我想创建一个模型,在创建时设置editable = False,在编辑项目时设置editable = True。我认为它应该是这样的:
home = models.ForeignKey(Team, editable=lambda self: True if self.id else False)
但它不起作用。也许覆盖 init 的东西可以帮助我,但我不知道什么可以做到这一点。我知道我可以在save()方法中检查self.id,但为时已晚,我在填充字段时想要在管理应用程序中使用这种逻辑。
答案 0 :(得分:4)
将以下内容(this code的小扩展名)添加到您的admin.py:
from django import forms
class ReadOnlyWidget(forms.Widget):
def __init__(self, original_value, display_value):
self.original_value = original_value
self.display_value = display_value
super(ReadOnlyWidget, self).__init__()
def render(self, name, value, attrs=None):
if self.display_value is not None:
return unicode(self.display_value)
return unicode(self.original_value)
def value_from_datadict(self, data, files, name):
return self.original_value
class ReadOnlyAdminFields(object):
def get_form(self, request, obj=None):
form = super(ReadOnlyAdminFields, self).get_form(request, obj)
fields = getattr(self, 'readonly', [])
if obj is not None:
fields += getattr(self, 'readonly_on_edit', [])
for field_name in fields:
if field_name in form.base_fields:
if hasattr(obj, 'get_%s_display' % field_name):
display_value = getattr(obj, 'get_%s_display' % field_name)()
else:
display_value = None
form.base_fields[field_name].widget = ReadOnlyWidget(getattr(obj, field_name, ''), display_value)
form.base_fields[field_name].required = False
return form
然后,您可以在编辑对象时指定某些字段应该只读:
class PersonAdmin(ReadOnlyAdminFields, admin.ModelAdmin):
readonly_on_edit = ('home',)
admin.site.register(Person, PersonAdmin)