Django 通过表单OnetoOneField更新-重复键值违反唯一约束

我正在创建一个应用程序，用户可以在其中创建一个

项目

，每个项目都有一个

问题集

（即一个表单-我称之为Firstquestions）

我希望用户能够通过表单编辑/更新这组问题。 但是，我得到了一个错误：

重复键值违反唯一约束

我正在使用PostgreSQL

项目/模型.py

class Project(models.Model):
    title = models.CharField(max_length=255)
    content = models.TextField()
    developer = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)

urlpatterns = [
    #Regarding the projects
    path('allprojects', views.allprojects, name='allprojects'),
    path('createproject', views.createproject, name='createproject'),
    path('<int:project_id>', views.projectdetail, name='projectdetail'),
    path('<int:project_id>/editproject', views.editproject, name='editproject'),
    path('<int:project_id>/deleteproject', views.deleteproject, name='deleteproject'),
    #Regarding the set of questions
    path('<int:project_id>/', include('firstquestions.urls')),

]

class Firstquestion(models.Model):
    first_one = models.TextField()
    first_two = models.TextField()
    first_three = models.TextField()
    first_four = models.TextField()
    first_five = models.TextField()
    first_six = models.TextField()
    first_seven = models.TextField()
    developer = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
    project = models.OneToOneField(Project, on_delete=models.CASCADE)

urlpatterns = [
    path('questionstoanswer', views.questionstoanswer, name='questionstoanswer'),
    path('firstquestionsdetail', views.firstquestionsdetail, name='firstquestionsdetail'),
    path('firstquestionsedit', views.firstquestionsedit, name='firstquestionsedit'),

]

@login_required
def firstquestionsedit(request, project_id):
  project = get_object_or_404(Project, pk=project_id)
  if request.method == 'POST':
    if request.POST['first_one'] and request.POST['first_two'] and request.POST['first_three'] and request.POST['first_four'] and request.POST['first_five'] and request.POST['first_seven']:
      question = Firstquestion()
      question.first_one = request.POST['first_one']
      question.first_two = request.POST['first_two']
      question.first_three = request.POST['first_three']
      question.first_four = request.POST['first_four']
      question.first_five = request.POST['first_five']
      # question.first_six = request.POST['first_six']
      question.first_seven = request.POST['first_seven']
      question.developer = request.user
      question.project = project
      question.save()
      messages.success(request, 'Answers for User Centered Design questions have been edited')
      return redirect('/projects/allprojects')
    else:
      return render(request, 'firstquestions/firstquestionsedit.html', {'error':'All fields are required.'})
  return render(request, 'firstquestions/firstquestionsedit.html', {'project':project})

projects/url.py

class Project(models.Model):
    title = models.CharField(max_length=255)
    content = models.TextField()
    developer = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)

urlpatterns = [
    #Regarding the projects
    path('allprojects', views.allprojects, name='allprojects'),
    path('createproject', views.createproject, name='createproject'),
    path('<int:project_id>', views.projectdetail, name='projectdetail'),
    path('<int:project_id>/editproject', views.editproject, name='editproject'),
    path('<int:project_id>/deleteproject', views.deleteproject, name='deleteproject'),
    #Regarding the set of questions
    path('<int:project_id>/', include('firstquestions.urls')),

]

class Firstquestion(models.Model):
    first_one = models.TextField()
    first_two = models.TextField()
    first_three = models.TextField()
    first_four = models.TextField()
    first_five = models.TextField()
    first_six = models.TextField()
    first_seven = models.TextField()
    developer = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
    project = models.OneToOneField(Project, on_delete=models.CASCADE)

urlpatterns = [
    path('questionstoanswer', views.questionstoanswer, name='questionstoanswer'),
    path('firstquestionsdetail', views.firstquestionsdetail, name='firstquestionsdetail'),
    path('firstquestionsedit', views.firstquestionsedit, name='firstquestionsedit'),

]

@login_required
def firstquestionsedit(request, project_id):
  project = get_object_or_404(Project, pk=project_id)
  if request.method == 'POST':
    if request.POST['first_one'] and request.POST['first_two'] and request.POST['first_three'] and request.POST['first_four'] and request.POST['first_five'] and request.POST['first_seven']:
      question = Firstquestion()
      question.first_one = request.POST['first_one']
      question.first_two = request.POST['first_two']
      question.first_three = request.POST['first_three']
      question.first_four = request.POST['first_four']
      question.first_five = request.POST['first_five']
      # question.first_six = request.POST['first_six']
      question.first_seven = request.POST['first_seven']
      question.developer = request.user
      question.project = project
      question.save()
      messages.success(request, 'Answers for User Centered Design questions have been edited')
      return redirect('/projects/allprojects')
    else:
      return render(request, 'firstquestions/firstquestionsedit.html', {'error':'All fields are required.'})
  return render(request, 'firstquestions/firstquestionsedit.html', {'project':project})

firstquestions/url.py

class Project(models.Model):
    title = models.CharField(max_length=255)
    content = models.TextField()
    developer = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)

urlpatterns = [
    #Regarding the projects
    path('allprojects', views.allprojects, name='allprojects'),
    path('createproject', views.createproject, name='createproject'),
    path('<int:project_id>', views.projectdetail, name='projectdetail'),
    path('<int:project_id>/editproject', views.editproject, name='editproject'),
    path('<int:project_id>/deleteproject', views.deleteproject, name='deleteproject'),
    #Regarding the set of questions
    path('<int:project_id>/', include('firstquestions.urls')),

