django rest framework - nested serializers - django

Question

I have those models and serializers:
models.py
class CompanyUserProfile(AbstractUserProfile):
guid = models.UUIDField(verbose_name=_('GUID'), unique=True)
organization = models.ForeignKey(
verbose_name=_('organization'),
to='my_company.Organization',
related_name='user_profiles',
null=True,
blank=True,
)
position = models.ForeignKey(
verbose_name=_('position'),
to='my_company.Position',
related_name='user_profiles',
null=True,
blank=True,
)
store_pcs = models.ManyToManyField(
verbose_name=_('Store PCs'),
to='my_company.StorePC',
related_name='user_profiles',
)
#
location = models.ForeignKey(
verbose_name=_('WorkLocation'),
to='my_company.WorkLocation',
related_name='user_profiles',
null=True,
blank=True,
)
class StorePC(AbstractOrganizationalUnit):
store_number = models.CharField(
max_length=50,
editable=False,
help_text=_("..."),
null=True,
unique=True
)
anchor = models.BooleanField(
default=False,
editable=False,
help_text=_('...'),
)
#python_2_unicode_compatible
class Transcript(TimeStampedModel):
csod_profile = models.ForeignKey(
CompanyUserProfile,
null=True, blank=True,
related_name='transcripts',
verbose_name="Company Profile"
)
learning_objective = models.ForeignKey(
LearningObjective,
verbose_name="Learning objective",
related_name="transcripts"
)
transcript_status = models.ForeignKey(
TranscriptStatus,
verbose_name=""
)
transcript_status_last_modified = models.DateTimeField(
verbose_name="Transcript Status last modified",
null=True, blank=True
)
brand = models.ForeignKey(
Score,
null=True, blank=True,
verbose_name="Score",
related_name="transcripts"
)
passed = models.NullBooleanField(
verbose_name="Has passed"
)
requested_on = models.DateTimeField(
verbose_name="Requested on",
null=True, blank=True
)
registered_on = models.DateTimeField(
verbose_name="Registered on",
null=True, blank=True
)
assigned_on = models.DateTimeField(
verbose_name="Assigned on",
null=True, blank=True
)
due_date = models.DateTimeField(
verbose_name="Due date",
null=True, blank=True
)
completed_on = models.DateTimeField(
verbose_name="Completed on",
null=True, blank=True
)
custom_dashboard = models.BooleanField(
verbose_name="",
default=True
)
completion_percentage = models.PositiveSmallIntegerField(
verbose_name="",
null=True, blank=True
)
timestamp = models.DateTimeField(
verbose_name="Timestamp"
)
serializers.py
class TranscriptSerializer(serializers.ModelSerializer):
id = serializers.CharField(source='get_id', read_only=True)
value = serializers.IntegerField(source='get_title', read_only=True)
# segment_id = serializers.CharField(default="N/A", read_only=True)
class Meta:
model = Transcript
fields = ('id', 'value')
def get_title(self, obj):
return obj.learning_objective.title
def get_id(self, obj):
return obj.learning_objective.lo_id
class PeopleSerializer(serializers.ModelSerializer):
name = serializers.SerializerMethodField('get_full_name')
title = serializers.SerializerMethodField('get_position')
los = TranscriptSerializer(source='transcripts', many=True)
class Meta:
model = CompanyUserProfile
fields = ('id', 'name', 'title', 'los')
def get_full_name(self, obj):
return obj.user.get_full_name()
def get_position(self, obj):
return obj.position.name
class StoreSerializer(serializers.ModelSerializer):
people = PeopleSerializer(source='user_profiles', many=True)
class Meta:
model = StorePC
fields = ('id', 'name', 'people')
however an API query return a result where attribute 'los' is always empty:
{
"count": 1,
"next": null,
"previous": null,
"results": [
{
"id": 11405,
"name": "... ",
"people": [
{
"id": 887,
"name": "AAA BBB",
"title": "... title 1",
"los": [
{}
]
},
{
"id": 9263,
"name": "XYZ XYZ",
"title": "title 3",
"los": [
{}
]
},
...
}
does anybody see any errors that I don't see?
Thank You