python - django-simple-history, displaying changed fields in admin

Question

When I inherit from admin.ModelAdmin, in history on admin page I can see what fields has been changed. However, now I need to use django-simple-history to track all my model changes. Now, for admin, I inherit for simple_history.SimpleHistoryAdmin. Whilst I can see all of the model changes and revert them, I cannot see, which fields were changed. Is it possible to add that handy functionality to SimpleHistoryAdmin?

Answer 1

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 表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

Answer 2

您需要的是history_list_display管理员中的字段。包含在其中的字段列表history_list_display将显示在历史页​​面中，并带有相应的条目。

像这样的东西：

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field1,field2和comment,user和reason

Answer 3

如果您不仅要查看根据 Rafi 注释更改的字段的名称以及更改的值，则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

Answer 4

与 Rafi 之前的解决方案类似，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))