Django - 在管理界面中的內聯表單中添加一個額外的字段

Question

假設我在admin.py中有以下內容：

class ImageInline(admin.TabularInline):
    model = Image

class ObjectAdmin(admin.ModelAdmin):
    inlines = [ ImageInline, ]

如何向ImageInline添加一個不是Image模型中的字段的額外字段？

Answer 1

與使用普通 ModelAdmin 的方法相同。 InlineModelAdmin 可以接受表單屬性， 它在 docs 中提到。 因此，創建一個自定義表單，在您的內聯中添加您想要的額外字段：

class ImageInline(admin.TabularInline):
   model = Image
   form = MyCustomForm

Answer 2

8年后，接受的答案將不起作用。

例如，在Django-2.2.3的以下設置中呈現MyInlineForm中的自定義表單字段：

class MyInlineAdmin(admin.StackedInline):
    model = MyInlineModel
    form = MyInlineForm

@admin.register(MyModelAdmin)
class MyModelAdmin(admn.ModelAdmin):
    inlines = (MyInlineAdmin,)

受@santhoshnsscoe啟發，這可以通過覆蓋ModelFormMetaclass.__new__來實現：

解決方案1：

from django.forms.models import ModelFormMetaclass


class MyModelFormMetaclass(ModelFormMetaclass):
    def __new__(cls, name, bases, attrs):
        for field in ['test_1', 'test_2', 'test_3']:
            attrs[field] = forms.CharField(max_length=30)
        return super().__new__(cls, name, bases, attrs)


class MyInlinelForm(forms.ModelForm, metaclass=MyModelFormMetaclass):
    class Meta:
        model = MyInlineModel
        fields = '__all__'

查看相關代碼， ModelFormMetaclass繼承自DeclarativeFieldsMetaclass ，其中attrs被傳遞給表單的declared_fields ：

for key, value in list(attrs.items()):
    if isinstance(value, Field):
        current_fields.append((key, value))
        attrs.pop(key)
attrs['declared_fields'] = OrderedDict(current_fields)

基於這一觀察，並遵循ModelAdmin.get_formsets_with_inlines的相關文檔，我嘗試使用ModelAdmin的該方法豐富declared_fields的字段，它也有效：

解決方案2：

class MyInlineForm(forms.ModelForm):
    class Meta:
        model = MyInlineModel
        fields = '__all__'

class MyInlineAdmin(admin.StackedInline):
    model = MyInlineModel
    form = MyInlineForm

@admin.register(MyModelAdmin)
class MyModelAdmin(admn.ModelAdmin):
    inlines = (MyInlineAdmin,)

def get_formsets_with_inlines(self, request, obj=None):
    for inline in self.get_inline_instances(request, obj):
        if isinstance(inline, MyInlineAdmn):
            for field in ['test_1', 'test_2', 'test_3']:
                inline.form.declared_fields[field] = forms.CharField(max_length=30)

        yield inline.get_formset(request, obj), inline

Answer 3

class ReactionInline(admin.StackedInline):

    model = Reaction

    def formfield_for_dbfield(self, db_field, request, **kwargs):

        if db_field.name == "reaction":

            from fb_post.constants.enums import Reactions
            select_choices = [('None', None)] + Reactions.get_list_of_tuples()

            kwargs['widget'] = forms.Select(choices=select_choices) # the other case for ModelAdmin "kwargs['widget'].choices = select_choices" this would work

        return super(ReactionInline, self).formfield_for_dbfield(db_field, request, **kwargs)

用於在管理面板上為應用模型的枚舉字段（比如反應）添加下拉菜單功能，用於擴展 StackedInline 或 TabularInline 類的類； 這會奏效。 另一種情況的解決方案，擴展 ModelAdmin 的類也在評論中給出

Answer 4

使用“extra_field”創建“CustomImageForm”類並將其設置為“ImageInline”類，如下所示：

# "admin.py"

from django.contrib import admin
from django import forms
from .models import Image, ObjectAdmin

# Here
class CustomImageForm(forms.ModelForm):
    extra_field = forms.CharField()
    
class ImageInline(admin.TabularInline):
    model = Image
    form = CustomImageForm # Here

@admin.register(ObjectAdmin)
class ObjectAdmin(admin.ModelAdmin):
    inlines = [ImageInline,]