Django 如何使用函数 return 设置基于 class 的视图查询集

Question

我正在尝试使用过滤后的数据进行无休止的分页，并通过 get 请求获取数据。

views.py:

class ProductsView(ListView):
    
    paginate_by = 20
    context_object_name = 'products'
    template_name = "urunler.html"
    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        renkler = Renk.objects.all()
        beden = Varyasyon.objects.all()
        katagori = Grub.objects.all()
        order = self.request.GET.get('order')
        filtered = Stok.objects.all().order_by('-urun_id__kayit_tarihi','foto').distinct('urun_id__kayit_tarihi','foto')
        checked_var = self.request.GET.getlist('varyasyon_id__in')
        checked_renk = self.request.GET.getlist('renk_id__in')
        checked_kat = self.request.GET.getlist('grub_id__in')
        if self.request.GET.getlist("varyasyon_id__in"):
            filtered = filtered.filter(
                Q(varyasyon_id__in = self.request.GET.getlist("varyasyon_id__in"))
            )
        if self.request.GET.getlist("renk_id__in"):
            filtered = filtered.filter(
                Q(renk_id__in = self.request.GET.getlist("renk_id__in"))
            )
        if self.request.GET.getlist("grub_id__in"):
            filtered = filtered.filter(
                Q(grub_id__in = self.request.GET.getlist("grub_id__in"))
            )
        
        if order == "date":
            filters = filtered.filter(
            Q(urun_id__yayin = True) & Q(stok_adet__gt = 0)
        )
        elif order == "sale":
            filters = filtered.filter(
            Q(urun_id__yayin = True) & Q(stok_adet__gt = 0) & Q(indirim = True)
        )
        elif order == "tesettur":
            filters = filtered.filter(
            Q(urun_id__yayin = True) & Q(stok_adet__gt = 0) & Q(urun_id__tesettur = True)
        )
        else:
            filters = filtered.filter(
            Q(urun_id__yayin = True) & Q(stok_adet__gt = 0)
        )
        
        context = {"renkler":renkler,"bedenler":beden,"katagoriler":katagori,'filtered':filters,'checkedvar':checked_var,'checkedrenk':checked_renk,'checkedkat':checked_kat}
        self.queryset = context
        return context
    queryset = get_context_data()

我想从 get_context_data 的 return 设置查询集，但它要求自变量。

错误

TypeError: ProductsView.get_context_data() missing 1 required positional argument: 'self'

当我在顶部定义查询集时，它说 get_context_data 未定义。

Answer 1

也许您应该覆盖 get_queryset 方法。 queryset 不是 context 字典：

class ProductsView(ListView):

    paginate_by = 20
    context_object_name = 'products'
    template_name = "urunler.html"

    def get_queryset(self):
        queryset = super().get_queryset()

        # do stuff here to change queryset dynamically
        ...

        return queryset

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)

        # do stuff here to update your context dict
        ...

        return context

Answer 2

尝试像这样覆盖 get_queryset()，然后使用 get_context_data 覆盖您的上下文，我试过了，它对我有用。

class ProductsView(ListView):
paginate_by = 12
context_object_name = 'filtered'
template_name = 'urunler.html'

def get_queryset(self):
    order = self.request.GET.get('order')
    filtered = Stok.objects.all().order_by('-urun_id__kayit_tarihi','foto').distinct('urun_id__kayit_tarihi','foto')
    checked_var = self.request.GET.getlist('varyasyon_id__in')
    checked_renk = self.request.GET.getlist('renk_id__in')
    checked_kat = self.request.GET.getlist('grub_id__in')
    if self.request.GET.getlist("varyasyon_id__in"):
        filtered = filtered.filter(
            Q(varyasyon_id__in = self.request.GET.getlist("varyasyon_id__in"))
        )
    if self.request.GET.getlist("renk_id__in"):
        filtered = filtered.filter(
            Q(renk_id__in = self.request.GET.getlist("renk_id__in"))
        )
    if self.request.GET.getlist("grub_id__in"):
        filtered = filtered.filter(
            Q(grub_id__in = self.request.GET.getlist("grub_id__in"))
        )
    
    if order == "date":
        filters = filtered.filter(
        Q(urun_id__yayin = True) & Q(stok_adet__gt = 0)
    )
    elif order == "sale":
        filters = filtered.filter(
        Q(urun_id__yayin = True) & Q(stok_adet__gt = 0) & Q(indirim = True)
    )
    elif order == "tesettur":
        filters = filtered.filter(
        Q(urun_id__yayin = True) & Q(stok_adet__gt = 0) & Q(urun_id__tesettur = True)
    )
    else:
        filters = filtered.filter(
        Q(urun_id__yayin = True) & Q(stok_adet__gt = 0)
    )
    return filters

def get_context_data(self, **kwargs):
    context = super().get_context_data(**kwargs)

    renkler = Renk.objects.all()
    beden = Varyasyon.objects.all()
    katagori = Grub.objects.all()
    order = self.request.GET.get('order')
    
    filtered = Stok.objects.all().order_by('-urun_id__kayit_tarihi','foto').distinct('urun_id__kayit_tarihi','foto')
    checked_var = self.request.GET.getlist('varyasyon_id__in')
    checked_renk = self.request.GET.getlist('renk_id__in')
    checked_kat = self.request.GET.getlist('grub_id__in')
    if self.request.GET.getlist("varyasyon_id__in"):
        filtered = filtered.filter(
            Q(varyasyon_id__in = self.request.GET.getlist("varyasyon_id__in"))
        )
    if self.request.GET.getlist("renk_id__in"):
        filtered = filtered.filter(
            Q(renk_id__in = self.request.GET.getlist("renk_id__in"))
        )
    if self.request.GET.getlist("grub_id__in"):
        filtered = filtered.filter(
            Q(grub_id__in = self.request.GET.getlist("grub_id__in"))
        )

    
    if order == "date":
        filters = filtered.filter(
        Q(urun_id__yayin = True) & Q(stok_adet__gt = 0)
    )
    elif order == "sale":
        filters = filtered.filter(
        Q(urun_id__yayin = True) & Q(stok_adet__gt = 0) & Q(indirim = True)
    )
    elif order == "tesettur":
        filters = filtered.filter(
        Q(urun_id__yayin = True) & Q(stok_adet__gt = 0) & Q(urun_id__tesettur = True)
    )
    else:
        filters = filtered.filter(
        Q(urun_id__yayin = True) & Q(stok_adet__gt = 0)
    )
    context.update({"renkler":renkler,"bedenler":beden,"katagoriler":katagori,'checkedvar':checked_var,'checkedrenk':checked_renk,'checkedkat':checked_kat})
    return context

Answer 3

首先 - 为什么您的代码失败。你覆盖 get_context_data，然后对它进行无效调用（你根本没有将 self 传递给它），最后所有这一切都发生在 class 创建期间，而不是实例化，所以 get_context_data 在最后一行调用它时不知道请求。 context_data 和 queryset 不是一回事。您可以执行以下操作来获取 filtered 查询集的分页内容：

class ProductsView(ListView):
    paginate_by = 20
    context_object_name = 'filtered'
    template_name = 'urunler.html'

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context.update({
            'renkler': Renk.objects.all(),
            'bedenler': Varyasyon.objects.all(),
            'katagoriler': Grub.objects.all(),
            'checkedvar':  self.request.GET.getlist('varyasyon_id__in'),
            'checkedrenk': self.request.GET.getlist('renk_id__in'),
            'checkedkat': self.request.GET.getlist('grub_id__in'),
        })
        return context

    def get_queryset(self):
        filtered = Stok.objects.all().order_by('-urun_id__kayit_tarihi','foto').distinct('urun_id__kayit_tarihi','foto')
        
        checked_var = self.request.GET.getlist('varyasyon_id__in')
        checked_renk = self.request.GET.getlist('renk_id__in')
        checked_kat = self.request.GET.getlist('grub_id__in')
        if checked_var:
            filtered = filtered.filter(varyasyon_id__in=checked_var)
        if checked_renk:
            filtered = filtered.filter(renk_id__in=checked_renk)
        if checked_cat:
            filtered = filtered.filter(grub_id__in=checked_cat)
        
        filtered = filtered.filter(urun_id__yayin=True, stok_adet__gt=0)
        order = self.request.GET.get('order')
        if order == "sale":
            filtered = filtered.filter(indirim=True)
        elif order == "tesettur":
            filtered = filtered.filter(urun_id__tesettur=True)
        
        return filtered

Django 如何使用函数 return 设置基于 class 的视图查询集

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