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python - 按日期订购帖子

问题描述

我已经创建了一个帖子列表，现在我想按发布日期排序这个列表。如果我在视图中使用order_by(-post_publishing_date)，shell 会显示此错误：

NameError：未定义名称“post_publishing_date”

模型.py

class PostModel(models.Model):
    post_title = models.CharField(max_length=70)
    post_short_description = models.TextField(max_length=200)
    post_contents = models.TextField()
    post_publishing_date = models.DateTimeField(auto_now=False, auto_now_add=True)
    post_author = models.ForeignKey(AuthorModel, on_delete=models.CASCADE, related_name="connected_author")
    post_keyconcept = models.ManyToManyField(KeyConceptModel, related_name="connected_keyconcept")
    slug = models.SlugField(verbose_name="Slug", unique="True")
    post_highlighted = models.BooleanField(default=False)

    def __str__(self):
        return self.post_title

    def get_absolute_url(self): 
        return reverse("singlepostManuscriptusView", kwargs={"slug": self.slug})

    class Meta:
        verbose_name = "Articolo"
        verbose_name_plural = "Articoli"

视图.py

class SinglePostGDV(DetailView):
    model = PostModel
    template_name = "manuscriptus_post_detail.html"


class ListPostGDV(ListView):
    model = PostModel
    template_name = "manuscriptus_home.html"
    queryset = PostModel.objects.filter().order_by(-post_publishing_date)

网址.py

urlpatterns = [
    path("it/blog/", ListPostGDV.as_view(), name="homeManuscriptusView"),
    path("it/blog/<slug:slug>/", SinglePostGDV.as_view(), name="singlepostManuscriptusView"), 
]

我做错了什么？

标签： pythondjangopython-3.xdjango-2.1

解决方案

临时订购

好吧，Python 是正确的。没有identifier post_publishing_date，您通过string传递列的名称，因此：

class ListPostGDV(ListView):
    model = PostModel
    template_name = "manuscriptus_home.html"
    queryset = PostModel.objects.filter().order_by('-post_publishing_date')

定义模型的固有顺序

请注意，您还可以在Meta类中为模型提供“固有”排序：

class PostModel(models.Model):
    post_title = models.CharField(max_length=70)
    post_short_description = models.TextField(max_length=200)
    post_contents = models.TextField()
    post_publishing_date = models.DateTimeField(auto_now=False, auto_now_add=True)
    post_author = models.ForeignKey(AuthorModel, on_delete=models.CASCADE, related_name="connected_author")
    post_keyconcept = models.ManyToManyField(KeyConceptModel, related_name="connected_keyconcept")
    slug = models.SlugField(verbose_name="Slug", unique="True")
    post_highlighted = models.BooleanField(default=False)

    def __str__(self):
        return self.post_title

    def get_absolute_url(self): 
        return reverse("singlepostManuscriptusView", kwargs={"slug": self.slug})

    class Meta:
        ordering = ['-post_publishing_date']
        verbose_name = "Articolo"
        verbose_name_plural = "Articoli"

如果您这样做，则对该模型的所有查询都将隐式按-post_publishing_date. 因此，这意味着您不能“忘记”正确排序对象。

因此，您不必在视图中订购它。当然，您只能定义一种这样的“固有”顺序，并且不清楚您是否要在此处使用一种。

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