如何使用ModelForm过滤Django表单中的值？ [英] How do I filter values in a Django form using ModelForm?

问题描述

我正在尝试使用ModelForm来添加我的数据。它工作得很好，除了外键下拉列表显示所有值，我只希望它显示与登录用户相关的值。

I am trying to use the ModelForm to add my data. It is working well, except that the ForeignKey dropdown list is showing all values and I only want it to display the values that a pertinent for the logged in user.

这里是我的模型为ExcludedDate，我要添加的记录：

Here is my model for ExcludedDate, the record I want to add:

class ExcludedDate(models.Model):
date = models.DateTimeField()
reason = models.CharField(max_length=50)
user = models.ForeignKey(User)
category = models.ForeignKey(Category)
recurring = models.ForeignKey(RecurringExclusion)
def __unicode__(self):
    return self.reason

这是类别的模型，它是包含我想要用户限制的关系的表：

Here is the model for the category, which is the table containing the relationship that I'd like to limit by user:

class Category(models.Model):
name = models.CharField(max_length=50)
user = models.ForeignKey(User, unique=False)
def __unicode__(self):
    return self.name

最后，表单代码：

class ExcludedDateForm(ModelForm):
class Meta:
    model = models.ExcludedDate
    exclude = ('user', 'recurring',)

如何让表单只显示类别的子集其中category.user等于登录用户？

How do I get the form to display only the subset of categories where category.user equals the logged in user?

推荐答案

您可以在 init / p>

You can customize your form in init

class ExcludedDateForm(ModelForm):
    class Meta:
        model = models.ExcludedDate
        exclude = ('user', 'recurring',)
    def __init__(self, user=None, **kwargs):
        super(ExcludedDateForm, self).__init__(**kwargs)
        if user:
            self.fields['category'].queryset = models.Category.objects.filter(user=user)

而且，在构建表单时，除了标准表单参数外，还可以指定当前用户：

And in views, when constructing your form, besides the standard form params, you'll specify also the current user:

form = ExcludedDateForm(user=request.user)

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