Question

预期的行为：

我有一个django应用程序，用户可以在其中上传“ beats”（mp3文件），我最终希望拥有免费层和付费层。免费套餐将受到他们能够上传的“拍子”数量的限制。为免费用户说最多3个节拍。

我正在尝试在视图中运行查询，该查询会将用户发送到模板页面，如果用户超出允许上传的节拍数量，则要求他们成为高级会员。它应该检查谁是登录用户，获取该用户上传的节拍计数，如果小于允许的数量，则显示上传模板，否则显示注册模板。

当前行为：

使用self.request.user给出我的NameError自我未定义。将用户ID硬编码到查询中时，我能够使代码工作。这是我当前的代码。

#beatupload/views.py

class UploadView(ListView):
    model = beat
    template_name = 'uploads.html'
    def get_queryset(self):
        return beat.objects.filter(producer=self.request.user)

class uploadNew(CreateView): # new
    model = beat
    fields = ['title', 'beat']

    success_url = reverse_lazy('uploads')
    #Check number of beats uploaded by user and if exceeds amount require signup
    #To render sign up template if true and proceed to upload if false
    def get_queryset():
        return beat.objects.filter(producer_id="3")   

    if get_queryset().count() <= 2:
        template_name = 'uploadNew.html'
    else:
        template_name = 'becomeMember.html'
    #END CHECK

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

# beatupload/models.py
from django.conf import settings
from django.db import models


class beat(models.Model):
    title = models.CharField(max_length=50)
    beat = models.FileField(upload_to='beats/')
    producer = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)

    def __str__(self):
        return self.title

如果您在上述类中看到了ListView，则表示已成功列出仅由登录用户上传的节拍。尝试修改该代码并获得计数是行不通的，因为我得到的“自我”未定义错误。例如：

class uploadNew(CreateView): # new
    model = beat
    fields = ['title', 'beat']

    success_url = reverse_lazy('uploads')
    #Check number of beats uploaded by user and if exceeds amount require signup
    #To render sign up template if true and proceed to upload if false
    def get_queryset(self):
        return beat.objects.filter(producer=self.request.user)   

    if get_queryset(self).count() <= 2: ###ERROR COMES FROM HERE###
        template_name = 'uploadNew.html'
    else:
        template_name = 'becomeMember.html'
    #END CHECK

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

如上所述，我在代码的if语句部分收到名称错误。

如果我将if语句缩进到这样的函数中：

class uploadNew(CreateView): # new
    model = beat
    fields = ['title', 'beat']

    success_url = reverse_lazy('uploads')
    #Check number of beats uploaded by user and if exceeds amount require signup
    #To render sign up template if true and proceed to upload if false
    def get_queryset(self):
        return beat.objects.filter(producer=self.request.user)   

        if get_queryset(self).count() <= 2:
            template_name = 'uploadNew.html'
        else:
            template_name = 'becomeMember.html'
        #END CHECK

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

我没有收到错误，但是django无法找到模板。

另外，如果我重新启动开发服务器，它似乎只能工作（当用硬编码生产者的ID编码时）。因此，如果限制设置为<= 2（我希望允许3次上传），则只要开发服务器正在运行，我就可以继续上传节奏。如果我停止服务器并再次启动它，则将我重定向到模板变得成为Member.html。

\views.py", line 27, in uploadNew
    if get_queryset(self).count() <= 2:
NameError: name 'self' is not defined

这是名称错误。

这是模板错误：

Django tried loading these templates, in this order:

Using engine django:

    django.template.loaders.filesystem.Loader: C:\Users\Alex.INACOM-SBY\Documents\code\theBeatStore\agBeatStoreRoot\templates\beatupload\beat_form.html (Source does not exist)

    django.template.loaders.app_directories.Loader: C:\Users\Alex.INACOM-SBY\Documents\code\env\lib\site-packages\django\contrib\admin\templates\beatupload\beat_form.html (Source does not exist)

    django.template.loaders.app_directories.Loader: C:\Users\Alex.INACOM-SBY\Documents\code\env\lib\site-packages\django\contrib\auth\templates\beatupload\beat_form.html (Source does not exist)

Answer 1

您应该重写get_template_names方法，如下所示：

def get_template_names(self):
    if beat.objects.filter(producer=self.request.user).count() <= 2:
        return ['uploadNew.html',]
    else:
        return ['becomeMember.html',]

根据登录用户

1 个答案: