Django 管理动态表单字段填充

Question

我的游戏模型在分类模型上具有 ManyToMany 关系有多种类型（PLATFORM、GENRE、FEATURE 等）

class Game(models.Model):
    taxonomy = models.ManyToManyField(Taxonomy)

class Taxonomy(models.Model):
    TAXONOMY_ORDER = [
        'PLATFORM',
        'GAME_PROCESS',
        'GRAPHICS',
        'GENRE',
        'CATEGORY',
        'FEATURE'
    ]
    type = models.CharField(choices=TAXONOMY_TYPES.items(), max_length=15)

我想从管理中删除 taxonomy 字段并从 TAXONOMY_ORDER

中为每个分类类型添加单独的 MultiplueChoises 字段

class GameAdminForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        super(GameAdminForm, self).__init__(*args, **kwargs)
        taxonomy_active = kwargs['instance'].taxonomy.all().values_list('id', flat=True)

        for tax_type in Taxonomy.
            self.fields['taxonomy_' + tax_type] = forms.MultipleChoiceField()
            self.fields['taxonomy_' + tax_type].queryset = Taxonomy.objects.filter(type=tax_type)
            self.Meta.fields.append('taxonomy_' + tax_type)
            self.initial['taxonomy' + tax_type] = Taxonomy.objects.filter(
                                                    id__in=taxonomy_active,
                                                    type=tax_type
                                                ).values_list('id', flat=True)

class GameAdmin(admin.ModelAdmin):
    form = GameAdminForm

    def get_fieldsets(self, request, obj=None):
        fieldsets = super(GameAdmin, self).get_fieldsets(request, obj)

        for tax_type in Taxonomy.TAXONOMY_ORDER:
            fieldsets[0][1]['fields'] += ['taxonomy_' + tax_type]

        return fieldsets

我有两个问题：

当我尝试动态添加字段时收到错误

Unknown field(s) (taxonomy_FEATURE, taxonomy_PLATFORM, taxonomy_CATEGORY, taxonomy_GRAPHICS, taxonomy_GENRE, taxonomy_GAME_PROCESS) specified for Game. Check fields/fieldsets/exclude attributes of class GameAdmin.

当我尝试显式添加自定义字段时，它们呈现为空白

class GameAdminForm(forms.ModelForm):
    taxonomy_PLATFORM = forms.MultipleChoiceField()
    taxonomy_GAME_PROCESS = forms.MultipleChoiceField()
    taxonomy_GRAPHICS = forms.ChoiceField()
    taxonomy_GENRE = forms.MultipleChoiceField()
    taxonomy_CATEGORY = forms.MultipleChoiceField()
    taxonomy_FEATURE = forms.MultipleChoiceField()

    def __init__(self, *args, **kwargs):
        ***__init__ stuff***

Answer 1

我发现用数据解决动态 MultipleChoiceField 填充很热门，但仍在寻找将自定义动态字段添加到 ModelForm 的合适解决方案。

要使用现有值填充 MultipleChoiceField，我们需要在初始化时传递 choises：
```
forms.MultipleChoiceField(choices=choises)
```
要以动态方式做到这一点，我们需要将我们的字段添加到 __init__
中的 self.fields
```
self.fields['dynamic_field_name'] = forms.MultipleChoiceField(choices=choises)
```

传递selected值：

self.initial['dynamic_field_name'] = initial_value

完整代码：

class GameAdminForm(forms.ModelForm):
    dynamic_field = forms.MultipleChoiceField()

    def __init__(self, *args, **kwargs):
        super(GameAdminForm, self).__init__(*args, **


        choises = Taxonomy.objects.all().values_list('id', 'name')
        self.fields['dynamic_field'] = forms.MultipleChoiceField(choices=choises)
        self.initial['dynamic_field'] = active_id_list

    class Meta:
        model = Game
        fields = '__all__'


class GameAdmin(admin.ModelAdmin):
    form = GameAdminForm
    exclude = ['rating', '_id']

admin.site.register(Game, GameAdmin)

Answer 2

我没有评论代表，所以这必须是一个答案。我一直在尝试为我自己的项目解决同样的问题，我找到的最好的解决方案是 chadgh 的这个自我回答的问题：.

我已经在我的代码中尝试过这种方法。它工作得很好，我认为它完全符合您的要求。唯一需要注意的是

def get_form(self, request, obj=None, **kwargs):
    kwargs['fields'] = flatten_fieldsets(self.declared_fieldsets)
    return super(PersonAdmin, self).get_form(request, obj, **kwargs)

self.declared_fieldsets 从 Django 1.7 开始被弃用。我改用 self.fieldsets 并且效果很好。

主要困难是 ModelAdmin 通常在实例化之前从表单 class 中获取字段，在表单的 __init__ 执行之前，因此它看不到动态字段。这就是为什么你必须覆盖 ModelAdmin.get_form.

Django 管理动态表单字段填充

Django admin dynamic form fields population

django

django-models

django-forms

django-admin

custom-fields