在我的博客文章模型中,我试图将RichTextField迁移到StreamField。我关注了Wagtail文档“将RichTextFields迁移到StreamField”,包括有关迁移具有修订版本的博客文章的部分。他们没有效果。如何将RichTextField转换为StreamField?
这是针对使用Django 1.11.13,Wagtail 2.1和PostgreSQL的博客的。我有200多个博客文章,其中许多具有“实时+草案”状态,这意味着它们尚未发布。我检查了数据库中的博客文章,看起来它们的正文字段存储为HTML。
我复制了文档中的代码,并更改了所有引用以与自己的项目相关。运行迁移后,我得到了AttributeError,找不到“ raw_text”。所以我创建了一个异常来传递它。我应用了迁移,一切顺利。
然后在models.py中,将类的body属性从RichTextField更改为带有RichFieldBlock的StreamField。我还将其内容面板从FieldPanel更改为StreamFieldPanel。我应用了此迁移,并以OK结束。
当我在Wagtail admin中查看一些帖子时,所有具有Live + Draft状态的帖子都转换为StreamFields内的RichTextBlocks,但是它们的内容被包装在名为{'rich_text':''}的JSON对象中。 JSON对象的样式与编辑器中其余文本的样式不同。当我实时查看这些帖子时,没有显示任何数据,我认为是因为模板无法读取JSON。所有具有“实时”状态的博客帖子也都将RichTextField转换为StreamField,但是其内容为空。他们的数据已从编辑器中删除。当我查看他们的直播时,他们一片空白。但是,当我在数据库中检查它们时,它们的主体字段仍然包含我看到的以前的HTML。
这是管理员中的实时+草稿帖子:
这是管理员的实时帖子:
在运行两次迁移并看到奇数数据之后,我尝试安装数据库的新副本,但这并不能改善问题。
template.html:
<section>
{{ page.body }}
</section>
在运行转换迁移之前,models.py:
class BlogPost(Page):
body = RichTextField(blank=True)
content_panels = Page.content_panels + [
FieldPanel('body'),
]
migration.py,我在page_to_streamfield()
函数中添加了AttributeError异常,因为未找到raw_text:
# -*- coding: utf-8 -*-
# Generated by Django 1.11.13 on 2019-05-01 13:46
from __future__ import unicode_literals
import json
from django.core.serializers.json import DjangoJSONEncoder
from django.db import migrations, models
from wagtail.core.rich_text import RichText
def page_to_streamfield(page):
changed = False
try:
if page.body.raw_text and not page.body:
page.body = [('rich_text', {'rich_text': RichText(page.body.raw_text)})]
changed = True
except AttributeError:
pass
return page, changed
def pagerevision_to_streamfield(revision_data):
changed = False
body = revision_data.get('body')
if body:
try:
json.loads(body)
except ValueError:
revision_data['body'] = json.dumps(
[{
"value": {"rich_text": body},
"type": "rich_text"
}],
cls=DjangoJSONEncoder)
changed = True
else:
# It's already valid JSON. Leave it.
pass
return revision_data, changed
def page_to_richtext(page):
changed = False
if page.body.raw_text is None:
raw_text = ''.join([
child.value['rich_text'].source for child in page.body
if child.block_type == 'rich_text'
])
page.body = raw_text
changed = True
return page, changed
def pagerevision_to_richtext(revision_data):
changed = False
body = revision_data.get('body', 'definitely non-JSON string')
if body:
try:
body_data = json.loads(body)
except ValueError:
# It's not apparently a StreamField. Leave it.
pass
else:
raw_text = ''.join([
child['value']['rich_text'] for child in body_data
if child['type'] == 'rich_text'
])
revision_data['body'] = raw_text
changed = True
return revision_data, changed
def convert(apps, schema_editor, page_converter, pagerevision_converter):
BlogPage = apps.get_model("blog", "BlogPost")
for page in BlogPage.objects.all():
page, changed = page_converter(page)
if changed:
page.save()
for revision in page.revisions.all():
revision_data = json.loads(revision.content_json)
revision_data, changed = pagerevision_converter(revision_data)
if changed:
revision.content_json = json.dumps(revision_data, cls=DjangoJSONEncoder)
revision.save()
def convert_to_streamfield(apps, schema_editor):
return convert(apps, schema_editor, page_to_streamfield, pagerevision_to_streamfield)
def convert_to_richtext(apps, schema_editor):
return convert(apps, schema_editor, page_to_richtext, pagerevision_to_richtext)
class Migration(migrations.Migration):
