模型 limit_choices_to={'user'： user}-解网

问：

我去了所有的文档，也去了 IRC 频道（顺便说一句，一个很棒的社区），他们告诉我，在“当前用户”位于 ForeignKey 的字段中创建模型并限制选择是不可能的。我将尝试用一个例子来解释这一点：

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，我试图将对象“用户”发送到模型，以限制当前用户有项目的选择，我不想看到我不在的项目。

如果您能帮助我或给我任何建议，非常感谢您，我不希望您编写所有应用程序，只是如何处理的提示。我有 2 天的时间在我的脑海中，我无法弄清楚:(

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

Python Django 模型

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)

查看有关如何使用中间件类的文档。然后，您可以在代码中的任何位置调用

user = threadlocals.get_current_user

from datetime import datetime, timedelta
from django import forms
from mysite.models import Project, TimeWorked

class TimeWorkedForm(forms.ModelForm):
    def __init__(self, user, *args, **kwargs):
        super(ProjectForm, self).__init__(*args, **kwargs)
        self.fields['project'].queryset = Project.objects.filter(user=user)

    class Meta:
        model = TimeWorked

那么在你看来：

def time_worked(request):
    form = TimeWorkedForm(request.user, request.POST or None)
    if form.is_valid():
        obj = form.save()
        # redirect somewhere
    return render_to_response('time_worked.html', {'form': form})

1赞 Stephen G Tuggy 3/28/2019 #6

在 Django 1.8.x / Python 2.7.x 中使用基于类的泛型视图，这是我和我的同事想出的：

在 models.py：

# ...

class Proposal(models.Model):
    # ...

    # Soft foreign key reference to customer
    customer_id = models.PositiveIntegerField()

    # ...

在 forms.py：

# -*- coding: utf-8 -*-
from __future__ import unicode_literals

from django.forms import ModelForm, ChoiceField, Select
from django import forms
from django.forms.utils import ErrorList
from django.core.exceptions import ValidationError
from django.utils.translation import ugettext as _
from .models import Proposal
from account.models import User
from customers.models import customer



def get_customers_by_user(curUser=None):
    customerSet = None

    # Users with userType '1' or '2' are superusers; they should be able to see
    # all the customers regardless. Users with userType '3' or '4' are limited
    # users; they should only be able to see the customers associated with them
    # in the customized user admin.
    # 
    # (I know, that's probably a terrible system, but it's one that I
    # inherited, and am keeping for now.)
    if curUser and (curUser.userType in ['1', '2']):
        customerSet = customer.objects.all().order_by('company_name')
    elif curUser:
        customerSet = curUser.customers.all().order_by('company_name')
    else:
        customerSet = customer.objects.all().order_by('company_name')

    return customerSet


def get_customer_choices(customerSet):
    retVal = []

    for customer in customerSet:
        retVal.append((customer.customer_number, '%d: %s' % (customer.customer_number, customer.company_name)))

    return tuple(retVal)


class CustomerFilterTestForm(ModelForm):

    class Meta:
        model = Proposal
        fields = ['customer_id']

    def __init__(self, user=None, *args, **kwargs):
        super(CustomerFilterTestForm, self).__init__(*args, **kwargs)
        self.fields['customer_id'].widget = Select(choices=get_customer_choices(get_customers_by_user(user)))

# ...

在 views.py：

# ...

class CustomerFilterTestView(generic.UpdateView):
    model = Proposal
    form_class = CustomerFilterTestForm
    template_name = 'proposals/customer_filter_test.html'
    context_object_name = 'my_context'
    success_url = "/proposals/"

    def get_form_kwargs(self):
        kwargs = super(CustomerFilterTestView, self).get_form_kwargs()
        kwargs.update({
            'user': self.request.user,
        })
        return kwargs

在 templates/proposals/customer_filter_test.html：

{% extends "base/base.html" %}

{% block title_block %}
<title>Customer Filter Test</title>
{% endblock title_block %}

{% block header_add %}
<style>
    label {
        min-width: 300px;
    }
</style>
{% endblock header_add %}

{% block content_body %}
<form action="" method="POST">
    {% csrf_token %}
    <table>
        {{ form.as_table }}
    </table>
    <input type="submit" value="Save" class="btn btn-default" />
</form>
{% endblock content_body %}

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模型 limit_choices_to={'user'： user}

Model limit_choices_to={'user': user}

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