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 添加我的数据.它运行良好，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.

这是我的 ExcludedDate 模型，我想添加的记录:

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，它是包含我想按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

最后是表单代码:

class ExcludedDateForm(ModelForm):

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

如何让表单仅显示 category.user 等于登录用户的类别子集?

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

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)

在视图中，在构建表单时，除了标准表单参数外，您还将指定当前用户:

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

form = ExcludedDateForm(user=request.user)

这篇关于如何使用 ModelForm 过滤 Django 表单中的值?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！