问题
I am using Django and I am trying when a button is clicked to get data from the database and fill a form with them through AJAX.
I get the error TypeError: Object of type 'EditProductForm' is not JSON serializablefrom the edit_product_view in my views.py
Below is the code I am working with:
-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">×</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">×</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'])
}
})
}
What happens is that when I click <button onclick="findMyForm({{ product.pk }})">Update product</button> the function findMyForm({{ product.pk }}) runs.
Then a get request is called on '/product/' + productKey + '/edit/' through AJAX, based on the urls.py and views.py, edit_product_view is called to pass the form which is filled with the appropriate data.
At this point, it says that TypeError: Object of type 'EditProductForm' is not JSON serializable. I can't figure it out.
回答1:
The object 'EditProductForm' is not JSON serializable, what you need is to return the form as HTML str, change your views.py:
from
return JsonResponse({'form': form})
to
return HttpResponse(form.as_p()) # return form as html str
来源：https://stackoverflow.com/questions/46396494/why-the-form-is-not-json-serializable