Question

我正在建立一个django应用程序，其中当我从后端添加学生详细信息时使用一对一的字段，效果很好，但形成了前端形式，它给出以下错误“ / prog中的IntegrityError 唯一约束失败：grading_program_of_study.student_id “

//////////////my view code////////////////

def prog(request):
    if request.method == 'POST':
        if request.POST['program_name'] and request.POST['date_of_entry'] and request.POST['faculty']and request.POST['department'] and request.POST['program_type'] and request.POST['date_of_complition']:
            Program_of_study = program_of_study()
            Program_of_study.program_name = request.POST['program_name']
            Program_of_study.date_of_entry = request.POST['date_of_entry']
            Program_of_study.faculty = request.POST['faculty']
            Program_of_study.department = request.POST['department']
            Program_of_study.department = request.POST['program_type']
            Program_of_study.date_of_complition = request.POST['date_of_complition']

            Program_of_study.save()


            return redirect('home',{'sucess':'Program added sucessfully'})

        else:
            return render(request,'grading/home.html')
    else:
        return render(request,'grading/home.html')



########### my model code################################

class program_of_study(models.Model):
    student = models.OneToOneField(student_details, on_delete=models.CASCADE,default = 1)
    program_name = models.CharField(max_length=50)
    date_of_entry = models.DateField()
    faculty = models.CharField(max_length=50)
    department = models.CharField(max_length=50)
    program_type = models.CharField(max_length=50)
    date_of_complition = models.DateField()


    def __str__(self):
        return self.program_name

Answer 1

您的问题是学生字段中的默认值。由于您具有OneToOne关系，因此您无法重复值，因此就无法使用默认值。

student = models.OneToOneField(student_details, on_delete=models.CASCADE, default = 1)

您可以解决的问题是将字段类型更改为ForeignKey或删除默认值。

Answer 2

感谢上帝，我仅用一行代码就解决了这个问题，错误是我试图将数据保存为字符串而不是整数

###############问题的解决方案

Program_of_study.student = student_details.object.latest（id）

如何在Django中修复“ / prog UNIQUE约束处的IntegrityError失败：grading_program_of_study.student_id”

2 个答案: