查詢Django中的外鍵數據

Question

我正在查詢我的數據庫並檢索字段的所有實數值。 而是我正在獲取外鍵id值。 任何人都可以幫忙嗎？

這裏是我的models.py：

class Respondant(models.Model): 
Respond_Id = models.IntegerField(null=True) 
Gender  = models.TextField(null=True) 
Age   = models.TextField(null=True) 
Country  = models.ForeignKey(Country, related_name="respondant_Country") 
Theme   = models.ForeignKey(Question, related_name="respondant_Theme") 
Question  = models.ForeignKey(Question, related_name="respondant_Question") 
def __str__(self): 
    return " Respondant:{} ".format(self.Respond_Id) 

的RespondantSerializer：

class RespondantSerializer (serializers.ModelSerializer): 
class Meta: 
    model = Respondant 
    fields=('Respond_Id' ,'Gender' , 'Age', 'Answer') 

我的查詢中api.py設置：

class Theme1Api(ListAPIView): 
queryset = Respondant.objects.filter(Theme=1) 
serializer_class = RespondantSerializer 
name = 'theme1' 

def get_queryset(self, *args, **kwargs): 
    Country = self.kwargs['Country'] 
    Question = self.kwargs['Question'] 
    return Respondant.objects.filter(Theme=1).filter(Question=Question).filter(Country=Country) 

這裏是一個輸出：

[{"Respond_Id": 258, "Gender": "Female", "Age": "18-21", "Answer": 424}, 
    {"Respond_Id": 258, "Gender": "Female", "Age": "18-21", "Answer": 428}] 

Answer 1

由於您使用的是ModelSerializer，因此您可以使用depth選項獲取關係的嵌套表示。

class RespondantSerializer (serializers.ModelSerializer): 
    class Meta: 
     model = Respondant 
     fields=('Respond_Id' ,'Gender' , 'Age', 'Answer') 
     depth = 1 

這裏http://www.django-rest-framework.org/api-guide/serializers/#specifying-nested-serialization

更多細節。如果你想要更多的控制權，你可以創建一個AnswerSerializer並使用它

class RespondantSerializer (serializers.ModelSerializer): 
    Answer = AnswerSerializer() 

    class Meta: 
     model = Respondant 
     fields=('Respond_Id' ,'Gender' , 'Age', 'Answer') 

或者，如果你只是想從Answer對象的值，你可以使用SerializerMethodField，這裏有更多的信息http://www.django-rest-framework.org/api-guide/fields/#serializermethodfield

class RespondantSerializer (serializers.ModelSerializer): 
    Answer = SerializerMethodField() 

    class Meta: 
     model = Respondant 
     fields=('Respond_Id' ,'Gender' , 'Age', 'Answer') 

    def get_Answer(self, obj): 
     # get your value from obj.Answer 
     return obj.Answer.<your_value>