在 django rest 框架中的另一个模型的 modelSerializer 中检索模型的最后一个实例
retrieving the last instance of a model in another model's modelSerializer in django rest framework
我正在为一个网站创建休息 APIs,用户可以在其中购买所提供的订阅之一。
本网站有一个用户信息 API,其中 return 是有关登录用户的信息,可用于在网站上显示他们的信息。
问题是,提到的 API 的序列化程序是“用户”模型上的 modelSerializer,而我想要 return 的信息是“订阅”模型的实例,它是“的最新实例” SubPurchase”模型指的是。
这些是我的序列化程序、模型和 views.And 我需要以某种方式 return 用户当前订阅的 ID 和名称以及用户信息。如果还有什么问题,可以在评论里问我,我会一一解答。
# models.py
class User(AbstractBaseUser, PermissionsMixin):
userID = models.AutoField(primary_key=True)
username = models.CharField(max_length=100, unique=True, validators=[RegexValidator(regex="^(?=[a-z0-9._]{5,20}$)(?!.*[_.]{2})[^_.].*[^_.]$")])
email= models.EmailField(max_length=100, unique=True, validators=[EmailValidator()])
name = models.CharField(max_length=100)
isSuspended = models.BooleanField(default=False)
isAdmin = models.BooleanField(default=False)
emailActivation = models.BooleanField(default=False)
balance = models.IntegerField(default=0)
objects = UserManager()
USERNAME_FIELD = 'username'
class Subscription(models.Model):
subID = models.AutoField(primary_key=True)
nameOf = models.CharField(max_length=50)
price = models.PositiveIntegerField()
salePercentage = models.PositiveIntegerField(default=0)
saleExpiration = models.DateTimeField(default=datetime.datetime.now, blank=True)
def __str__(self):
return f"{self.nameOf}"
class SubPurchase(models.Model):
price = models.PositiveIntegerField()
dateOf = models.DateTimeField(auto_now_add=True)
user = models.ForeignKey(User, null=True, on_delete=models.SET_NULL)
subscription = models.ForeignKey(Subscription, null=True, on_delete=models.SET_NULL)
def __str__(self):
return self.subscription
# serializers.py
class UserInfoSerializer(serializers.ModelSerializer):
class Meta:
model = get_user_model()
fields = ('userID', 'username','email', 'name', 'balance', 'emailActivation', 'isSuspended')
read_only_fields = ('userID', 'username','email', 'name', 'balance', 'emailActivation', 'isSuspended')
# views.py
class UserInfoViewSet(viewsets.ModelViewSet):
queryset = get_user_model().objects.all()
serializer_class = UserInfoSerializer
def get_queryset(self):
uID = getattr(self.request.user,'userID')
return get_user_model().objects.filter(userID=uID)
def get_object(self):
uID = getattr(self.request.user,'userID')
return self.queryset.filter(userID=uID)
同样,我需要更改 UserInfoSerializer 以提供用户当前订阅的名称、ID 和到期日期(即购买日期后 30 天)
如果您只对返回的数据感兴趣,您可以覆盖序列化程序的函数 to_representation
并为相关模型创建一个序列化程序。如果我没理解错的话,您用户的当前订阅是最后一个(如果按“dateOf”排序)。所以类似的东西可以解决问题
class SubscriptionSerializer(serializers.ModelSerializer):
class Meta:
model = Subscription
fields = ('nameOf', 'id', 'saleExpiration ')
class UserInfoSerializer(serializers.ModelSerializer):
class Meta:
model = get_user_model()
fields = ('userID', 'username','email', 'name', 'balance', 'emailActivation', 'isSuspended')
read_only_fields = ('userID', 'username','email', 'name', 'balance', 'emailActivation', 'isSuspended')
def to_representation(self, instance):
data = super().to_representation(instance)
current_subs = instance.subpurchase_set.order_by('dateOf').last().subscription
data['current_subscription'] = SubscriptionSerializer(instance=current_subs).data
return data
您可以使用 NestedSerializers
来实现您正在寻找的东西
基本上,嵌套序列化是一种方法,您可以在其中 return、创建、放入...,从另一个模型进入模型,它是这样的..
models.py
class User(AbstractBaseUser, PermissionsMixin):
....
#user model data
class SubPurchase(models.Model):
...
