python - 查看函数: saving a form field value into the profile model attribute

Question

我正在 django 应用程序“colortest”中为我的 View 函数编写代码，我的配置文件模型位于 django 应用程序“users”中。我想将表单字段数据添加到配置文件模型属性中。当我保存变量时，我收到一个 IntegrityError

我搜索了每个网站，但我无法理解

colortest/views.py

    from users.models import Profile
def testreport(request):
    if request.method == "POST":
        test_result = request.POST.get('test_result')
        p = Profile(user=request.user, test_result=test_result)
        p.save()
        messages.success(request, f'Your account has been Updated!')
        return render(request, 'colortest/test1.html')
    return render(request, 'colortest/result.html')

users/models.py

class Profile(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)
    image = models.ImageField(default='default.jpg', upload_to='profile_pics')
    bio = models.TextField(max_length=1000, default="")
    test_result = models.CharField(max_length=100, default="")


    def __str__(self):
        return f'{self.user.username} Profile'

    def save(self, *args, **kwargs):
        super(Profile, self).save(*args, **kwargs)

        img = Image.open(self.image.path)
        if img.height > 300 or img.width > 300:
            output_size = (300, 300)
            img.thumbnail(output_size)
            img.save(self.image.path)

我希望将数据保存在配置文件模型的 test_result 字段中但它一直给出错误

IntegrityError at /colortest/result/testreport
UNIQUE constraint failed: users_profile.user_id
Request Method: POST
Request URL:    http://127.0.0.1:8000/colortest/result/testreport
Django Version: 2.2.1
Exception Type: IntegrityError
Exception Value:    
UNIQUE constraint failed: users_profile.user_id

C:\Users\Osama E.Khan\Desktop\website\colortest\views.py in testreport
        p.save() …
▶ Local vars
C:\Users\Osama E.Khan\Desktop\website\users\models.py in save
        super(Profile, self).save(*args, **kwargs) 

Answer 1

您正尝试在每次保存表单时创建新的配置文件。这是哪一行:

p = Profile(user=request.user, test_result=test_result)

这将每次创建该配置文件的一个新实例。您需要更改该行以检查配置文件是否已存在。重新使用现有配置文件或创建新配置文件后，如果配置文件不存在，您将需要根据该配置文件保存最新的测试结果，或者重新建模其保存方式，以便每次将新的测试结果保存到配置文件中

更新

如果您想更新到最新值，您可以尝试获取最新值并更新它:

def testreport(request):
    if request.method == "POST":
        test_result = request.POST.get('test_result')
        try:
            p = request.user.profile
        except Profile.DoesNotExist:
            p = Profile(user=request.user, test_result=test_result)
        p.test_result = test_result
        p.save()
        messages.success(request, f'Your account has been Updated!')
        return render(request, 'colortest/test1.html')
    return render(request, 'colortest/result.html')