column so I don't know what to put for 'fkColumn' in the serializer. In SQL it would look something like this:
SELECT school.*, fk_table.value from school INNER JOIN fk_table on
fk_table.school_id = school.id AND fk_table.name = 'some name'
The end result JSON I want is:
{
"schools": [
{
"id": "someId",
"name": "someName",
"fkColumn": "Value"
}]}
RelatedField does not seem to work and none of the documentation seems to give a solid answer on how to do this. Any ideas?

Answer 1

Revised after clarification. Define an fkeySerializer:
class fkeySerializer(serializers.ModelSerializer):
...
Then link this in your main serializer:
fkey = fkeySerializer(many=True)
class Meta:
model = models.School
fields = ('id','name','fkColumn',)
You can use a MethodField serializer here. For example:
fkColumn = serializers.SerializerMethodField()
def get_fkColumn(self, obj):
return obj.fkColumn
class Meta:
model = models.School
fields = ('id','name','fkColumn',)
As an aside, perhaps there's a good reason for it, but it might be easier to rename this table to be more easily readable