从 React 向 Django Rest 框架发送数据时发生内部服务器错误 500

Question

我正在制作一个作物预测系统，用户将一些数据发送到后端，crop_prediction函数将预测作物并将其发送到前端以显示它。 我检查了views.py 函数，它在 Django Rest 框架上正常工作。 但发送数据时出现内部服务器错误。 请对我的代码提出任何修改建议。

我发送数据的前端代码

async function userDataHandler(userData) {
    const response = await fetch("http://localhost:8000/Efarma/", {
      method: "POST",
      body: JSON.stringify(userData),
      headers: {
        "Content-Type": "application/json",
      },
    });

    const data = await response.json();
  }

Django查看代码：-

from django.shortcuts import render
from firebase import firebase
import numpy as np 
# from rest_framework.parsers import JSONParses
from django.views.decorators.csrf import csrf_exempt
import pickle
from efarma import config
from rest_framework.response import Response
from rest_framework.views import APIView
from rest_framework.decorators import api_view, renderer_classes
from rest_framework.renderers import JSONRenderer, TemplateHTMLRenderer
from rest_framework import permissions
from rest_framework.decorators import api_view, permission_classes

def weather_fetch(city_name):
    """
    Fetch and returns the temperature and humidity of a city
    :params: city_name
    :return: temperature, humidity
    """
    api_key = config.weather_api_key
    base_url = "http://api.openweathermap.org/data/2.5/weather?"

    complete_url = base_url + "appid=" + api_key + "&q=" + city_name
    response = requests.get(complete_url)
    x = response.json()

    if x["cod"] != "404":
        y = x["main"]

        temperature = round((y["temp"] - 273.15), 2)
        humidity = y["humidity"]
        return temperature, humidity
    else:
        return None

@api_view(('POST','GET',))
@permission_classes((permissions.AllowAny,))
def crop_prediction(request):
    permission_classes = [permissions.IsAuthenticated]
    if request.method == 'POST':
        N = float(request.form['nitrogen'])
        P = float(request.form['phosphorous'])
        K = float(request.form['pottasium'])
        ph = float(request.form['ph'])
        rainfall = float(request.form['rainfall'])
        city = request.form.get("city")

        if weather_fetch(city) != None:
            temperature, humidity = weather_fetch(city)
            data = np.array([[N, P, K, temperature, humidity, ph, rainfall]])
            my_prediction = pickle.load(open('cropRecommendationBackend\\model\\model.pkl','rb'))
            final_prediction=my_prediction.predict(data)
            value=final_prediction[0]
            firebase =firebase.FirebaseApplication('https://e-farma-5dc42-default-rtdb.firebaseio.com/')
            result=firebase.get(final_prediction,None)
            return Response(result)
        
        else: return Response("Some error occured")
    else: return Response("Some error occured")

Settings.py 文件：-

from pathlib import Path

# Build paths inside the project like this: BASE_DIR / 'subdir'.
BASE_DIR = Path(__file__).resolve().parent.parent


# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/3.1/howto/deployment/checklist/

# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = '6o=k+7ec442!!jxbtwu9q-+fb%l=1t6o0z2f!(-qpm1!4a@pl^'

# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = True


# Application definition

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'corsheaders',
    'efarma',
    'rest_framework',
]

CORS_ORIGIN_ALLOW_ALL = True

CORS_ORIGIN_WHITELIST = [
     'http://localhost:3000'
]

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
    'corsheaders.middleware.CorsMiddleware',
]

REST_FRAMEWORK = {
    # Use Django's standard `django.contrib.auth` permissions,
    # or allow read-only access for unauthenticated users.
    'DEFAULT_PERMISSION_CLASSES': [
        'rest_framework.permissions.DjangoModelPermissionsOrAnonReadOnly'
    ]
}

ROOT_URLCONF = 'cropRecommendationBackend.urls'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [],
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
]

WSGI_APPLICATION = 'cropRecommendationBackend.wsgi.application'


# Database
# https://docs.djangoproject.com/en/3.1/ref/settings/#databases

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': BASE_DIR / 'db.sqlite3',
    }
}


# Password validation
# https://docs.djangoproject.com/en/3.1/ref/settings/#auth-password-validators

AUTH_PASSWORD_VALIDATORS = [
    {
        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
    },
]


# Internationalization
# https://docs.djangoproject.com/en/3.1/topics/i18n/

LANGUAGE_CODE = 'en-us'

TIME_ZONE = 'UTC'

USE_I18N = True

USE_L10N = True

USE_TZ = True


# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/3.1/howto/static-files/

STATIC_URL = '/static/'

Answer 1

if x["cod"] != "404":

正确吗？我不确定，但看起来像是“鳕鱼”

中的拼写错误