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Wagtail面板,用于通过模型的自引用多对多关系

wagtail-admin wagtail django

0

Sheena · 技术社区 · 4 年前

我正忙着在wagtail中制作一些类似知识图的东西。

CurriculumContentItem 是该图上的一个节点。它与自身有着多对多的关系,贯穿模型具有重要的领域。

我正在努力让它在管理页面中可用。请查看内联评论:

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管理中这样做,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有类似的机制吗?

看起来我需要为此创建一个自定义面板。

0 回复 | 直到 4 年前

1

0

gasman 4 年前

我建议构建一个指向“直通”模型的InlinePanel,这意味着你使用的是一对多关系,而不是多对多关系:

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"),
    ]

2

0

Sheena 4 年前

这样可以:

使直通模型从Orderable继承
利用 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PageChooser字段可用,但wagtail足够聪明(神奇),它只画出了我们需要的一个