dependencies = [
# leave the dependency line from the generated migration intact!
('blog', 'previous_migration'),
]
operations = [
migrations.RunPython(
convert_to_streamfield,
convert_to_richtext,
),
]
models.py运行上一次迁移后,我手动将其更改为StreamField并针对此更改运行了第二次迁移:
class BlogPost(Page):
body = StreamField([
('rich_text', blocks.RichTextBlock())
], blank=True)
content_panels = Page.content_panels + [
StreamFieldPanel('body'),
]
我希望在Wagtail管理员的StreamField内看到博客文章的数据,但是它是空白的或包装在JSON对象中。
答案 0 :(得分:1)
使用此脚本,我能够使用RichTextBlock将RichTextField迁移到StreamField(假定架构类似于Wagtail入门教程的前三章)。我发现通过将其分为不同的步骤可以更轻松地考虑此过程:从备份/进行备份,模式迁移,数据迁移以及管理/模板更改中获得新的数据库。我发现我需要遍历每个BlogPost及其所有关联的PageRevision。编辑实时发布的数据非常简单,但是草稿以序列化JSON的形式存储在两个级别的深度,这很难弄清楚如何进行交互。希望该脚本可以帮助其他人。注意:此脚本不会反向迁移。
0004_convert_data.py
import json
from django.db import migrations
import wagtail.core.fields
from wagtail.core.rich_text import RichText
def convert_data(apps, schema_editor):
blog_page = apps.get_model('blog', 'BlogPage')
for post in blog_page.objects.all():
print('\n', post.title)
# edit the live post
if post.body.raw_text and not post.body:
post.body = [('paragraph', RichText(post.body.raw_text))]
print('Updated ' + post.title)
post.save()
# edit drafts associated with post
if post.has_unpublished_changes:
print(post.title + ' has drafts...')
for rev in post.revisions.all():
data = json.loads(rev.content_json)
body = data['body']
print(body)
print('This is current JSON:', data, '\n')
data['body'] = json.dumps([{
"type": "paragraph",
"value": body
}])
rev.content_json = json.dumps(data)
print('This is updated JSON:', rev.content_json, '\n')
rev.save()
print('Completed ' + post.title + '.' + '\n')
class Migration(migrations.Migration):
dependencies = [
('blog', '0003_blogpage_stream'),
]
operations = [
migrations.AlterField(
model_name='blogpage',
name='body',
field=wagtail.core.fields.StreamField([('paragraph', wagtail.core.blocks.RichTextBlock())], blank=True),
),
migrations.RunPython(convert_data),
]
models.py
from django.db import models
from wagtail.core.models import Page
from wagtail.core import blocks
from wagtail.core.fields import RichTextField, StreamField
from wagtail.admin.edit_handlers import FieldPanel, StreamFieldPanel
from wagtail.images.blocks import ImageChooserBlock
from wagtail.search import index
class BlogIndexPage(Page):
intro = RichTextField(blank=True)
content_panels = Page.content_panels + [
FieldPanel('intro', classname="full")
]
class BlogPage(Page):
date = models.DateField("Post date")
intro = models.CharField(max_length=250)
# body = RichTextField(blank=True)
body = StreamField([
('paragraph', blocks.RichTextBlock()),
], blank=True)
stream = StreamField([
('heading', blocks.CharBlock(classname="full title")),
('paragraph', blocks.RichTextBlock()),
('image', ImageChooserBlock()),
], blank=True)
search_fields = Page.search_fields + [
index.SearchField('intro'),
index.SearchField('body'),
]
content_panels = Page.content_panels + [
FieldPanel('date'),
FieldPanel('intro'),
StreamFieldPanel('body'),
StreamFieldPanel('stream'),
]
templates / blog / blog_page.html
{% extends "base.html" %}
{% load wagtailcore_tags %}
{% block body_class %}template-blogpage{% endblock %}
{% block content %}
<h1>{{ page.title }}</h1>
<p class="meta">{{ page.date }}</p>
<div class="intro">{{ page.intro }}</div>
{{ page.body }}
<p><a href="{{ page.get_parent.url }}">Return to blog</a></p>
{% endblock %}