django rest framework - Error with Nested Serializer -

i have following model , serializer:

class seminartracking(models.model):     id = models.bigintegerfield(primary_key=true)     id_tax_seminar = models.bigintegerfield(null=true, blank=true)     cid = models.foreignkey('clients.client')     invite = models.integerfield(null=true, blank=true)     invite_2 = models.integerfield(null=true, blank=true)     rsvp = models.charfield(max_length=255l, blank=true)     attendees = models.integerfield(null=true, blank=true)     names = models.charfield(max_length=255l, blank=true)     notes = models.textfield(blank=true)      class meta:         db_table = 'tax_seminars_tracking'  class seminartrackingserializer(serializers.hyperlinkedmodelserializer):      class meta:         model = seminartracking 

client serialize:

class clientserializer(serializers.hyperlinkedmodelserializer):     #adwebsite = serializers.primarykeyrelatedfield()     #adissue = serializers.primarykeyrelatedfield(required=false)     #category = serializers.primarykeyrelatedfield(many=true)     status = serializers.field()     seminars = seminartrackingserializer(source='seminartracking_set')      class meta:         model = client 

whenever access client via api, following error:

(1054, "unknown column 'tax_seminars_tracking.cid_id' in 'field list'") 

if access seminartracking_set in view or template, works no problems. there missing? - note primary key of client model clientid, not id - not sure if that's relevant.

many thanks, ben

i had specify column name on "cid" feild.