为什么表单不是JSON可序列化的？

Question

我正在使用Django，当我点击一个按钮以从数据库获取数据并通过AJAX填充表单时，我正在尝试。

我从edit_product_view错误TypeError: Object of type 'EditProductForm' is not JSON serializable我views.py

下面是代码我一起工作：

-urls.py

from django.conf.urls import url 
from . import views 

app_name = "products" 
urlpatterns = [url(r'^products', views.ProductsView.as_view(), name="products"), 
       url(r"^product/new", views.add_new_product_view, name="add_new_product"), 
       url(r"^product/(?P<id>[0-9]+)/edit/", views.edit_product_view, name="edit_product")] 

-views.py

from django.views.generic import DetailView, ListView, TemplateView 
from django.http import JsonResponse 
from django.shortcuts import render, get_object_or_404 
from . import models 
from products.forms import AddNewProductForm, EditProductForm 


def index(request): 
    return render(request, 'products/products.html') 


class ProductsView(ListView): 
    context_object_name = "products" 
    model = models.Product 
    template_name = "products/products.html" 
    form = AddNewProductForm() 

    def get_context_data(self, **kwargs): 
     context = super(ProductsView, self).get_context_data(**kwargs) 
     context["products"] = models.Product.objects.all().order_by("title") 
     context["form"] = self.form 
     return context 


def add_new_product_view(request): 
    if request.method == "POST": 
     form = AddNewProductForm(request.POST) 
     if form.is_valid(): 
      form.save(commit=True) 
      return JsonResponse({'msg': 'Data saved'}) 
     else: 
      print("ERROR FORM INVALID") 
      return JsonResponse({'msg': 'ERROR FORM INVALID'}) 
    else: 
     form = AddNewProductForm() 

    return JsonResponse({'form': form}) 


def edit_product_view(request, id): 
    print(request.method) 
    instance = get_object_or_404(models.Product, id=id) 
    form = EditProductForm(instance=instance) 
    if request.method == "POST": 
     form = EditProductForm(request.POST, instance=instance) 

     if form.is_valid(): 
      form.save(commit=True) 
      return JsonResponse({'form': form}) 
     else: 
      print("ERROR FORM INVALID") 

    return JsonResponse({'form': form}) 

-products.html

{% extends "products/base.html" %} 
{% load static %} 

{% block title %}My Products{% endblock %} 

{% block content %} 

    <div class="container" id="my-products-table-container"> 
     <h2 class="text-left caption">Add, view and edit products</h2> 
     <hr> 
     <table class="table table-striped table-sm table-bordered" id="my-products-table"> 
      <thead class="thead-inverse"> 
       <tr class="head-row"> 
        <th>Title</th> 
        <th>Description</th> 
        <th>Year</th> 
        <th>Manufacturer</th> 
      </thead> 

      <tbody> 
       {% for product in products %} 
        <tr class="table-row"> 
        <td>{{ product.title }}</td> 
        <td>{{ product.description }}</td> 
        <td>{{ product.year_manufactured }}</td> 
        <td>{{ product.manufacturer }}</td> 
        <td><button type="button" class="btn btn-primary" data-toggle="modal" data-target="#addNewProductModalForm">Add New product</button></td> 
        <td><button onclick="findMyForm({{ product.pk }})">Update product</button></td> 
       {% endfor %} 
      </tbody> 
     </table> 
    </div> 
      <!-- Modal Add New Product--> 
      <div class="modal fade" id="addNewProductModalForm" tabindex="-1" role="dialog" aria-labelledby="addNewProductModalFormLabel" aria-hidden="true"> 
       <div class="modal-dialog" role="document"> 
       <form class="form" id="add_new_product_form"> 
        <div class="modal-content"> 
         <div class="modal-header"> 
         <h5 class="modal-title" id="addNewProductModalFormLabel">Add New Product</h5> 
         <button type="button" class="close" data-dismiss="modal" aria-label="Close"> 
          <span aria-hidden="true">&times;</span> 
         </button> 
         </div> 
         <div class="modal-body"> 
         {% csrf_token %} 
         {{ form.as_p }} 
         </div> 
         <div class="modal-footer"> 
         <button type="button" class="btn btn-secondary" onclick="addNewProduct()">Submit</button> 
         </div> 
        </div> 
       </form> 
       </div> 
      </div> 


      <!-- Modal Edit--> 
      <div class="modal fade" id="editProductModalForm" tabindex="-1" role="dialog" aria-labelledby="editProductModalFormLabel" aria-hidden="true"> 
       <div class="modal-dialog" role="document"> 
       <form class="form" id="edit_product_form" > 
        <div class="modal-content"> 
         <div class="modal-header"> 
         <h5 class="modal-title" id="editProductModalFormLabel">Edit Product</h5> 
         <button type="button" class="close" data-dismiss="modal" aria-label="Close"> 
          <span aria-hidden="true">&times;</span> 
         </button> 
         </div> 
         <div class="modal-body"> 
          {% csrf_token %} 
          <div id='showForm'></div> 
         </div> 
         <div class="modal-footer"> 
         <input type="submit" class="btn btn-primary" value="Submit!"> 
         </div> 
        </div> 
       </form> 
       </div> 
      </div> 


<!-- JS Scripts --> 
<script src="{% static "products/js/addProduct.js" %}"></script> 
<script> 
    function findMyForm(productKey) { 
     $('#editProductModalForm').modal('show'); 
     $.ajax({ 
      type: 'GET', 
      url: '/product/' + productKey + '/edit/', 
      success: function(res) { 
      $("#showForm").html(res); 
     } 
     })} 
</script> 
{% endblock %} 

-addProduct.js

function addNewProduct(e) { 
    var addNewProductForm = $("#add_new_product_form"); 
    $.ajax({ 
     type: 'POST', 
     url: '/product/new/', 
     data: addNewProductForm.serialize(), 
     success: function(res){ 
      alert(res['msg']) 
     } 
    }) 
} 

什么情况是，当我点击<button onclick="findMyForm({{ product.pk }})">Update product</button>功能findMyForm({{ product.pk }})运行。

然后获取请求通过AJAX调用上'/product/' + productKey + '/edit/'，基于所述urls.py和views.py,edit_product_view被称为通过填充有适当的数据形式。

在这一点上，它说，TypeError: Object of type 'EditProductForm' is not JSON serializable。我无法弄清楚。

Answer 1

对象 'EditProductForm' 不是JSON序列化的，你需要的是return the form as HTML str，改变你的views.py：

从

return JsonResponse({'form': form}) 

到

return HttpResponse(form.as_p()) # return form as html str