python - Tastypie annotation error "empty attribute..." -

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i'm using tastypie create api , i'm stuck trying annotate sum total of decimals on type. each transaction has associated bucket type , i'd group bucket type, , sum transactions.

api resource

class transactiontotalresource(modelresource):      class meta:         queryset = ttransaction.objects.values('bucket').annotate(bucket_total=sum('amount'))            resource_name = 'transaction_total'         include_resource_uri = false         allowed_methods = ['get']         authorization= authorization()

model

class ttransaction(models.model):     bucket = models.foreignkey(tbucket)     date = models.datefield()     transaction_type_id = models.integerfield()     amount = models.decimalfield(null=true, max_digits=18, decimal_places=2, blank=true)     account_id = models.integerfield()     recurrence_flag = models.smallintegerfield(null=true)     notes = models.charfield(null=true,max_length=100)     paid = models.smallintegerfield(null=true)     is_credit = models.smallintegerfield(null=true)     reconciled = models.smallintegerfield(null=true)     active = models.smallintegerfield()     class meta:         db_table = u't_transaction'         ordering = ['-date']

if run terminal, works.

from django.db.models import sum ttransaction.objects.values('bucket').annotate(bucket_total=sum('amount'))  [{'bucket': 10, 'bucket_total': decimal('35.24')}, {'bucket': 2, 'bucket_total': decimal('62.00')}]

however, hitting transaction_total url , get

{"error": "the object '{'bucket': 10, 'bucket_total': decimal('35.24')}' has empty attribute 'account_id' , doesn't allow default or null value."}

if set model fields "null=true", different error:

{"error_message": "invalid literal int() base 10: ''", "traceback" ...

is there way tastypie work annotaion?

thought answer since found way in dehydrate method:

def dehydrate(self, bundle):     transaction = ttransaction.objects.filter(bucket_id=bundle.data['id']).values('bucket').order_by('bucket').annotate(sum('amount'))     bundle.data['transaction_total'] = transaction     return bundle

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