[英]Django rest framework serialize model with FK
I'm learning Django and Vue.js.我正在学习 Django 和 Vue.js。 There is something I'm not understanding how it works.
有些东西我不明白它是如何工作的。
I have a model "Nc" which have some foreign key to other models like Affaire.我有一个 model “Nc”,它对其他模型(如 Affaire)有一些外键。
How can I obtain in my JSON files the str return for instances instead of the real value...如何在我的 JSON 文件中获取str返回实例而不是实际值...
models.py:模型.py:
class Affaires(models.Model):
id = models.PositiveSmallIntegerField(primary_key=True)
nom = models.CharField(max_length=50)
adresse = models.CharField(max_length=100, blank=True, null=True)
cp = models.CharField(max_length=5, blank=True, null=True)
ville = models.CharField(max_length=50, blank=True, null=True)
dessinateur = models.PositiveSmallIntegerField(blank=True, null=True)
conducteur = models.PositiveSmallIntegerField(blank=True, null=True)
chefdeprojet = models.PositiveSmallIntegerField(blank=True, null=True)
cloture = models.IntegerField()
class Meta:
managed = True
db_table = 'affaires'
def __str__(self):
return '{} - {}'.format(self.id, self.nom)
class NC(models.Model):
idaffaire = models.ForeignKey(Affaires, models.DO_NOTHING,verbose_name="N° d'affaire", db_column='idAffaire')
idof = models.ForeignKey(AffairesOfs, models.DO_NOTHING,verbose_name="N° d'OF", db_column='idOf')
idposte = models.ForeignKey(ProductionPostes, models.DO_NOTHING,verbose_name="Poste", db_column="idPoste")
idrepere = models.ForeignKey(AffairesReperes, models.DO_NOTHING,verbose_name="Repère", db_column='idRepere')
idnc = models.ForeignKey(Nc_type, models.DO_NOTHING,verbose_name="Type de NC", db_column='idNc_type')
quantite = models.PositiveIntegerField(verbose_name="Quantité")
dateajout = models.DateField(default=timezone.now, verbose_name="Date d'ajout", db_column='dateAjout')
class Meta:
managed = True
db_table = 'qualite_Nc'
serialize.py序列化.py
class NcSerializer(serializers.ModelSerializer):
class Meta:
model = NC
fields = '__all__'
JSON files: JSON 文件:
{
"id": 1,
"quantite": 1,
"dateajout": "2020-04-08",
"idaffaire": 1145,
"idof": 1433,
"idposte": 6271,
"idrepere": 5361,
"idnc": 1
},
{
"id": 2,
"quantite": 17,
"dateajout": "2020-04-09",
"idaffaire": 1205,
"idof": 1290,
"idposte": 5812,
"idrepere": 7004,
"idnc": 1
},
The result I want on JSON:我在 JSON 上想要的结果:
{
"id": 1,
"quantite": 1,
"dateajout": "2020-04-08",
"idaffaire": 1145 - CORTIS,
"idof": 1433,
"idposte": 6271,
"idrepere": 5361,
"idnc": 1
},
{
"id": 2,
"quantite": 17,
"dateajout": "2020-04-09",
"idaffaire": 1205 - GS Cergy,
"idof": 1290,
"idposte": 5812,
"idrepere": 7004,
"idnc": 1
},
I'm not sure the issue is to have str return on the JSON file.我不确定问题是在 JSON 文件上返回str 。 In fact I don't understand how I'm supposed to use Serialize with FK.
事实上,我不明白我应该如何将 Serialize 与 FK 一起使用。
Use serializers.StringRelatedField()
field as,使用
serializers.StringRelatedField()
字段作为,
class NcSerializer(serializers.ModelSerializer):
idaffaire = serializers.StringRelatedField()
class Meta:
model = NC
fields = '__all__'
You have to create a serializer for each of your foreign objects.您必须为每个外来对象创建一个序列化程序。
I would personally remove all the prefix id
from idaffaire
and so on from the model NC
, because you are able to do something like instance.affaire.id
and instance.idaffaire.id
does not make much sense.我会亲自从
idaffaire
中删除所有前缀id
NC
,因为您可以执行诸如instance.affaire.id
和instance.idaffaire.id
之类的操作没有多大意义。
code sample:代码示例:
class AffairesSerializer(serializers.ModelSerializer):
class Meta:
model = Affaires
fields = '__all__'
class NcSerializer(serializers.ModelSerializer):
affaire = AffairesSerializer(read_only=True)
class Meta:
model = NC
fields = '__all__'
Make sure you use select_related('affaire')
when you create you queryset to avoid unnecessary requests to the database.确保在创建查询集时使用
select_related('affaire')
以避免对数据库的不必要请求。
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