user = models.ForeignKey(User, null=True, blank=True, on_delete=models.CASCADE)
serializers.py
class SubscriptionSerializer(serializers.ModelSerializer):
class Meta:
model = Subscription
fields =["anyfield you wanna include"]
class SubPurchaseSerializer(serializers.ModelSerializer):
class Meta:
model = SubPurchase
fields =["anyfield you wanna include"]
class UserInfoSerializer(serializers.ModelSerializer):
subpurchace = SubPurchaseSerializer()
subscription= SubscriptionSerializer() #later included in the fields of this serializer
class Meta:
model = get_user_model()
fields = ('userID','subpurchace', 'subscription', 'username','email', 'name', 'balance', 'emailActivation', 'isSuspended')
read_only_fields = ('userID', 'username','email', 'name', 'balance', 'emailActivation', 'isSuspended')
我正在为一个网站创建休息 APIs,用户可以在其中购买所提供的订阅之一。
本网站有一个用户信息 API,其中 return 是有关登录用户的信息,可用于在网站上显示他们的信息。 问题是,提到的 API 的序列化程序是“用户”模型上的 modelSerializer,而我想要 return 的信息是“订阅”模型的实例,它是“的最新实例” SubPurchase”模型指的是。
这些是我的序列化程序、模型和 views.And 我需要以某种方式 return 用户当前订阅的 ID 和名称以及用户信息。如果还有什么问题,可以在评论里问我,我会一一解答。
# models.py
class User(AbstractBaseUser, PermissionsMixin):
userID = models.AutoField(primary_key=True)
username = models.CharField(max_length=100, unique=True, validators=[RegexValidator(regex="^(?=[a-z0-9._]{5,20}$)(?!.*[_.]{2})[^_.].*[^_.]$")])
email= models.EmailField(max_length=100, unique=True, validators=[EmailValidator()])
name = models.CharField(max_length=100)
isSuspended = models.BooleanField(default=False)
isAdmin = models.BooleanField(default=False)
emailActivation = models.BooleanField(default=False)
balance = models.IntegerField(default=0)
objects = UserManager()
USERNAME_FIELD = 'username'
class Subscription(models.Model):
subID = models.AutoField(primary_key=True)
nameOf = models.CharField(max_length=50)
price = models.PositiveIntegerField()
salePercentage = models.PositiveIntegerField(default=0)
saleExpiration = models.DateTimeField(default=datetime.datetime.now, blank=True)
def __str__(self):
return f"{self.nameOf}"
class SubPurchase(models.Model):
price = models.PositiveIntegerField()
dateOf = models.DateTimeField(auto_now_add=True)
user = models.ForeignKey(User, null=True, on_delete=models.SET_NULL)
subscription = models.ForeignKey(Subscription, null=True, on_delete=models.SET_NULL)
def __str__(self):
return self.subscription
# serializers.py
class UserInfoSerializer(serializers.ModelSerializer):
class Meta:
model = get_user_model()
fields = ('userID', 'username','email', 'name', 'balance', 'emailActivation', 'isSuspended')
read_only_fields = ('userID', 'username','email', 'name', 'balance', 'emailActivation', 'isSuspended')
# views.py
class UserInfoViewSet(viewsets.ModelViewSet):
queryset = get_user_model().objects.all()
serializer_class = UserInfoSerializer
def get_queryset(self):
uID = getattr(self.request.user,'userID')
return get_user_model().objects.filter(userID=uID)
def get_object(self):
uID = getattr(self.request.user,'userID')
return self.queryset.filter(userID=uID)
同样,我需要更改 UserInfoSerializer 以提供用户当前订阅的名称、ID 和到期日期(即购买日期后 30 天)
如果您只对返回的数据感兴趣,您可以覆盖序列化程序的函数 to_representation
并为相关模型创建一个序列化程序。如果我没理解错的话,您用户的当前订阅是最后一个(如果按“dateOf”排序)。所以类似的东西可以解决问题
class SubscriptionSerializer(serializers.ModelSerializer):
class Meta:
model = Subscription
fields = ('nameOf', 'id', 'saleExpiration ')
class UserInfoSerializer(serializers.ModelSerializer):
class Meta:
model = get_user_model()
fields = ('userID', 'username','email', 'name', 'balance', 'emailActivation', 'isSuspended')
read_only_fields = ('userID', 'username','email', 'name', 'balance', 'emailActivation', 'isSuspended')
def to_representation(self, instance):
data = super().to_representation(instance)
current_subs = instance.subpurchase_set.order_by('dateOf').last().subscription
data['current_subscription'] = SubscriptionSerializer(instance=current_subs).data
return data
您可以使用 NestedSerializers
来实现您正在寻找的东西
基本上,嵌套序列化是一种方法,您可以在其中 return、创建、放入...,从另一个模型进入模型,它是这样的..
models.py
class User(AbstractBaseUser, PermissionsMixin):
....
#user model data
class SubPurchase(models.Model):
...
user = models.ForeignKey(User, null=True, blank=True, on_delete=models.CASCADE)
serializers.py
class SubscriptionSerializer(serializers.ModelSerializer):
class Meta:
model = Subscription
fields =["anyfield you wanna include"]
class SubPurchaseSerializer(serializers.ModelSerializer):
class Meta:
model = SubPurchase
fields =["anyfield you wanna include"]
class UserInfoSerializer(serializers.ModelSerializer):
subpurchace = SubPurchaseSerializer()
subscription= SubscriptionSerializer() #later included in the fields of this serializer
class Meta:
model = get_user_model()
fields = ('userID','subpurchace', 'subscription', 'username','email', 'name', 'balance', 'emailActivation', 'isSuspended')
read_only_fields = ('userID', 'username','email', 'name', 'balance', 'emailActivation', 'isSuspended')