我有三个模型,分别命名为Smoker,Switch,Survey。我将Smoker作为Switch模型的外键,而将switch作为Survey模型的外键
class Smoker(models.Model):
first_name = models.CharField(max_length=50, blank=True, null=True)
last_name = models.CharField(max_length=50, blank=True, null=True)
mobile = models.IntegerField(null=True, blank=True)
gender = models.BooleanField(blank=True, null=True)
age = models.ForeignKey(Age,models.DO_NOTHING,blank=True, null=True)
occupation = models.ForeignKey(Occupation, models.DO_NOTHING, blank=True, null=True)
class Switch(models.Model):
time = models.TimeField(blank=True, null=True)
count_outers = models.IntegerField(blank=True, null=True)
count_packs = models.IntegerField(blank=True, null=True)
smoker = models.ForeignKey(Smoker, models.DO_NOTHING, blank=True, null=True)
new_brand = models.ForeignKey(NewBrand, models.DO_NOTHING, blank=True, null=True)
new_sku = models.ForeignKey(NewSku, models.DO_NOTHING, blank=True, null=True)
# def __str__(self):
# return self.time.strftime("%H:%M")
class Survey(models.Model):
user = models.ForeignKey(User, models.DO_NOTHING, blank=True, null=True)
date = models.DateField(null=True, blank=True)
bool_switch = models.BooleanField(null=True, blank=True)
reason = models.ForeignKey(Reason, models.DO_NOTHING, null=True, blank=True)
shift = models.ForeignKey(ShiftingTime, models.DO_NOTHING, null=True, blank=True)
current_brand = models.ForeignKey(CurrentBrand, models.DO_NOTHING, null=True, blank=True)
current_sku = models.ForeignKey(CurrentSku, models.DO_NOTHING, null=True, blank=True)
pos = models.ForeignKey(Pos, models.DO_NOTHING, null=True, blank=True)
switch = models.ForeignKey(Switch, models.DO_NOTHING, null=True, blank=True)
这里有我的序列化器:
class SmokerSerializer(serializers.ModelSerializer):
class Meta:
model = Smoker
fields = '__all__'
class SwitchSerializer(serializers.ModelSerializer):
smoker = SmokerSerializer()
class Meta:
model = Switch
fields = '__all__'
def create(self, validated_data):
smoker_data = validated_data.pop('smoker', None)
if smoker_data:
smoker = Smoker.objects.create(**smoker_data)
validated_data['smoker'] = smoker
return Switch.objects.create(**validated_data)
class SurveySerializer(serializers.ModelSerializer):
switch = SwitchSerializer()
class Meta:
model = Survey
fields = '__all__'
def create(self, validated_data):
switch_data = validated_data.pop('switch', None)
if switch_data:
switch = Switch.objects.create(**switch_data)
validated_data['switch'] = switch
return Survey.objects.create(**validated_data)
我为创建和列出所有调查表做了一个通用名称
class SurveyCreateAPIView(generics.ListCreateAPIView):
def get_queryset(self):
return Survey.objects.all()
serializer_class = SurveySerializer
对于每个显示的调查,我必须显示与之相关的开关数据,并且在开关对象内部,我需要在其中显示吸烟者对象,因此每个调查对象必须看起来像这样
{
"id": 11,
"switch": {
"id": 12,
"smoker": {
"firstname":"sami",
"lastname:"hamad",
"mobile":"7983832",
"gender":"0",
"age":"2",
"occupation":"2"
},
"time": null,
"count_outers": 5,
"count_packs": 7,
"new_brand": 2,
"new_sku": 2
},
"date": "2018-12-08",
"bool_switch": true,
"user": 7,
"reason": 3,
"shift": 2,
"current_brand": 6,
"current_sku": 4,
"pos": 2
},
但是当我发出POST请求时,它给了我这个错误
/ api / v2 / surveysync /处的ValueError /无法分配 “ OrderedDict([('first_name','aline'),('last_name','youssef'), ('mobile',7488483),('gender',False),('age',), ('occupation',)])“”:“ Switch.smoker”必须为 一个“吸烟者”实例。
所以请帮助并非常感谢您!
答案 0 :(得分:1)
您走的路是正确的,但是您是在手动保存开关对象,而不是允许SwitchSerializer
为您这样做。与开关序列化器中的create方法相同。应该是这样的:
class SmokerSerializer(serializers.ModelSerializer):
class Meta:
model = Smoker
fields = '__all__'
class SwitchSerializer(serializers.ModelSerializer):
smoker = SmokerSerializer()
class Meta:
model = Switch
fields = '__all__'
def create(self, validated_data):
smoker_data = validated_data.pop('smoker', None)
if smoker_data:
serializer = SmokerSerializer(data=smoker_data, context=self.context)
if serializer.is_valid():
validated_data['smoker'] = serializer.save()
return super().create(validated_data)
class SurveySerializer(serializers.ModelSerializer):
switch = SwitchSerializer()
class Meta:
model = Survey
fields = '__all__'
def create(self, validated_data):
switch_data = validated_data.pop('switch', None)
if switch_data:
serializer = SwitchSerializer(data=switch_data, context=self.context)
if serializer.is_valid():
validated_data['switch'] = serializer.save()
return super().create(validated_data)
答案 1 :(得分:0)
在SwitchSerializer
中,您将create
函数定义为内部Meta
类的方法,而不是SwitchSerializer
类的成员。试试这个
class SwitchSerializer(serializers.ModelSerializer):
smoker = SmokerSerializer()
class Meta:
model = Switch
fields = '__all__'
def create(self, validated_data):
smoker_data = validated_data.pop('smoker', None)
if smoker_data:
smoker = Smoker.objects.create(**smoker_data)
validated_data['smoker'] = smoker
return Switch.objects.create(**validated_data)