django，在保存到数据库之前更改模型中的字段值

Question

类 PlayerList(models.Model):name = models.CharField(max_length=300)position = models.CharField(max_length=200)h_code = models.ForeignKey(HList, related_name="h_code", on_delete=models.CASCADE)d_code = models.CharField(primary_key=True, max_length = 200, editable=False)Serializers.pyclass PlayerSerializer(serializers.ModelSerializer):        class Meta:        fields = ["name", "position", "h_code", "d_code"]        model = PlayerListview.pyclass PostPlayer(generics.ListCreateAPIView):    queryset = PlayerList.objects.all().order_by('-d_code')    serializer_class = PlayerListSerializer    def get(self, request, *args, **kwargs):        d_code = request.data.get('h_code') + 'test'        print(d_code)打印（d_code）：h000001test当通过api输入一个值时，我想实现将输入的值更改为view.py中的另一个值并保存在db中。我想将 def get 处理的 d_code 保存在 db 中。我不知道该怎么办。你能告诉我吗？没有答案，所以我会再次发帖。

Answer 1

您可以重写您的视图perform_create()方法，如文档中所述（您可能需要稍微滚动一下，它位于“保存和删除挂钩”部分中：

class PostPlayer(generics.ListCreateAPIView):

    queryset = PlayerList.objects.all().order_by('-d_code')

    serializer_class = PlayerListSerializer

    def get(self, request, *args, **kwargs):

        d_code = request.data.get('h_code') + 'test'

        print(d_code)

    ...

    ...

    def perform_create(self, serializer):

        d_code = request.data.get('h_code') + 'test'

        #do something with d_code

        new_code = d_code + 'someSampleValue'

        serializer.save(d_code=new_code)