如何通过外键Django序列化多对多?
我有型号“B”,通过外键多对多:如何通过外键Django序列化多对多?,django,django-models,many-to-many,django-serializer,Django,Django Models,Many To Many,Django Serializer,我有型号“B”,通过外键多对多: class DManager(m.Manager): def get_by_natural_key(self, name): return self.get(name=name) class D(m.Model): objects = DManager() id = m.AutoField(primary_key=True) name = m.CharField(max_length=250, unique=
class DManager(m.Manager):
def get_by_natural_key(self, name):
return self.get(name=name)
class D(m.Model):
objects = DManager()
id = m.AutoField(primary_key=True)
name = m.CharField(max_length=250, unique=True, null=False)
def natural_key(self):
return (self.name)
class A(m.Model):
id = m.IntegerField(unique=True, null=False, primary_key=True)
name = m.CharField(max_length=250, null=True)
class B(m.Model):
id = m.IntegerField(unique=True, null=False, primary_key=True)
name = m.CharField(max_length=250, null=True)
type = m.ForeignKey(D)
bs = m.ManyToManyField(A, through='C')
def natural_key(self):
## ?natural key for many-to-many?
return(self.name, self.type.natural_key(), ?????)
class C(m.Model):
a_id = m.ForeignKey(A)
b_id = m.ForeignKey(B)
我可以通过外键(B-D)获取关系,但在我的ajax.py中无法获取多对多(B-A)的关系:
....
if request.is_ajax():
aj_d = json.loads(request.body.decode('utf-8'))
raw_data = serializers.serialize(
'python', m.B.objects.filter(
bs__a_id__in=aj_d['data']).distinct(),
use_natural_foreign_keys=True)
output = json.dumps(raw_data)
return HttpResponse(output, content_type='application/json')
例如,可能通过values()存在另一种方式。但我对DICT的转储列表有问题——“JSON不可序列化”:
解决方案:
def push_data(request):
q = m.B.objects
if request.is_ajax():
data = json.loads(request.body.decode('utf-8'))
if 'req_1' in data:
q = q.filter(bs__id__in=data['req_1'])
if 'req_2' in data:
q = q.filter(type__id__in=data['req_2'])
actual_data = q.values('name', 'id', 'type__name')
mtm_get(actual_data) ## down
return HttpResponse(json.dumps(list(actual_data)),
content_type='application/json; charset=utf8')
对于多对多:
def mtm_get(data):
for d in data:
d['a_name'] = ', '.join(''.join(i) for i in m.B.objects.filter(
pk=d['id']).values_list('bs__name'))
def mtm_get(data):
for d in data:
d['a_name'] = ', '.join(''.join(i) for i in m.B.objects.filter(
pk=d['id']).values_list('bs__name'))