[英]Using modelformset_factory and access attributes of an object
I have some Container
s and they have a number of Box
es I want to edit. 我有一些
Container
,它们有许多Box
我想编辑。 So, naturally, I use modelformset_factory . 因此,自然地,我使用modelformset_factory 。
It works very good: 效果很好:
container = get_object_or_404(Container, id=container_id)
BoxFormSet = modelformset_factory(Box, fields=('a', 'b', 'c'))
formset = BoxFormSet(queryset=container.box_set.all())
In my template I iterate over formset
to show the boxes I want to modify. 在我的模板中,我遍历
formset
以显示要修改的框。
This works very well and I can edit the attributes a
, b
and c
of each Box
. 这很好用,我可以编辑每个
Box
的属性a
, b
和c
。 But each box has also a label
. 但是每个盒子上也有一个
label
。 I want to access the value to show it in the label but it should not be editable, like an input
-field. 我想访问该值以在标签中显示它,但它不应像
input
-field一样可编辑。 I just need the value. 我只需要价值。 How can I achieve that?
我该如何实现?
You can pass a widgets
parameter to the factory. 您可以将
widgets
参数传递给工厂。 There you can specify the appropriate attribute for the label input: 您可以在此处为标签输入指定适当的属性:
BoxFormSet = modelformset_factory(
Box,
fields=('a', 'b', 'c', 'label'),
widgets={'label': forms.TextInput(attrs={'readonly': True})}
)
Alternatively, if you don't want a auto-rendered, yet disabled input, you can just access the label in the template via the form's instance: 另外,如果您不希望自动呈现但已禁用的输入,则可以通过表单的实例访问模板中的标签:
{% for form in box_formset %}
# form stuff
{{ form.instance.label }}
{% endfor %}
I'd recommend specifying a form to use for the model, and in that form you can set whatever attributes you want to read-only. 我建议指定一个用于模型的表单,在该表单中,您可以设置任何要只读的属性。
#forms.py
class BoxForm(forms.ModelForm):
class Meta:
model = Box
fields=('a', 'b', 'c', 'label')
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
if self.instance.id:
self.fields['label'].widget.attrs['readonly'] = True
#views.py
BoxFormSet = modelformset_factory(Box, form=BoxForm)
An alternative would be to set those fields as read-only using javascript 一种替代方法是使用javascript将这些字段设置为只读
$('input[name="label"]').attr('readonly', true);
Personally, I would prefer the first 就个人而言,我希望第一个
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