Question

我是Wagtail和Django的新手，我正在尝试构建一个模型，该模型将从REST API中提取数据并将其放入可在模板上迭代的对象中。但是，在尝试迁移时，我收到此错误：

    related = getattr(model, self.relation_name).rel
AttributeError: 'DeferredAttribute' object has no attribute 'rel'

从目前为止我能够收集到的内容，它与description页面模型中的image和OFSLOrgWebPage字段有关。以下是相关模型：

from __future__ import absolute_import, unicode_literals

from django.db import models
from django.shortcuts import render
from django.conf import settings

from wagtail.wagtailcore.models import Page, Orderable
from wagtail.wagtailcore.fields import RichTextField, StreamField
from wagtail.wagtailadmin.edit_handlers import FieldPanel, FieldRowPanel, MultiFieldPanel, \
    InlinePanel, StreamFieldPanel
from wagtail.wagtailimages.edit_handlers import ImageChooserPanel
from wagtail.wagtailsearch import index

from wagtail.wagtailcore.blocks import StructBlock, StreamBlock, CharBlock, RichTextBlock, RawHTMLBlock, BooleanBlock
from wagtail.wagtailimages.blocks import ImageChooserBlock
from wagtail.wagtaildocs.blocks import DocumentChooserBlock

from modelcluster.fields import ParentalKey

import datetime
import json
import requests

class OFSLOrgWebPage(Page):

    description = RichTextField(blank=True)
    image = models.ForeignKey(
        'serenity.Images',
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        related_name='+',
        help_text="Council image that appears at the top of the page. Size: 500px x 400px"
    )

    def get_context(self, request):
        context = super(OFSLOrgWebPage, self).get_context(request)
        context['greek_orgs'] = self.greek_bios.objects.child_of(self).live()
        return context

    search_fields = Page.search_fields + [
        index.SearchField('description'),
        index.SearchField('greek_orgs'),
    ]

    content_panels = Page.content_panels + [
        InlinePanel('description', label='Council Description'),
        InlinePanel('image', label='Council Image'),
        InlinePanel('greek_bios'),
    ]

    template = '../templates/ofsl_site/ofsl_org_web_page.html'

    class Meta:
        verbose_name = "OFSL Greek Org Page"


class OFSLGreekBio(Orderable):
    name = models.CharField(max_length=255, blank=True)
    letters = models.CharField(blank=True, max_length=3)
    group_id = models.CharField(max_length=255, blank=True)
    page = ParentalKey(OFSLOrgWebPage, related_name='greek_bios')

    def get_groups(self):
        response = requests.get(
            ('{}/api/v1/groups-search/?legacy_group_id={}?format=json').format(
                settings['API_BASE_URL'],
                int(self.group_id)))

        if response.status_code != 200:
            return ''

        return response.json()['objects']

    panels = [
        FieldPanel('name'),
        FieldPanel('letters'),
        FieldPanel('group_id'),
    ]

    class Meta:
        verbose_name = "Greek Organization"
        verbose_name_plural = "Greek Organizations"

编辑：我正在运行Django 1.11.4和Wagtail 1.13.1

Answer 1

您的content_panels定义使用了错误的description面板类型，image - InlinePanel仅用于greek_bios之类的子对象关系。你可能想要这个：

content_panels = Page.content_panels + [
    FieldPanel('description'),
    ImageChooserPanel('image'),
    InlinePanel('greek_bios'),
]

Answer 2

你正在使用不支持它的Wangtail版本的Django 2.0 - 支持Django 2.0的Wagtail的第一个版本将是Wagtail 2.0，目前处于测试阶段。

您需要降级到Django 1.11.x或install the Wagtail 2.0 beta release。

AttributeError：'DeferredAttribute'对象没有属性'rel'

2 个答案: