在Django内联模型管理中，如何用值预先填充额外的字段

Question

class MyCustomInline(admin.TabularInline):
    min_num = 1
    extra = 0
    fields = ['matcher', 'param0', 'param1']
    model = MyModel
    form = MyCustomInlineForm

   def get_formset(self, request, obj=None, **kwargs):
        extra_fields = {
            'param0': forms.CharField(label='First Param', required=False),
            'param1': forms.CharField(label='Second Param', required=False)
        }
        kwargs['form'] = type('MyCustomInline', (MyCustomInlineForm,), extra_fields)
        return super(MyCustomInline, self).get_formset(request, obj, **kwargs)

这就是我定义内联表单的基本方式，以便它有两个额外的字段matcher是相关表中的标准字段，内联表单会自动处理它。我通过重写MyCustomInlineForm中的save()，将额外的param值保存在不同的存储器中。在

但是如果我编辑了一个现有的记录匹配器值，那么我显然还想用相应的值预加载param0和param1。我在哪能联系上呢？在

Answer 1

我自己设法做到的。我还设法简化了自定义额外字段的定义方式，而不重写get_formset方法：

class MyCustomInlineForm(forms.ModelForm):
    matcher = forms.ChoiceField(choices=[(v['name'], v['name']) for v in matchers], label='Matcher')
    param0 = forms.CharField(label='First Param', required=False)
    param1 = forms.CharField(label='Second Param', required=False)

    def __init__(self, *args, **kwargs):
        super(MyCustomInlineForm, self).__init__(*args, **kwargs)
        if self.instance.pk:
            """ self.instance is the model for the current row.
                If there is a pk property that is not None, it means it's not
                a new, empty inline model but we are working with existing one."""
            self.initial['param0'], self.initial['param1'] = custom_way_to_load_params(self.instance)

    def save(self, commit=True):
        model = super(MyCustomInlineForm, self).save(True)
        param0 = self.cleaned_data['param0']
        param1 = self.cleaned_data['param1']
        custom_way_to_save_params(model, param0, param1)
        return model



class MyCustomInline(admin.TabularInline):
    min_num = 1
    extra = 0
    fields = ['matcher', 'param0', 'param1']
    model = MyModel
    form = MyCustomInlineForm

如果需要-自定义参数的验证可以通过重写forms.ModelForm类的is_valid()方法并通过self.add_error()添加错误来完成。我希望它能帮助别人。在