]

class Firstquestion(models.Model):
    first_one = models.TextField()
    first_two = models.TextField()
    first_three = models.TextField()
    first_four = models.TextField()
    first_five = models.TextField()
    first_six = models.TextField()
    first_seven = models.TextField()
    developer = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
    project = models.OneToOneField(Project, on_delete=models.CASCADE)

urlpatterns = [
    path('questionstoanswer', views.questionstoanswer, name='questionstoanswer'),
    path('firstquestionsdetail', views.firstquestionsdetail, name='firstquestionsdetail'),
    path('firstquestionsedit', views.firstquestionsedit, name='firstquestionsedit'),

]

@login_required
def firstquestionsedit(request, project_id):
  project = get_object_or_404(Project, pk=project_id)
  if request.method == 'POST':
    if request.POST['first_one'] and request.POST['first_two'] and request.POST['first_three'] and request.POST['first_four'] and request.POST['first_five'] and request.POST['first_seven']:
      question = Firstquestion()
      question.first_one = request.POST['first_one']
      question.first_two = request.POST['first_two']
      question.first_three = request.POST['first_three']
      question.first_four = request.POST['first_four']
      question.first_five = request.POST['first_five']
      # question.first_six = request.POST['first_six']
      question.first_seven = request.POST['first_seven']
      question.developer = request.user
      question.project = project
      question.save()
      messages.success(request, 'Answers for User Centered Design questions have been edited')
      return redirect('/projects/allprojects')
    else:
      return render(request, 'firstquestions/firstquestionsedit.html', {'error':'All fields are required.'})
  return render(request, 'firstquestions/firstquestionsedit.html', {'project':project})

我的编辑功能

firstquestions/views.py

class Project(models.Model):
    title = models.CharField(max_length=255)
    content = models.TextField()
    developer = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)

urlpatterns = [
    #Regarding the projects
    path('allprojects', views.allprojects, name='allprojects'),
    path('createproject', views.createproject, name='createproject'),
    path('<int:project_id>', views.projectdetail, name='projectdetail'),
    path('<int:project_id>/editproject', views.editproject, name='editproject'),
    path('<int:project_id>/deleteproject', views.deleteproject, name='deleteproject'),
    #Regarding the set of questions
    path('<int:project_id>/', include('firstquestions.urls')),

]

class Firstquestion(models.Model):
    first_one = models.TextField()
    first_two = models.TextField()
    first_three = models.TextField()
    first_four = models.TextField()
    first_five = models.TextField()
    first_six = models.TextField()
    first_seven = models.TextField()
    developer = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
    project = models.OneToOneField(Project, on_delete=models.CASCADE)

urlpatterns = [
    path('questionstoanswer', views.questionstoanswer, name='questionstoanswer'),
    path('firstquestionsdetail', views.firstquestionsdetail, name='firstquestionsdetail'),
    path('firstquestionsedit', views.firstquestionsedit, name='firstquestionsedit'),

]

@login_required
def firstquestionsedit(request, project_id):
  project = get_object_or_404(Project, pk=project_id)
  if request.method == 'POST':
    if request.POST['first_one'] and request.POST['first_two'] and request.POST['first_three'] and request.POST['first_four'] and request.POST['first_five'] and request.POST['first_seven']:
      question = Firstquestion()
      question.first_one = request.POST['first_one']
      question.first_two = request.POST['first_two']
      question.first_three = request.POST['first_three']
      question.first_four = request.POST['first_four']
      question.first_five = request.POST['first_five']
      # question.first_six = request.POST['first_six']
      question.first_seven = request.POST['first_seven']
      question.developer = request.user
      question.project = project
      question.save()
      messages.success(request, 'Answers for User Centered Design questions have been edited')
      return redirect('/projects/allprojects')
    else:
      return render(request, 'firstquestions/firstquestionsedit.html', {'error':'All fields are required.'})
  return render(request, 'firstquestions/firstquestionsedit.html', {'project':project})

请试试这个

 @login_required
    def firstquestionsedit(request, project_id):
      project = get_object_or_404(Project, pk=project_id)
      if request.method == 'POST':
        if request.POST['first_one'] and request.POST['first_two'] and request.POST['first_three'] and request.POST['first_four'] and request.POST['first_five'] and request.POST['first_seven']:
          question = Firstquestion.objects.filter(project=project).first()
          question.first_one = request.POST['first_one']
          question.first_two = request.POST['first_two']
          question.first_three = request.POST['first_three']
          question.first_four = request.POST['first_four']
          question.first_five = request.POST['first_five']
          # question.first_six = request.POST['first_six']
          question.first_seven = request.POST['first_seven']
          question.save()
          messages.success(request, 'Answers for User Centered Design questions have been edited')
          return redirect('/projects/allprojects')
        else:
          return render(request, 'firstquestions/firstquestionsedit.html', {'error':'All fields are required.'})
      return render(request, 'firstquestions/firstquestionsedit.html', {'project':project})

---

首先，您应该使用Django表单。模型表单将为您完成大部分工作，包括验证和保存。非常感谢，您能更准确地说“模型表单”吗？我是Django的新手，谢谢！现在唯一的问题是，当我更新

first_-six

时，我在/projects/5/firstquestionsedit处得到了错误

multivaluedictkeyrorm

我想你没有通过post请求传递“first_-six”键。谢谢，它是在html中。我忘了传递

name=“first\u six”