在搭建报名系统时遇到的django报错

今天药忘吃喽~ 2022-05-29 00:15 187阅读 0赞

--------------------

### 报错1： ###

The view sign_up.views.new_user didn't return an HttpResponse object. It returned None instead.

#### views.py代码 ####

def new_user(request):
        if request.method != 'POST':
            form = UserInfoForm()
        else:
            form = UserInfoForm(request.POST)
            if form.is_valid():
                form.save()
                return HttpResponseRedirect(reverse('sign_up:index'))
    
            context = {
       'form':form}
            return render(request,'new_user.html',context)

#### models.py代码 ####

class User_info(models.Model):
        name = models.CharField(max_length=100)
        student_id = models.CharField(max_length=9)
        college = models.CharField(max_length=100)
        date_added = models.DateField(auto_now_add=True)
    
        def __str__(self):
            return self.name

#### new\_user.html代码 ####

{% extends 'sign_up/index.html' %}
    {% block header %}
        <div>请填写信息</div>
    {% endblock %}
    {% block content %}
        <form action="{% url 'sign_up:new_user' %}" method="post">
        {% csrf_token %}
        {% form.as_p %}
        <button type="submit">Add user</button>
        </form>
    {% endblock %}

错误原因：当时报错时查询各种资料以及函数都没有解决。。。最后发现是由于views.py文件中的没有返回值，return错位导致。

正确代码如下：

def new_user(request):
        if request.method != 'POST':
            form = UserInfoForm()
        else:
            form = UserInfoForm(request.POST)
            if form.is_valid():
                form.save()
                return HttpResponseRedirect(reverse('sign_up:index'))
    
        context = {
       'form':form}
        return render(request,'new_user.html',context)

--------------------

### 报错2： ###

![这里写图片描述][Image 1]

Invalid block tag on line 8: 'form.as_p', expected 'endblock'. Did you forget to register or load this tag?

错误原因：前端模版中form.as\_p应该放在\{ \{ \}\}中，而不是\{% %\}中

--------------------

### 报错3： ###

![这里写图片描述][Image 1]

no such table: sign_up_actor_info

错误原因：应当使用`python manage.py makemigrations`以及`` `python manage.py migrate``来迁移数据库以及修改数据库即可

--------------------

### 报错4： ###

Specifying a namespace in include() without providing an app_name

错误原因：python3 Django 环境下，如果你遇到namespace没有注册以及在根目录下urls.py中的include方法的第二个参数namespace添加之后就出错的问题。请在\[app\_name\]目录下的urls.py中的urlpatterns前面加上app\_name=’\[app\_name\]’， \[app\_name\]代表你的应用的名称。

--------------------

### 报错5： ###

![这里写图片描述](//img-blog.csdn.net/20180313203700214?watermark/2/text/Ly9ibG9nLmNzZG4ubmV0L3FxXzM4NTQyMDg1/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70)

错误原因：将根目录下的`url(r'^users/$',include('users.urls',namespace='users')),`中的$删除

--------------------

### 报错6： ###

![这里写图片描述][Image 1]

@login_required
    def new_actor(request):
        if request.method != 'POST':
            form = ActorInfoForm()
        else:
            form = ActorInfoForm(data=request.POST)
            if form.is_valid():
                new_actor = form.save()
                new_actor.owner = request.user
                new_actor.save()
                return HttpResponseRedirect(reverse('sign_up:index'))
    
        context = {
       'form':form}
        return render(request, 'sign_up/new_actor.html', context)

错误原因：在第一次form.save时应该是用参数commit=False，使其不上传到数据库，因为后面还要对其信息进行添加

正确代码如下：

@login_required
    def new_actor(request):
        if request.method != 'POST':
            form = ActorInfoForm()
        else:
            form = ActorInfoForm(data=request.POST)
            if form.is_valid():
                new_actor = form.save(commit=False) #commit=False指不要提交到数据库
                new_actor.owner = request.user
                new_actor.save()
                return HttpResponseRedirect(reverse('sign_up:index'))
    
        context = {
       'form':form}
        return render(request, 'sign_up/new_actor.html', context)

--------------------

### 报错7： ###

'QuerySet' object has no attribute 'owner'

![这里写图片描述][Image 1]

@login_required
    def edit_actor(request,actor_id):
        actor = Actor_info.objects.filter(id=actor_id)
        if actor.owner != request.user:
            raise Http404
        if request.method == 'POST':
            college = request.POST.get('college')
            student_id = request.POST.get('student_id')
            name = request.POST.get('name')
            Actor_info.objects.filter(id=actor_id).update(
                college=college,student_id=student_id,name=name
            )
            return HttpResponseRedirect(reverse('sign_up:actor',args={
       'actor_id':actor_id}))
    
        context = {
       'actor':actor}
        return render(request,'sign_up/edit_actor.html',context=context)

错误原因：应该使用get而不是filter

正确代码如下：

@login_required
    def edit_actor(request,actor_id):
        actor = Actor_info.objects.get(id=actor_id)
        if actor.owner != request.user:
            raise Http404
        if request.method == 'POST':
            college = request.POST.get('college')
            student_id = request.POST.get('student_id')
            name = request.POST.get('name')
            Actor_info.objects.filter(id=actor_id).update(
                college=college,student_id=student_id,name=name
            )
            return HttpResponseRedirect(reverse('sign_up:actor',args=[actor_id]))
    
        context = {
       'actor':actor}
        return render(request,'sign_up/edit_actor.html',context=context)

--------------------

### 报错8： ###

Reverse for 'actor' with no arguments not found. 1 pattern(s) tried: ['actors/(?P<actor_id>\\d+)/$']
    Request Method: POST

![这里写图片描述][Image 1]

@login_required
    def edit_actor(request,actor_id):
        actor = Actor_info.objects.get(id=actor_id)
        if actor.owner != request.user:
            raise Http404
        if request.method == 'POST':
            college = request.POST.get('college')
            student_id = request.POST.get('student_id')
            name = request.POST.get('name')
            Actor_info.objects.filter(id=actor_id).update(
                college=college,student_id=student_id,name=name
            )
            return HttpResponseRedirect(reverse('sign_up:actor'),args=[actor_id])
    
        context = {
       'actor':actor}
        return render(request,'sign_up/edit_actor.html',context=context)

错误原因：args为reverse函数的参数，而不是HttpResponseRedirect的参数

正确代码如下：

[Image 1]: