模型limit_choices_to = {'user'：user} [英] Model limit_choices_to={'user': user}

问题描述

我去了所有的文档，我也去了IRC频道（BTW一个伟大的社区），他们告诉我，不可能创建一个模型，并限制在当前用户在一个字段中的选择ForeignKey的。
我将尝试解释一个例子：

  class Project（models.Model）：
 name = models.CharField（max_length = 100）
 employees = models.ManyToManyField（Profile，limit_choices_to = {'active'：'1'}）
 
 class TimeWorked（models.Model） 
 project = models.ForeignKey（Project，limit_choices_to = {'user'：user}）
 hours = models.PositiveIntegerField（）
  

当然，该代码不起作用，因为没有用户对象，但这是我的想法，我正在尝试将对象用户发送到模型限制当前用户有项目的选择，我不想看到我不在的项目。

非常感谢，如果您可以帮助我或给我任何建议，我不想你写所有的应用程序，只是一个提示如何处理。我有两天在我的脑海里，我无法弄清楚：（

更新：解决方案在这里： http://collingrady.wordpress.com/2008/07 / 24 / useful-form-tricks-in-django / 将 request.user 发送到模型。

解决方案

如果您希望获取编辑此模型的当前用户，请使用threadlocals。Threadlocals中间件将当前用户置于流程范围的变量中，从




$ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ b return getattr（getthr（_thread_locals，'user'，None），'id'，None）

class ThreadLocals（object）：
中间件从
请求对象并将其保存在线程本地存储中。
def process_request（self，req uest）：
_thread_locals.user = getattr（request，'user'，None）

检查有关如何使用中间件类的文档。然后你可以在代码中的任何地方调用

  user = threadlocals.get_current_user 
  

I went to all the documentation, also I went to the IRC channel (BTW a great community) and they told me that is not possible to create a model and limit choices in a field where the 'current user' is in a ForeignKey. I will try to explain this with an example:

class Project(models.Model):
  name = models.CharField(max_length=100)
  employees = models.ManyToManyField(Profile, limit_choices_to={'active': '1'})

class TimeWorked(models.Model):
  project = models.ForeignKey(Project, limit_choices_to={'user': user})
  hours = models.PositiveIntegerField()

Of course that code doesn't work because there is no 'user' object, but that was my idea and I was trying to send the object 'user' to the model to just limit the choices where the current user has projects, I don't want to see projects where I'm not in.

Thank you very much if you can help me or give me any advice, I don't want to you write all the app, just a tip how to deal with that. I have 2 days with this in my head and I can't figure it out :(

UPDATE: The solution is here: http://collingrady.wordpress.com/2008/07/24/useful-form-tricks-in-django/ sending request.user to a model.

解决方案

Use threadlocals if you want to get current user that edits this model. Threadlocals middleware puts current user into process-wide variable. Take this middleware

from threading import local

_thread_locals = local()
def get_current_user():
    return getattr(getattr(_thread_locals, 'user', None),'id',None)

class ThreadLocals(object):
    """Middleware that gets various objects from the
    request object and saves them in thread local storage."""
    def process_request(self, request):
        _thread_locals.user = getattr(request, 'user', None)

Check the documentation on how to use middleware classes. Then anywhere in code you can call

user = threadlocals.get_current_user

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