更新未保存在 django rest 框架中

Question

views.py

def productslist(request):
    products = Products.objects.all()
    context = {'products':products}
    return render(request,'productslist.html',context)

def productsform(request):
    return render(request,'productscreate.html')

def productsupdate(request):
    return render(request,'productsupdate.html')    



def productsAdd(request):
  if request.method == "POST":
        data = request.data
        product = Products()
        product.title = request.POST["title"]
        product.description = request.POST["description"]
        product.image = request.FILES.get("image")  
        product = Products(title=data['title'], description=data['description'], image=data['image'])     
        product.save()
        serializer = Productserialize(product)
        return Response(serializer.data)


def products_list(request):
    if (request.method == 'GET'):
        product = Products.objects.all()
        serializer = Productserialize(product,many=True)
        return Response(serializer.data)



class ProductsDetailView(DetailView):
     template_name = "productsdetail.html"
     queryset = Products.objects.all()
     context_object_name = 'products'
     model = Products
     serializer_class = Productserialize

@api_view(['PUT'])
def productupdate(request,pk):
    data = request.data
    prod = Products.objects.get(id=pk)
    serializer = Productserialize(prod,data=data, many=True)  
    if serializer.is_valid():  
        serializer.save()  
        return Response(serializer.data)
   

detail.html

<form>

      
      
     Title:- {{products.title }} <br><br>
     
     Description:- {{ products.description}}<br><br>

 
     {% if products.image %}
      Image :- <img src="{{products.image.url}}" alt="image"><br><br>
      {% endif %}


 

     <button><a href="/update/{{ products.id}}">Edit</a></button>
    </form>
   

serializer.py

class Productserialize(serializers.Serializer):
    id = serializers.IntegerField(read_only=True)
    title = serializers.CharField(required=False, allow_blank=True, max_length=100)
    description = serializers.CharField(required=False, allow_blank=True, max_length=100)
    image = serializers.FileField()

    def create(self, validated_data):
        """
        Create and return a new `Snippet` instance, given the validated data.
        """
        return Products.objects.create(**validated_data)


    def update(self, instance, validated_data):
        """
        Update and return an existing `Snippet` instance, given the validated data.
        """
        instance.id = validated_data.get('id', instance.id)
        instance.title = validated_data.get('title', instance.title)
        instance.description = validated_data.get('description', instance.description)
        instance.image = validated_data.get('image', instance.image)
        instance.save()
        return instance

update.html

<form method="post" action="/update/{{prod.id}}" enctype="multipart/form-data">
        {% csrf_token %}
        <table>
    <tr>
        <td>Title:<br>
        <input type="text" name="title" id="title" value="{{ prod.title }}"></td>
        <br>
    </tr>
    <tr>
        <td>Description:<br>
        <textarea name="description" id="description" value="{{ prod.description }}">Description</textarea></td>
        <br>
    </tr>
    <tr>
        {% if prod.image %}
        <td>Image:<br>
        <input type="file" name="image" id="image" value="{{prod.image.url}}"></td>
        {% endif %}
        <br>
    </tr>
    
    <tr>
        <td><button type="submit" id="update">Update</button></td>
    </tr>

</table>
</form>

urls.py

urlpatterns = [
     path('', views.index, name="index"),
     path('productlist', views.login, name="login"),
     path('productslist', views.productslist, name='productslist'),
     path('productscreate',views.productsform,name='productscreate'),
     path('productsadd', views.productsAdd, name="productsadd"),
     path('api/', views.products_list, name="products_list"),
     path('<int:pk>', ProductsDetailView.as_view(), name='productsdetail'),
     path('update', views.productsupdate, name="productsupdate"),
     path('update/<str:pk>', views.productupdate, name="productupdate"),
]

更新没有将数据保存到休息框架我不知道是什么问题

当我尝试更新表单数据时没有保存在数据库中，也没有在 api 中显示 我已经给出了 html、views 和 urls.py 我需要用 html 表单更新表单，我想在 api 中显示数据 请帮我解决这个问题 提前致谢

Answer 1

看来您正在更新单个对象。这就是为什么您从 url 获取 pk 的原因。所以你需要的第一个改变是。

@api_view(['PUT'])
def productupdate(request,pk):
    data = request.data
    prod = Products.objects.get(id=pk)
    serializer = Productserialize(prod,data=data, many=True)  
    if serializer.is_valid():  
        serializer.save()  
        return Response(serializer.data)

将 many=True 更改为 many=False。

你也可以发表评论。

def update(self, instance, validated_data):
        """
        Update and return an existing `Snippet` instance, given the validated data.
        """
        instance.id = validated_data.get('id', instance.id)
        instance.title = validated_data.get('title', instance.title)
        instance.description = validated_data.get('description', instance.description)
        instance.image = validated_data.get('image', instance.image)
        instance.save()
        return instance

来自您的序列化程序。因为您的视图已经在处理更新逻辑..