Django管理员：如何从GET变量填充一个新对象？ [英] Django admin: How to populate a new object from GET variables?

问题描述

在Django的管理员中，我已经看到了如何使用GET变量设置添加对象表单的字段（例如 / admin / app / model / add？title = lol 将'标题'字段设置为'lol'）。

In Django's admin, I've seen how I can set the fields of an 'add object' form using GET variables (e.g. /admin/app/model/add?title=lol sets the 'Title' field to 'lol').

但是，我想要能够按照 / admin / app / model / add？key = 18 并从另一个模型的实例加载我的字段的默认数据。理想情况下，我也希望能够对我填写表单的值进行一些处理。我该怎么做？

However, I want to be able to do something along the lines of /admin/app/model/add?key=18 and load default data for my fields from an instance of another model. Ideally, I'd also like to be able to do some processing on the values that I populate the form with. How do I do this?

推荐答案

我设法弄清楚了。覆盖整个 add_view 方法似乎对我来说太过分了。幸运的是，Django允许您替换请求的 GET dict（它用于预先填充管理表单）。以下为我工作：

I managed to figure it out. Overriding the entire add_view method seemed like too much clutter to me. Thankfully, Django allows you to replace a request's GET dict (which it uses to pre-populate the admin form). The following worked for me:

class ArticleAdmin(admin.ModelAdmin):
    // ...

    def add_view(self, request, form_url='', extra_context=None):
        source_id = request.GET.get('source',None)
        if source_id != None:
            source = FeedPost.objects.get(id=source_id)
            // any extra processing can go here...
            g = request.GET.copy()
            g.update({
                'title':source.title,
                'contents':source.description + u"... \n\n[" + source.url + "]",
            })

            request.GET = g

        return super(ArticleAdmin, self).add_view(request, form_url, extra_context)

这样，我从URL中的一个参数中获取'source'对象，加载我需要的值，做我想要的他们，并预先填写表单。

This way, I obtain the 'source' object from a parameter in the URL, load the values I need from it, do what I want with them, and pre-populate the form.

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