用于自引用多对多关系的 Wagtail 面板

Question

我正忙着用 wagtail 制作知识图谱之类的东西。

CurriculumContentItem 是该图上的一个节点。和自己是多对多的关系，through模型有重要的字段。

我正在努力让它在管理页面中可用。请参阅内联评论：

class ContentItemOrder(models.Model):
    post = models.ForeignKey(
        "CurriculumContentItem", on_delete=models.PROTECT, related_name="pre_ordered_content"
    )
    pre = models.ForeignKey(
        "CurriculumContentItem", on_delete=models.PROTECT, related_name="post_ordered_content"
    )
    hard_requirement = models.BooleanField(default=True)

class CurriculumContentItem(Page):
    body = RichTextField(blank=True)

    prerequisites = models.ManyToManyField(
        "CurriculumContentItem",
        related_name="unlocks",
        through="ContentItemOrder",
        symmetrical=False,
    )

    content_panels = Page.content_panels + [
        # FieldPanel("prerequisites") 
        # FieldPanel just lets me select CurriculumContentItems, but I need to access fields in the through model

        # InlinePanel("prerequisites"), 
        # This causes a recursion error

        FieldPanel('body', classname="full collapsible"),
    ]

如果我想在普通的 Django 管理中执行此操作，我会使用内联来指定先决条件。类似于：

class ContentItemOrderPostAdmin(admin.TabularInline):
    model = models.ContentItem.prerequisites.through
    fk_name = "post"

class ContentItemOrderPreAdmin(admin.TabularInline):
    model = models.ContentItem.unlocks.through
    fk_name = "pre"

Wagtail中有没有类似的机制？

看来我需要为此创建一个自定义面板。

Answer 1

我建议构建一个指向您的 'through' 模型的 InlinePanel，这意味着您正在使用 one-to-many 关系而不是 many-to-many:

class ContentItemOrder(models.Model):
    post = ParentalKey(
        "CurriculumContentItem", related_name="pre_ordered_content"
    )
    pre = models.ForeignKey(
        "CurriculumContentItem", on_delete=models.PROTECT, related_name="post_ordered_content"
    )
    hard_requirement = models.BooleanField(default=True)

    panels = [
        PageChooserPanel('pre'),
        FieldPanel('hard_requirement')
    ]


class CurriculumContentItem(Page):
    body = RichTextField(blank=True)

    content_panels = Page.content_panels + [
        InlinePanel("pre_ordered_content"), 

        FieldPanel('body', classname="full collapsible"),
    ]

Answer 2

这个有效：

使直通模型继承自Orderable
使用 ParentalKey 而不是 ForeignKey
使用InlinePanel引用直通模型中字段的相关名称

from modelcluster.fields import ParentalKey
from wagtail.core.models import Page, Orderable


class ContentItemOrder(Orderable):   ### 1
    post = ParentalKey(   ### 2
        "CurriculumContentItem", on_delete=models.PROTECT, related_name="pre_ordered_content"
    )
    pre = ParentalKey(   ### 2
        "CurriculumContentItem", on_delete=models.PROTECT, related_name="post_ordered_content"
    )
    hard_requirement = models.BooleanField(default=True)

    panels = [
        PageChooserPanel('pre'),
        PageChooserPanel('post'),
        FieldPanel('hard_requirement'),
    ]


class CurriculumContentItem(Page):
    body = RichTextField(blank=True)

    prerequisites = models.ManyToManyField(
        "CurriculumContentItem",
        related_name="unlocks",
        through="ContentItemOrder",
        symmetrical=False,
    )

    content_panels = Page.content_panels + [
        InlinePanel('pre_ordered_content', label="prerequisites"),  ### 3
        InlinePanel('post_ordered_content', label="unlocks"),       ### 3

        FieldPanel('body', classname="full collapsible"),
    ]

我担心每个内联会有 2 个可用的 PageChooser 字段，但 wagtail 非常聪明（而且神奇），它只绘制我们需要的那个

用于自引用多对多关系的 Wagtail 面板

Wagtail panel for self-referential many to many relationships with a through model

django

wagtail

wagtail-admin