python Django ModelForm CheckBox 小部件

Django ModelForm CheckBox Widget

提问by f4nt

I'm currently have an issue, and likely overlooking something very trivial. I have a field in my model that should allow for multiple choices via a checkbox form (it doesn't have to be a checkbox in the admin screen, just in the form area that the end-user will see). Currently I have the field setup like so:

我目前有一个问题，可能忽略了一些非常微不足道的事情。我的模型中有一个字段，它应该允许通过复选框表单进行多项选择（它不必是管理屏幕中的复选框，只需在最终用户将看到的表单区域中）。目前我的字段设置如下：

# Type of Media
MEDIA_CHOICES = (
    ('1', 'Magazine'),
    ('2', 'Radio Station'),
    ('3', 'Journal'),
    ('4', 'TV Station'),
    ('5', 'Newspaper'),
    ('6', 'Website'),
)
media_choice = models.CharField(max_length=25,
    choices=MEDIA_CHOICES)

I need to take that and make a checkbox selectable field in a form out of it though. When I create a ModelForm, it wants to do a drop down box. So I naturally overrode that field, and I get my checkbox that I want. However, when the form's submitted, it would appear that nothing useful is saved when I look at the admin screen. The database does however show that I have a number of things selected, which is a positive sign. However, how can I get that to reflect in the admin screen properly?

不过，我需要接受它并在表单中创建一个复选框可选字段。当我创建一个 ModelForm 时，它想做一个下拉框。所以我自然而然地覆盖了那个字段，我得到了我想要的复选框。但是，当表单提交时，当我查看管理屏幕时，似乎没有保存任何有用的内容。然而，数据库确实显示我选择了许多东西，这是一个积极的信号。但是，我怎样才能让它正确地反映在管理屏幕中？

Edit: FWIW I'll gladly accept documentation links as answers, because it would seem I'm just glossing over something obvious.

编辑：FWIW 我很乐意接受文档链接作为答案，因为看起来我只是在掩盖一些明显的东西。

回答by Benjamin Wohlwend

In such a case, the easiest way is to put the choices into a separate model and then use a ManyToMany relationship. After that, you simply override the ModelForm's widget for that field to use forms.CheckboxSelectMultipleand Django will automatically do the right thing. If you insist to use a CharField, you'll probably have to do something like this snippet.

在这种情况下，最简单的方法是将选项放入单独的模型中，然后使用多对多关系。之后，您只需覆盖该字段的 ModelForm 小部件以使用forms.CheckboxSelectMultiple，Django 将自动执行正确的操作。如果您坚持使用 CharField，则可能必须执行类似此代码段的操作。

@ 2. comment: how are you overriding the widget? This is how I do it and it works flawlessly:

@ 2. 评论：你是如何覆盖小部件的？这就是我的工作方式，它完美无缺：

class SomeModelForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        super(SomeModelForm, self).__init__(*args, **kwargs)
        self.fields['some_field'].widget = forms.CheckboxSelectMultiple()

回答by monkut

I've just started to look into widgets assignment with ModelForms. In a lot of examples I've seen, piquadrat's included, the Form's __ init __ method is overridden.

我刚刚开始研究 ModelForms 的小部件分配。在我见过的很多例子中，包括 piquadrat，Form 的 __ init __ 方法被覆盖。

I find this a little confusing, and just overriding the desired field is more natural for me:

我觉得这有点令人困惑，只是覆盖所需的字段对我来说更自然：

class SomeModelForm(forms.ModelForm):
    some_field = forms.CharField(choices=MEDIA_CHOICES,
                                 widget=forms.CheckboxSelectMultiple)
    class Meta:
        model=SomeModel

Note: I'm using Django 1.1.

注意：我使用的是 Django 1.1。

回答by andrea

Using piquadrat's answer worked for me, but needed to add a line to define the queryset for the M2M. See this link.

使用 piquadrat 的答案对我有用，但需要添加一行来定义 M2M 的查询集。请参阅此链接。