带有父类别的 Django 多项选择表
我有一个如下所示的简单模型：
class Neighborhood(models.Model):
name = models.CharField(max_length=255)
borough = models.ForeignKey(Borough)
def __unicode__(self):
return self.name
在我的 forms.py 文件中，我有一个使用选项呈现的简单表单：
class SearchForm(forms.Form):
neighborhood = forms.ModelMultipleChoiceField(required=False, queryset=Neighborhood.objects.all(), widget=CheckboxSelectMultiple())
这很好，并列出了我的 Neighborhood 模型中的所有选项。它看起来像这样：
- 下东区
- 时代广场
- 东村西村
- ...等
但是，我想列出社区的父类别，在本例中为行政区。所需的外观将如下所示：
布鲁克林
- 威廉斯堡
- 小飞象
- ...
- 曼哈顿
- 下东区
- 时代广场
- 西村
- 东村
- 皇后 区
- ...
我尝试调用这两个不同的对象并将它们组合成一个自定义列表，但是我无法通过查询集传递它，因为它给了我一个 AttributeError ，因为没有“全部”可用。
还有其他方法可以做到这一点吗？
I have a simple model that looks like this:
class Neighborhood(models.Model):
name = models.CharField(max_length=255)
borough = models.ForeignKey(Borough)
def __unicode__(self):
return self.name
In my forms.py file, I have a simple form being rendered with the options:
class SearchForm(forms.Form):
neighborhood = forms.ModelMultipleChoiceField(required=False, queryset=Neighborhood.objects.all(), widget=CheckboxSelectMultiple())
This is fine and lists out all the options in my Neighborhood model. It looks something like this:
- Lower East Side
- Times Square
- East Village
- West Village
...etc
However, I would like to list the parent category of the neighborhood, in this case the borough. The desired look would be like this:
Brooklyn
- Williamsburg
- DUMBO
- ...
- Manhattan
- Lower East Side
- Times Square
- West Village
- East Village
- Queens
- ...
I've tried to call the two different objects and combine them into a custom list, however I'm not able to pass that through the queryset as it gave me an AttributeError for not having 'all' available.
Is there another way to do this?
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评论（2）
我认为最好的方法是为其编写自定义表单小部件。
简单（也不错）的方法是手动在模板中输出
The best way, I think, is to write custom form widget for it.
Simple (and not bad too) way is to output
<select>tag in template manually. regroup filter will do all the job.对于未来走同样道路的人：
我发现 此链接，其中解释了如何通过创建自定义 ModelChoiceIterator（负责为选择字段创建选择元组的类）并使其包含父类别来实现此目的。
PS 作者创建了一个使用新迭代器的新 ModelChoiceField，但我相信您现在可以使用 ModelChoiceField 和 ModelMultipleChoiceField 的迭代器参数简单地设置自定义迭代器（文档链接）
For future people going down the same path:
I found this link where it explains how to do it by creating a custom ModelChoiceIterator (the class responsible for making the choices tuple for choice fields) and making it include the parent category.
P.S. The author creates a new ModelChoiceField that uses the new iterator, but I believe you can now simply set a custom iterator using the iterator argument of both ModelChoiceField and ModelMultipleChoiceField (link to docs)