Wagtail 如何获取可排序项的值

Question

我刚开始学习使用Wagtail编程。我的尝试是做一个级联应用，也就是说标题是根据底层元素的关系来形成的。这个级联的结构应该是这样的：专业 --> 系列 --> 级别 --> 容器。

这是我的models.py文件。

class NoTitleForm(WagtailAdminPageForm):
    title = forms.CharField(required=False, disabled=True, help_text=('Title is autogenerated'))
    slug = forms.CharField(required=False, disabled=True, help_text=('Slug is autogenerated'))

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        if not self.initial['title']:
            self.initial['title'] = _('auto-generated-title')
        if not self.initial['slug']:
            self.initial['slug'] = _('auto-generated-slug')


class ReihePage(Page):
    base_form_class = NoTitleForm

    content_panels = [
        MultiFieldPanel(
            [
                InlinePanel("Fach", label="Fach", min_num=0, max_num=10),
            ]
                      ),

        FieldPanel('title'),
        FieldPanel('slug'),
        ]

    def clean(self):
        super().clean()
        new_title = "anzahl from Fach" + "title from Fach" <--** How to get the values from the InlinePanel**
        
        self.title = new_title
        self.slug = slugify(new_title) 

class ReihePageOrderable(Orderable):
    page = ParentalKey(ReihePage, related_name="Fach", null=True)
    fach = models.ForeignKey("Fachpage", on_delete=models.SET_NULL, null=True)
    anzahl = models.IntegerField(default=1)
    
    
class FachPage(Page):
    laenge = models.IntegerField(null=True, blank=True, verbose_name='Länge in mm')
    breite = models.IntegerField(null=True, blank=True, verbose_name='Breite in mm')

    content_panels = [
        # FieldPanel('bezeichnung'),
        FieldPanel('laenge'),
        FieldPanel('breite'),
        FieldPanel('title'),
        FieldPanel('slug'),
        ]

    parent_page_types = ['FachIndexPage']

    class Meta:
        unique_together = ('laenge', 'breite')

    def clean(self):
        """Override the values of title and slug before saving."""
        super().clean()
        a = str(self.laenge)
        b = str(self.breite)
        new_title = "Fach" + " " + a + "x" + b + " mm"
        self.title = new_title
        self.slug = slugify(new_title)
    base_form_class = NoTitleForm

我看了Wagtail网站上的文档，尝试使用get_context函数，还有很多其他的尝试。

Answer 1

你想要建立一个Wagtail的设置，让每个页面的标题根据它相关的元素来决定。如果我没理解错的话，你的ReihePage应该有一个标题，这个标题是由它包含的FachPage实例的数量和这些实例的标题组成，对吧？为了做到这一点，你需要从你的ReihePage中获取相关的FachPage实例。你可以通过在ReihePage模型中查询这些相关的FachPage实例来实现。

class ReihePage(Page):
    base_form_class = NoTitleForm

    content_panels = [
        MultiFieldPanel([
            InlinePanel("fach_relation", label="Fach", min_num=0, max_num=10),
        ]),
        FieldPanel('title'),
        FieldPanel('slug'),
    ]

    def clean(self):
        super().clean()
        fach_instances = self.fach_relation.all()
        fach_count = len(fach_instances)
        fach_titles = [fach_instance.title for fach_instance in fach_instances]
        new_title = f"Count from Fach: {fach_count}, Titles: {', '.join(fach_titles)}"
        self.title = new_title
        self.slug = slugify(new_title)


class ReihePageOrderable(Orderable):
    page = ParentalKey(ReihePage, related_name="fach_relation")
    fach = models.ForeignKey("FachPage", on_delete=models.SET_NULL, null=True)
    anzahl = models.IntegerField(default=1)