如何修复在 django Rest 框架中序列化 ManyToManyField 时获取 None 值
很抱歉问一个重复的问题，这个问题已经被问过很多次了。我看过很多关于这个话题的答案。但我无法重现我的问题的解决方案。 基本上我想序列化报价模型中的字段名称合作伙伴
class Quote(models.Model):
#...
partner = models.ManyToManyField(
Partner, blank=True, related_name='quote_partners')
，这是帐户应用程序中的合作伙伴模型
class Partner(models.Model):
id = models.UUIDField(primary_key=True,
unique=True,
default=uuid.uuid4,
editable=False)
name = models.CharField(max_length=100, blank=True, null=True)
group = models.OneToOneField(
Group, on_delete=models.DO_NOTHING, blank=True, null=True)
def __str__(self):
return self.name
这就是序列化程序的外观
class QuoteListSerializer(serializers.Serializer):
""" For the List views """
#...
id = serializers.UUIDField(read_only=True)
partner = serializers.CharField(read_only=True)
我正确获取所有其他字段，但不是合作伙伴字段。 最终结果如下所示：
{
"id": "cbf64980-1637-4d0d-ad1f-4eb6421df5a1",
"partner": "accounts.Partner.None",
},
但是我可以看到管理页面中此特定条目的合作伙伴字段已填充，但未显示在序列化数据中。 在合作伙伴模型中
在引用中
[
][2
任何人都知道为什么会发生这种情况以及如何解决此问题。
Sorry to ask a repetitive question which is already have been asked a lot of times. I have seen alot of answers on this topic. But I can't reproduce the solution of my problem.
Basically I want to serialize a field name partner which is in quote model
class Quote(models.Model):
#...
partner = models.ManyToManyField(
Partner, blank=True, related_name='quote_partners')
and this is the Partner models in the accounts app
class Partner(models.Model):
id = models.UUIDField(primary_key=True,
unique=True,
default=uuid.uuid4,
editable=False)
name = models.CharField(max_length=100, blank=True, null=True)
group = models.OneToOneField(
Group, on_delete=models.DO_NOTHING, blank=True, null=True)
def __str__(self):
return self.name
And this is how the serializer looks
class QuoteListSerializer(serializers.Serializer):
""" For the List views """
#...
id = serializers.UUIDField(read_only=True)
partner = serializers.CharField(read_only=True)
I'm getting all other fields properly but not the partner field.
This is the end results looks like :
{
"id": "cbf64980-1637-4d0d-ad1f-4eb6421df5a1",
"partner": "accounts.Partner.None",
},
However I can see the partners field is filled for this specific entry in the admin page but not showing in the serialized data.
In the Partner Model
In the Quote
[][2
Anybody knows why this is happening and how to fix this issue.
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如果您已经拥有相关字段的各个对象，并且正如您在评论中提到的，您想要 UUID（也是合作伙伴模型的主键），那么可以使用
PrimaryKeyRelatedField。修改您的
QuoteListSerializerfrom
到
这将返回链接到您的
Quote模型的特定对象的 UUID 集。如果你想返回字符串值那么你应该使用
StringRelatedField这将返回
名称合作伙伴对象的，因为您已在合作伙伴模型中将其设置为return self.name因此您可以获得以下格式，
If you already have the individual objects of the related fields, and as you mentioned in the comments you want the UUID which is a primary key of the Partner model as well, So can use the
PrimaryKeyRelatedField.Modify your
QuoteListSerializerfrom
to
This will return the set of UUID of those specific objects that are linked to your
Quotemodel.If you want to return the string value then u should use
StringRelatedFieldThis will return the
nameof the Partner Objects as you have set this in the Partner model toreturn self.nameSo you can obtain as the following formate,
您还必须创建 Partner 类的序列化器类。在 QuoteListSerializer 中，您调用此合作伙伴序列化程序。然后，合作伙伴序列化程序将嵌套在 json 中。
You have to make also a serializer class of the Partner class. In the QuoteListSerializer you call this partner serializer.The partner serializer will then be nested in the json.