django-simple-history,在管理中显示更改的字段

django-simple-history, displaying changed fields in admin

当我从 admin.ModelAdmin 继承时,在管理页面的历史记录中,我可以看到更改了哪些字段。但是,现在我需要使用 django-simple-history 来跟踪我所有的模型更改。现在,对于管理员,我继承 simple_history.SimpleHistoryAdmin。虽然我可以看到所有模型更改并还原它们,但我看不到哪些字段已更改。是否可以将这个方便的功能添加到 SimpleHistoryAdmin?

您需要的是管理员中的 history_list_display 字段。 history_list_display 中包含的字段列表及其相应的条目将显示在历史页​​面中。

像这样:

class SomeAdmin(admin.ModelAdmin):

    def some_user_defined(self, obj):
        return "something"

    date_hierarchy = 'created_at'
    search_fields = ['field1', 'field2']
    list_display = ('field1', 'field2',)
    list_filter = ('field1',)
    history_list_display = ('field1', 'field2', 'some_user_defined',)

这将显示 field1field2 以及 commentuserreason

我找到了解决这个问题的方法。我添加了一个 ModelAdmin 方法并使用 History Diffing 在 Change history table.

中添加了一个自定义字段
history_list_display = ['changed_fields']

def changed_fields(self, obj):
    if obj.prev_record:
        delta = obj.diff_against(obj.prev_record)
        return delta.changed_fields
    return None

如果您不仅要根据 Rafi 评论查看更改字段的名称,还要查看更改的值,下一个代码将执行此操作:

def changed_fields_with_values(self, obj):
    fields = ""
    if obj.prev_record:
        delta = obj.diff_against(obj.prev_record)

        for change in delta.changes:
            fields += str("{} changed from {} to {}".format(change.field, change.old, change.new))
        return fields
    return None

类似于 Rafi 之前的解决方案,但使用数组更优雅地列出记录更改:

def list_changes(self, obj):
    diff = []
    if obj.prev_record:
        delta = obj.diff_against(obj.prev_record)

        for change in delta.changes:
            diff.append("<b>* {}:</b> changed from `{}` to `{}`".format(change.field, change.old, change.new))

    return mark_safe("\n<br>".join(diff))

你可能想做这样的事情:

# admin.py

from django.contrib import admin
from simple_history.admin import SimpleHistoryAdmin
from .models import Website
from django.utils.html import format_html


class WebsiteHistoryAdmin(SimpleHistoryAdmin):
    history_list_display = ["changed_fields","list_changes"]
    
    def changed_fields(self, obj):
        if obj.prev_record:
            delta = obj.diff_against(obj.prev_record)
            return delta.changed_fields
        return None

    def list_changes(self, obj):
        fields = ""
        if obj.prev_record:
            delta = obj.diff_against(obj.prev_record)

            for change in delta.changes:
                fields += str("<strong>{}</strong> changed from <span style='background-color:#ffb5ad'>{}</span> to <span style='background-color:#b3f7ab'>{}</span> . <br/>".format(change.field, change.old, change.new))
            return format_html(fields)
        return None


admin.site.register(Website, WebsiteHistoryAdmin)

结果是: