在Django管理后台模型表单中添加动态字段
我需要在我的网站上把一个链接字段添加到Django的管理界面中。 当我把字段名称加到 list_display 里，并定义一个方法来显示这个链接时：
class SetAdmin(admin.ModelAdmin):
list_display = ['many other fields', 'show_set_url']
def show_set_url(self, obj):
return '<a href="#">Set</a>' # render depends on other fields
它在Django管理界面的列表中显示出来了，但在模型表单中却没有。 我该怎么做才能在Django管理界面的Sets表单中添加这个链接呢？
我也尝试为这个模型创建一个自定义表单：
from core.models import Set
from django import forms
class SetAdminForm(forms.Form):
class Meta:
model = Set
def __init__(self, *args, **kwargs):
super(SetAdminForm, self).__init__(*args, **kwargs)
self.fields['foo'] = forms.IntegerField(label=u"Link")
但是在表单中没有看到任何效果。
4 个回答
3
我在使用Django 1.9处理内联模型时，对所有这些答案都感到困惑。
这里有一段代码示例，帮我实现了动态字段。在这个例子中，我假设你已经有一个叫做ProductVariant的模型，它和一个叫做Product的模型有外键关系：
class ProductVariantForm(forms.ModelForm):
pass
class ProductVariantInline(admin.TabularInline):
model = ProductVariant
extra = 0
def get_formset(self, request, obj=None, **kwargs):
types = ( (0, 'Dogs'), (1, 'Cats'))
#Break this line appart to add your own dict of form fields.
#Also a handy not is you have an instance of the parent object in obj
ProductVariantInline.form = type( 'ProductVariantFormAlt', (ProductVariantForm, ), { 'fancy_select': forms.ChoiceField(label="Animals",choices=types)})
formset = super( ProductVariantInline, self).get_formset( request, obj, **kwargs)
return formset
class ProductAdmin(admin.ModelAdmin):
inlines = (ProductVariantInline, )
我具体的需求是，ProductVariant有一个多对多的关系，但这个关系的选择应该根据业务逻辑的分组来限制。因此，我需要在内联中使用自定义的动态字段。
4
你需要把它添加到 readonly_fields 列表里。
class SetAdmin(admin.ModelAdmin):
list_display = ['many other fields', 'show_set_url']
readonly_fields = ['show_set_url']
def show_set_url(self, obj):
return '<a href="#">Set</a>' # render depends on other fields
4
你可以使用表单的元类来创建动态字段和字段集。下面给出了示例代码。根据你的需求添加循环逻辑。
class CustomAdminFormMetaClass(ModelFormMetaclass):
"""
Metaclass for custom admin form with dynamic field
"""
def __new__(cls, name, bases, attrs):
for field in myloop: #add logic to get the fields
attrs[field] = forms.CharField(max_length=30) #add logic to the form field
return super(CustomAdminFormMetaClass, cls).__new__(cls, name, bases, attrs)
class CustomAdminForm(six.with_metaclass(CustomAdminFormMetaClass, forms.ModelForm)):
"""
Custom admin form
"""
class Meta:
model = ModelName
fields = "__all__"
class CustomAdmin(admin.ModelAdmin):
"""
Custom admin
"""
fieldsets = None
form = CustomAdminForm
def get_fieldsets(self, request, obj=None):
"""
Different fieldset for the admin form
"""
self.fieldsets = self.dynamic_fieldset(). #add logic to add the dynamic fieldset with fields
return super(CustomAdmin, self).get_fieldsets(request, obj)
def dynamic_fieldset(self):
"""
get the dynamic field sets
"""
fieldsets = []
for group in get_field_set_groups: #logic to get the field set group
fields = []
for field in get_group_fields: #logic to get the group fields
fields.append(field)
fieldset_values = {"fields": tuple(fields), "classes": ['collapse']}
fieldsets.append((group, fieldset_values))
fieldsets = tuple(fieldsets)
return fieldsets