限制为django admin内联显示的条目的查询 [英] Limit the queryset of entries displayed for a django admin Inline

问题描述

在django管理员中，使用django 1.2，我尝试添加一个InlineModelAdmin，以便在对条目进行更改时对保存应用注释。 （一个条目预计每个编辑都有一个ChangeComment）。

In django admin, using django 1.2, i'm trying to add a InlineModelAdmin to apply a comment on save when a change is made to an entry. (An entry is expected to have a "ChangeComment" for every edit).

我不想显示以前的条目，所以我试图强制 ChangeCommentInline 的formset.queryset为空，通过在 ChangeCommentInline 中创建 NoCommentsInlineFormset 并分配表单，但仍返回现有条目。

I don't want to show previous entries, so I am trying to force the ChangeCommentInline's formset.queryset to be empty, by creating NoCommentsInlineFormset and assigning the formset in my ChangeCommentInline, but is still returning existing entries.

https://docs.djangoproject.com/en/1.3/topics/forms/modelforms/#changing-the-queryset

注 - 在链接中上面他们使用了 BaseModelFormset ，我使用的是BaseInlineFormset ，我期望可能是这个问题。如果我使用 BaseModelFormset 将BaseInlineFormset 交换出来，我将收到一个关于实例不存在的错误。

Note - In the link above they use BaseModelFormset, I'm using BaseInlineFormset, which I expect may be the issue. If I swap out BaseInlineFormset with BaseModelFormset I get an error about "instance" not existing.

admin.py

class NoCommentsInlineFormset(models.BaseInlineFormset):
    def __init__(self, *args, **kwargs):
        super(NoCommentsInlineFormset, self).__init__(*args, **kwargs)
        self.queryset = ChangeComment.objects.none()


class ChangeCommentInline(admin.StackedInline):
    model = ChangeComment
    extra = 1
    exclude = ("user", )
    formset = NoCommentsInlineFormset

    def save_model(self, request, obj, form, change):
        """auto-assign logined in user to comment"""
        if not change:
            obj.user = request.user
        obj.save()    


class EntryAdmin(admin.ModelAdmin):   
    inlines = (ChangeCommentInline, )

可以限制ChangeComment en或者是否有更好的方式来处理这个问题？

Can limiting the ChangeComment entries displayed in the Inline be done, or is there a better way to handle this?

推荐答案

正如在评论中提到的benjaoming一样，有必要覆盖 InlineModelAdmin 中的 get_queryset（）方法。最初没有必要重写和附加一个新的formset到 InlineModelAdmin 定义。

As benjaoming mentioned in the comments, it was necessary to override the get_queryset() method in the InlineModelAdmin. It was not necessary to override and attach a new formset to the InlineModelAdmin definition as I initially thought.

这里是最终实现：

class ChangeCommentInline(admin.StackedInline):
    """For allowing logged in user to add change comment"""
    model = ChangeComment
    extra = 1
    exclude = ("user", ) # auto-update user field in save_formset method of parent modeladmin.


    def get_queryset(self, request):
        """Alter the queryset to return no existing entries"""
        # get the existing query set, then empty it.
        qs = super(ChangeCommentInline, self).get_queryset(request)
        return qs.none()  

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