如何在Django管理员中实现全局隐式过滤器？ [英] How can I implement a global, implicit filter in Django admin?

问题描述

很多我的模型都有一个公司模式的外键。每个登录用户都可以是一个或多个公司的一部分（用户m2m公司，不为null）。

我希望当前的管理员用户有公司护目镜 ，即选择列表，在管理员索引页面上，或者也可以是基本标题，可以在其中切换其当前公司。除了任何其他过滤器之外，这样做应该自动应用公司等于过滤器 - 对于具有外部公钥的型号。

什么是最佳实现方式这个？

注意：这是管理界面的舒适功能，在这个阶段实际保护模型是不必要的（客户端视图需要，但我可以只需使用自定义管理器并通过request.user查找）。

我目前的想法是：

1. 将当前公司存入会议中。




2. 使用中间件从会话中查找当前公司，并将公司附加到所有相关链接：

   
   
   

   a）change_list：（？/&）company__eq = 42

   
   
   

   b）change_view add？company = 42表示具有外键的模型给公司。

   
   
   

   这可能需要反转或模式匹配URL来查找他们的模型并检查它存在外键（或者我可能准备该列表预先提高性能）




3. 在每个ModelAdmin中包含外键字段，但通过CSS隐藏，以使change_view add（new）包括

你觉得这是一个可行的方法吗？ >

如果 http://code.djangoproject.com/ticket/ 10761 被执行，我想我可以指定一个自定义查询器，它从request.session读取当前的公司，并完成它。或者可能只需要在需要它的每个ModelAdmin上重新定义一个queryset（）方法，有外键？

解决方案

我的投票是覆盖 ModelAdmin.queryset ，因为您方便地访问该请求。对于第3点覆盖 save_model

  class MyModelAdmin（admin.ModelAdmin） ：
 def queryset（self，request）：
 qs = super（MyModelAdmin，self）.queryset（request）
如果request.session.get（'company_goggles'）：
 return qs.filter（company = request.session ['company_goggles']）
 return qs 
  

如果你有很多模型，我会将 ModelAdmin 子类化为 GogglesAdmin 并定义一个字段/默认值来拉现场名称以及公司预先自动注入。

  class CompanyGogglesAdmin（admin.ModelAdmin）：
 def queryset（self，request）：
 qs = super（CompanyGoggleAdmin，self）.queryset（request）
如果request.session.get（'company_goggles'）：
 return qs.filter（** {getattr（self，'company_field'，'company' ）：
 request.session ['company_goggles']}）
  

顺便说一句，真的很喜欢这个公司护目镜术语。

A lot of my models have a foreign key to a "Company" model. Every logged in user can be part of one or more companies (User m2m Company, not null).

I would like the current admin user to have "Company goggles" on, i.e. a select list, on the admin index page or maybe the base header, where they can switch their "current" Company. Doing that should automatically apply a "company equals" filter - for models that have a foreign key to Company - in addition to any other filters.

What's the best way to achieve this?

NB: This is meant as a comfort function for the admin interface, actual protection of models is not necessary at this stage (client views do need that but I can just use a custom Manager and lookup via request.user there).

My current idea is:

1. Store current company in session.

2. Use middleware to look up current company from session, and append the company to all relevant links:

   a) change_list: (?/&)"company__eq=42"

   b) change_view "add?company=42" for models that have a foreign key to Company.

   This may require to reverse or pattern match the URLs to find out their model and check it for presence of the foreign key (or I might prepare that list beforehand to improve performance).

3. Include in each ModelAdmin form the foreign key field, but hide it via CSS, so that change_view add ("new") includes the preset foreign key value from the link without mentioning it.

Do you find this a viable approach?

If http://code.djangoproject.com/ticket/10761 was implemented I guess I could just specify a custom queryset which reads the current company from request.session and be done with it. Maybe better to fast-track (=make and submit patch) that ticket instead?

EDIT: or maybe just redefine the queryset() method on every ModelAdmin that needs it / has the foreign key?

解决方案

My vote is is for overriding ModelAdmin.queryset, since you conveniently have access to the request there. Override save_model for point 3.

 class MyModelAdmin(admin.ModelAdmin):
    def queryset(self, request):
        qs = super(MyModelAdmin, self).queryset(request)
        if request.session.get('company_goggles'):
             return qs.filter(company=request.session['company_goggles'])
        return qs

If you have many models, I'd subclass ModelAdmin as something like GogglesAdmin and define a field / default to pull the fieldname from and also the pre-save auto injecting of company.

class CompanyGogglesAdmin(admin.ModelAdmin):
    def queryset(self, request):
        qs = super(CompanyGoggleAdmin, self).queryset(request)
        if request.session.get('company_goggles'):
            return qs.filter(**{ getattr(self, 'company_field', 'company') : 
                          request.session['company_goggles'] })

By the way, I really like this "company goggles" terminology.

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