Question

我有一个看起来像这样的django模型：

class AcademicProgramsManager(models.Manager):
    def get_by_natural_key(self, acad_program_id, program_title, required_credits):
        return self.get(acad_program_id = acad_program_id, program_title = program_title, required_credits = required_credits)

class AcademicPrograms(models.Model):

    objects = AcademicProgramsManager()
    acad_program_id = models.IntegerField(primary_key=True)
    acad_program_category = models.ForeignKey(AcademicProgramCategories)
    acad_program_type = models.ForeignKey(AcademicProgramTypes)
    acad_program_code = models.CharField(max_length=25)
    program_title = models.CharField(max_length=64)
    required_credits = models.IntegerField()
    min_gpa = models.FloatField()
    description = models.CharField(max_length=1000)

    def natural_key(self):
        return (self.acad_program_id, self.program_title, self.required_credits)

class StudentAcademicPrograms(models.Model):
    student = models.ForeignKey(Students)
    academic_program = models.ForeignKey(AcademicPrograms)
    credits_completed = models.IntegerField()
    academic_program_gpa = models.FloatField()
    primary_program = models.BooleanField()

这是我的serializers.py文件：

from studentapp.models import AcademicPrograms, AcademicProgramsManager, StudentAcademicPrograms
from rest_framework import serializers

class StudentAcademicProgramsSerializer(serializers.ModelSerializer):
    class Meta:
        model = StudentAcademicPrograms
    fields = ('credits_completed','academic_program_gpa','primary_program')

class AcademicProgramsSerializer(serializers.ModelSerializer):
    studentacademicprograms = StudentAcademicProgramsSerializer(many = True)

    class Meta:
        model = AcademicPrograms
        fields = ('acad_program_id','program_title','required_credits','studentacademicprograms')

我的api.py文件如下所示：

from studentapp.models import AcademicPrograms, AcademicProgramsManager, StudentAcademicPrograms
from studentapp.serializers import StudentAcademicProgramsSerializer, AcademicProgramsSerializer
from django.http import Http404
from rest_framework.views import APIView
from rest_framework.response import Response

class AcademicProgramsList(APIView):
    def get(self, request, format=None):
        academicprograms = AcademicPrograms.objects.all()
        serialized_academicprograms = AcademicProgramsSerializer(academicprograms, many=True)
        return Response(serialized_academicprograms.data)

class AcademicProgramsDetail(APIView):

    def get_onjects(self, pk):
        try:
            return AcademicPrograms.object.get(pk=pk)
        except AcademicPrograms.DoesNotExist:
            raise Http404

    def get(self, request, pk, format=None):
        academicprogram = self.get_object(pk)
        serialized_academicprogram = AcademicProgramsSerializer(academicprogram)
        return Response(serialized_academicprogram.data)

最后是我的网址：

from django.conf.urls import patterns, include, url
from rest_framework.urlpatterns import format_suffix_patterns
from studentapp import api

from django.contrib import admin
admin.autodiscover()

urlpatterns = patterns('',
    # Examples:
    # url(r'^$', 'texascompletes.views.home', name='home'),
    # url(r'^blog/', include('blog.urls')),

    #API:
    url(r'^api/studentacademicprograms/$', api.AcademicProgramsList.as_view()),
    url(r'^api/studentacademicprograms/(?P<pk>[0-9]+)/$', api.AcademicProgramsDetail.as_view()),

    url(r'^admin/', include(admin.site.urls)),
)

urlpatterns = format_suffix_patterns(urlpatterns)

当我给出api / studentacademicprograms时，我收到以下错误

'AcademicPrograms' object has no attribute 'studentacademicprograms'

我哪里错了？

Answer 1

尝试将source设置为模型上的属性/方法名称。例如：

studentacademicprograms = StudentAcademicProgramsSerializer(
    many=True, 
    source='studentacademicprograms_set')

Django Rest Framework Serializer relations docs中给出的示例在模型上设置了与序列化程序中的属性名称匹配的相关名称（默认值）。如果名称不匹配，则需要指定要使用的模型的源方法/属性。

Django休息框架序列化错误

1 个答案: