如何在模板中获取ModelChoiceField实例

问题描述

我有一个ModelForm包含一个ModelChoiceField，使用RadioSelect小部件。

  class MyAForm（forms.ModelForm）：
 one_property = models.ModelChoiceField（
 widget = forms.RadioSelect，
 queryset = MyBModel.objects.filter（visible = True），
 empty_label = None）
 class Meta： 
 model = MyAModel 
  

MyBModel上有要显示在收音机旁边的属性按钮。我将在ModelChoiceField的子类上覆盖 label_from_instance ，但是这不允许我做我想要的，因为我想要单选按钮出现在一个有行的表中对于每个选择项目。

所以在我的模板中的某个地方我想要的东西...

  {％for form.visible_fields％} 
 {％if field.name ==one_property％} 
< table> 
 {％for field.choices％} 
< tr> 
< td>< input value ={{choice.id}}type =radioname =one_property/>{{choice.description}}</td> 
< td>< img src ={{choice.img_url}}/>< / td> 
< / tr> 
 {％endfor％} 
< / table> 
 {％endif％} 
 {％endfor％} 
  

不幸的是。选择返回对象的id和标签的元组，而不是查询器中的实例。

有没有一种简单的方法来获取一个ModelChoiceField的选项的实例在一个模板中？

解决方案

在深入研究ModelChoiceField的django源之后，我发现它有一个属性queryset。 >

我可以使用类似...

  {％for field在form.visible_fields％} 
 {％if field.name ==one_property％} 
< table> 
 {％for field.queryset％} 
< tr> 
< td>< input value ={{choice.id}}type =radioname =one_property/>{{choice.description}}</td> 
< td>< img src ={{choice.img_url}}/>< / td> 
< / tr> 
 {％endfor％} 
< / table> 
 {％endif％} 
 {％endfor％} 
  

I have a ModelForm that contains a ModelChoiceField using the RadioSelect widget.

class MyAForm(forms.ModelForm):
    one_property = models.ModelChoiceField(
        widget=forms.RadioSelect,
        queryset=MyBModel.objects.filter(visible=True),
        empty_label=None)
    class Meta:
        model = MyAModel

There are attributes on MyBModel that I want to display next to the radio button. I would override label_from_instance on a sub-class of ModelChoiceField but this does not allow me to do what I want as I want the radio button to appear inside a table which has a row for each selection item.

So somewhere in my template I want something like...

{% for field in form.visible_fields %}
    {% if field.name == "one_property" %}
    <table>
        {% for choice in field.choices %}
            <tr>
                <td><input value="{{choice.id}}" type="radio" name="one_property" />{{choice.description}}</td>
                <td><img src="{{choice.img_url}}" /></td>
            </tr>
        {% endfor %}
    </table>
    {% endif %}
{% endfor %}

Unfortunately field.choices returns a tuple of the object's id and the label and not an instance from the queryset.

Is there a simple way to get instances of the choices for a ModelChoiceField to use within a template?

解决方案

After delving into the django source for ModelChoiceField I discovered it has a property "queryset".

I was able to use something like...

{% for field in form.visible_fields %}
    {% if field.name == "one_property" %}
    <table>
        {% for choice in field.queryset %}
            <tr>
                <td><input value="{{choice.id}}" type="radio" name="one_property" />{{choice.description}}</td>
                <td><img src="{{choice.img_url}}" /></td>
            </tr>
        {% endfor %}
    </table>
    {% endif %}
{% endfor %}

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