型串行類型錯誤在相關領域

Question

我從來沒有與Django的REST框架合作過，但我想序列化我的幾個型號的，因爲我想最終得到並通過JS，而不是Django的這些特定型號的發佈信息。我有一個工作正常，但名爲ManifestSerializer給我的錯誤：TypeError: 'Freight' object is not iterable。這裏是我的代碼：

Models.py：

class Freight(models.Model): 
    pu_location = models.OneToOneField(AddressBook, to_field='address', related_name='pu_location') 
    pu_customer = models.CharField(max_length=200) 
    pu_appt_time = models.DateTimeField(default=datetime.now) 
    po_number = models.CharField(max_length=20) 
    load_number = models.CharField(max_length=10, blank=True, null=True) 
    pallet_count = models.IntegerField(validators=[MaxValueValidator(99)]) 
    content_type = models.CharField(max_length=20, choices=[('Frozen', 'Frozen'), ('Chilled', 'Chilled'), ('Dry', 'Dry')]) 
    cases_count = models.IntegerField(validators=[MaxValueValidator(9999)]) 
    weight = models.IntegerField(validators=[MaxValueValidator(99999)]) 
    del_customer = models.CharField(max_length=200) 
    del_location = models.OneToOneField(AddressBook, to_field='address', related_name='del_location') 
    del_city = models.CharField(max_length=50, blank=True, null=True) 
    del_state = models.CharField(max_length=2, blank=True, null=True) 
    del_appt_time = models.DateTimeField(default=datetime.now) 
    invoice_amount = models.DecimalField(max_digits=8, decimal_places=2) 
    status = models.CharField(max_length=20, choices=[('New', 'New'), ('EnRoute', 'En Route'), ('Complete', 'Complete'), ('NotExecuted', 'Not Executed')], default='New') 
    note = models.ForeignKey(Note, blank=True, null=True) 

    def save(self, *args, **kwargs): 
     reg = re.compile(r',\s+?(?P<city>[^,]+),\s+(?P<state>[A-Za-z]{2})') 
     location = str(self.del_location) 
     extract = reg.search(location) 
     city = extract.group('city') 
     state = extract.group('state') 

     if not self.del_city: 
      self.del_city = city 
     if not self.del_state: 
      self.del_state = state 
     super(Freight, self).save(*args, **kwargs) 

    def __unicode__(self): 
     return "%s : %s : %s" % (self.po_number, self.pu_customer, self.del_location) 


class Manifest(models.Model): 
    manifest_number = models.AutoField(primary_key=True) 
    freight = models.ForeignKey(Freight) 
    status = models.CharField(max_length=20, choices=[('New', 'New'), ('Pending', 'Pending'), ('InProgress', 'In Progress'), ('Complete', 'Complete')], default='New') 
    note = models.ForeignKey(Note, blank=True, null=True) 
    weight = models.IntegerField(validators=[MaxValueValidator(99999)]) 
    pallet_count = models.IntegerField(validators=[MaxValueValidator(99)]) 
    revenue = models.DecimalField(max_digits=10, decimal_places=2) 
    trailer = models.ForeignKey(Trailer) 
    created_on = models.DateTimeField(default=datetime.now) 
    status_change = models.DateTimeField(blank=True, null=True) 

    def __unicode__(self): 
     return "%d" % self.manifest_number 

Serializers.py：

from rest_framework import serializers 
from dispatch.models import Manifest, Freight 


class FreightSerializer(serializers.ModelSerializer): 

    class Meta: 
     model = Freight 
     fields = '__all__' 


class ManifestSerializer(serializers.ModelSerializer): 

    class Meta: 
     model = Manifest 
     fields = '__all__' 

回溯：

Traceback (most recent call last): 
    File "<console>", line 1, in <module> 
    File "/home/jboucher/anaconda3/envs/openroad/lib/python3.6/site-packages/rest_framework/serializers.py", line 534, in data 
    ret = super(Serializer, self).data 
    File "/home/jboucher/anaconda3/envs/openroad/lib/python3.6/site-packages/rest_framework/serializers.py", line 263, in data 
    self._data = self.to_representation(self.instance) 
    File "/home/jboucher/anaconda3/envs/openroad/lib/python3.6/site-packages/rest_framework/serializers.py", line 501, in to_representation 
    ret[field.field_name] = field.to_representation(attribute) 
    File "/home/jboucher/anaconda3/envs/openroad/lib/python3.6/site-packages/rest_framework/relations.py", line 515, in to_representation 
    for value in iterable 
TypeError: 'Freight' object is not iterable 

Answer 1

必須在視圖中爲序列化程序添加many = true以獲取信息。這是當前視圖：

Views.py：

@api_view() 
def freight_list(request): 

    freight = Freight.objects.all() 
    serializer = FreightSerializer(freight, many=True) 
    return Response(serializer.data) 


@api_view() 
def manifest_list(request): 

    manifest = Manifest.objects.all() 
    serializer = ManifestSerializer(manifest, many=True) 
    return Response(serializer.data)