Django REST框架上传图片时出错，提交的数据不是文件

Question

I am new to Django rest framework and when ever I try to do post request via Postman and python script itself it shows error

{'bloodbank_logo': ['The submitted data was not a file. Check the encoding type on the form.']}

But there is no error when I try to post image using django admin.

my models.py

from django.db import models
from django.conf import settings
from django.contrib.auth.models import User

# Create your models here.

class Bloodbanks(models.Model):
    bloodbank_user=models.ForeignKey(User, on_delete=models.CASCADE)
    fullbankname=models.CharField(max_length=80,blank=False,default='Null')
    apositive=models.PositiveIntegerField()
    anegative=models.PositiveIntegerField()
    bpositive=models.PositiveIntegerField()
    bnegative=models.PositiveIntegerField()
    abpositive=models.PositiveIntegerField()
    abnegative=models.PositiveIntegerField()
    opositive=models.PositiveIntegerField()
    onegative=models.PositiveIntegerField()
    latitude=models.CharField(max_length=20,blank=False,default='Null')
    longitude=models.CharField(max_length=20,blank=False,default='Null')
    state = models.CharField(max_length=100)
    district=models.CharField(max_length=20,blank=False,default='Null')
    location=models.CharField(max_length=20,blank=False,default='Null')
    website = models.CharField(max_length=100, blank=True)
    bloodbank_logo=models.ImageField(blank=False)
    bloodbank_description=models.CharField(blank=True,max_length=200)
    bloodbank_phone=models.CharField(blank=True,max_length=10)


    def __str__(self):  
        return self.fullbankname

my serializers.py

from rest_framework import serializers,reverse
from bloodbank_api.models import Bloodbanks


class BloodbankdataSerializer(serializers.ModelSerializer):
    bloodbanks_user=serializers.PrimaryKeyRelatedField(source='user.username',read_only=True)
    url = serializers.HyperlinkedIdentityField(
        view_name='bloodbank-detail-id',
        lookup_field='pk'
    )
    bloodbank_logo=serializers.ImageField
    
    class Meta:
        model=Bloodbanks
        fields=['id','bloodbanks_user','fullbankname','apositive',
                'anegative','bpositive','bnegative','abpositive',
                'abnegative','opositive','onegative','latitude',
                'longitude','state','district','location','website',
                'bloodbank_logo','bloodbank_description','bloodbank_phone','url']
    

views.py

from bloodbank_api.models import Bloodbanks
from bloodbank_api.serializers import BloodbankdataSerializer
from rest_framework import status,mixins,generics
from rest_framework.parsers import FormParser, MultiPartParser,JSONParser
from rest_framework.response import Response
from django.contrib.auth.models import User

  # Create your views here
#updatelistpostput by primary key        
class BloodbankDataDetail(mixins.ListModelMixin,
                        mixins.CreateModelMixin,
                        mixins.RetrieveModelMixin,
                        mixins.UpdateModelMixin,
                        mixins.DestroyModelMixin,
                        generics.GenericAPIView):
    queryset = Bloodbanks.objects.all()
    serializer_class = BloodbankdataSerializer
    parser_class=(MultiPartParser,JSONParser, FormParser) 
    lookup_field = 'pk'
    def get(self, request,*args, **kwargs):
        id=kwargs.get('pk')
        if id is not None:
            return self.retrieve(request,*args, **kwargs)
        return self.list(request, *args, **kwargs)
    def post(self, request, *args, **kwargs):
        print(args,kwargs)
        return self.create(request, *args, **kwargs)

    def perform_create(self, serializer):
        serializer.save(bloodbank_user=self.request.user)
    

urls.py

from django.urls import path
from rest_framework.urlpatterns import format_suffix_patterns
from bloodbank_api.views import  BloodbankDataDetail
from django.conf import settings
from django.conf.urls.static import static

urlpatterns=[
    path('bloodbank/',BloodbankDataDetail.as_view(),name='bloodbank-detail'),
    path('bloodbank/<int:pk>/',BloodbankDataDetail.as_view(),name='bloodbank-detail-id'),
]
urlpatterns = format_suffix_patterns(urlpatterns)+ static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)

the python script that i have used to post do post request

import requests
endpoint='http://127.0.0.1:8000/bloodbank/'
data={
    "fullbankname": "Dirgahyu",
    "apositive": '1',
    "anegative": '1',
    "bpositive": '1',
    "bnegative": '1',
    "abpositive": '1',
    "abnegative": '1',
    "opositive": '1',
    "onegative": '1',
    "latitude": "dhdhd",
    "longitude": "hdhdd",
    "state": "dhhd",
    "district": "dhdhgd",
    "location": "dhdhdhd",
    "website": "jdjdjd",
    "bloodbank_logo": "/Users/aayushdipgiri/aayu's code/opencv/cat.jpeg",
    "bloodbank_description": "hahaha",
    "bloodbank_phone": "hhdhddh"
}
get_response = requests.post(endpoint, json=data) 
print(get_response.json())

Answer 1

First thing I notice is that you are not sending an image, you are sending a string. Try this instead to send the file via requests module.

"bloodbank_logo": open("/Users/aayushdipgiri/aayu's code/opencv/cat.jpeg", "rb"),

If this does not work, I would try using django's FileField instead, but I won't go into detail as the above should work or give you a different error message at least.