Question

我能够将表单呈现到html，输入数据并提交它，但我得到了NOT NULL约束失败。如我在意见中所述，是不是所有者已分配给其各自所有者？我不知道这里有什么问题请帮忙！

<小时/> 的模型

class Car(models.Model):
    owner = models.ForeignKey('auth.User', on_delete=models.CASCADE)
    name = models.CharField(max_length=100)
    model = models.CharField(max_length=100)
    description = models.TextField()
    image = models.ImageField(upload_to=upload_image_path, null=True, blank=True)
    created = models.DateField(auto_now_add=True)
    updated = models.DateField(auto_now_add=False)
    mileage = models.IntegerField()
    open_market_value = models.DecimalField(max_digits=12, decimal_places=2)
    depreciation = models.DecimalField(max_digits=10, decimal_places=2)
    down_payment = models.DecimalField(max_digits=10, decimal_places=2)
    road_tax = models.DecimalField(max_digits=8, decimal_places=2)
    installment = models.DecimalField(max_digits=8, decimal_places=2)
    objects = models.Manager()

    def __str__(self):
        return self.name

视图

class CarCreate(CreateView):
    model = Car
    fields = [
        'name', 'model', 
        'description', 'image', 
        'updated', 'mileage', 
        'open_market_value', 'depreciation', 
        'down_payment', 'road_tax', 
        'installment']
    template_name = 'cars/create_car.html'

    def form_valid(self, form):
        form.instance.created_by = self.request.user
        return super().form_valid(form)

HTML

{% extends 'base.html' %}
{% load crispy_forms_tags %}
{% block content %}

    <!-- Default form contact -->
<form action="{% url 'cars:create' %}" method="post" enctype="multipart/form-data">
   {% csrf_token %}
   {{form | crispy}}
    <input type="submit" value="save">
</form>
<!-- Default form contact -->
{% endblock %}

Answer 1

这很可能是因为owner是模型Car中的必填字段，但您尚未将其包含在fields的{{1}}中。

Answer 2

您的模型具有来自＆＃39; django.auth＆＃39;的用户模型的外键。当你试图保存＆＃39; Car＆＃39;模型，因为没有提到“＆＃39;所有者”的对象。模型的字段，它显示错误。所以，您可能希望明确提及它。

你可以这样做。假设您有“CarForm”，那么您的模型表格就是Car＆＃39; Car＆＃39;模型。

user = request.user
car_form = CarForm(request.POST)

if car_form.is_valid():
    car = car_form.save(False)
    car.owner = user
    car.save()

NOT NULL约束失败：cars_car.owner_id

2 个答案: