带有 Mongodb 列表字段的 Django-Nonrel

Question

我正在尝试在 mongodb 上的 django-nonrel 中实现多字段关系。建议在：

Django-nonrel form field for ListField

按照接受的答案

models.py

class MyClass(models.Model):
    field = ListField(models.ForeignKey(AnotherClass))

我不确定以下内容的去向，它已经在 fields.py、widgets、py、models.py 中进行了测试

class ModelListField(ListField):
    def formfield(self, **kwargs):
    return FormListField(**kwargs)

class ListFieldWidget(SelectMultiple):
    pass

class FormListField(MultipleChoiceField):
    """
    This is a custom form field that can display a ModelListField as a Multiple Select GUI element.
    """
    widget = ListFieldWidget

    def clean(self, value):
    #TODO: clean your data in whatever way is correct in your case and return cleaned data instead of just the value
    return value

admin.py

class MyClassAdmin(admin.ModelAdmin):
    form = MyClassForm

    def __init__(self, model, admin_site):
    super(MyClassAdmin,self).__init__(model, admin_site)

admin.site.register(MyClass, MyClassAdmin)

以下错误不断弹出：

如果models.py中使用了中间自定义类代码

name 'SelectMultiple' is not defined

如果自定义类代码从models.py中去掉：

No form field implemented for <class 'djangotoolbox.fields.ListField'>

Answer 1

您只需要通过它的声音导入 SelectMultiple。您可以将代码放在这三个文件中的任何一个中，fields.py 会有意义。

因为它很常见：

from django import forms

在您的文件顶部，您可能只想将以下代码编辑为：

# you'll have to work out how to import the Mongo ListField for yourself :)
class ModelListField(ListField):
    def formfield(self, **kwargs):
    return FormListField(**kwargs)

class ListFieldWidget(forms.SelectMultiple):
    pass

class FormListField(forms.MultipleChoiceField):
    """
    This is a custom form field that can display a ModelListField as a Multiple Select GUI element.
    """
    widget = ListFieldWidget

    def clean(self, value):
    #TODO: clean your data in whatever way is correct in your case and return cleaned data instead of just the value
    return value

您可能还想尝试了解更多有关 python 工作原理、如何导入模块等的知识。