下面是我做的。
我需要这样做,因为我有一个模型将信息存储为键值对,我需要在该模型上构建ModelForm,但ModelForm应该将键值对显示为字段,即将行转到列。默认情况下,模型的get()
方法总是返回自己的模型实例,我需要使用自定义模型。下面是我的键 - 值对模型看起来像:
class Setting(models.Model):
domain = models.ForeignKey(Domain)
name = models.CharField(null=False, max_length=255)
value = models.CharField(null=False, max_length=255)
objects = SettingManager()
我建立了一个自定义的经理在这个覆盖get()
方法:
class SettingManager(models.Manager):
def get(self, *args, **kwargs):
from modules.customer.proxies import *
from modules.customer.models import *
object = type('DomainSettings', (SettingProxy,), {'__module__' : 'modules.customer'})()
for pair in self.filter(*args, **kwargs): setattr(object, pair.name, pair.value)
setattr(object, 'domain', Domain.objects.get(id=int(kwargs['domain__exact'])))
return object
该经理将实例化这个抽象模型的实例。 (抽象模型没有表,以便Django不扔了错误)
class SettingProxy(models.Model):
domain = models.ForeignKey(Domain, null=False, verbose_name="Domain")
theme = models.CharField(null=False, default='mytheme', max_length=16)
message = models.CharField(null=False, default='Waddup', max_length=64)
class Meta:
abstract = True
def __init__(self, *args, **kwargs):
super(SettingProxy, self).__init__(*args, **kwargs)
for field in self._meta.fields:
if isinstance(field, models.AutoField):
del field
def save(self, *args, **kwargs):
with transaction.commit_on_success():
Setting.objects.filter(domain=self.domain).delete()
for field in self._meta.fields:
if isinstance(field, models.ForeignKey) or isinstance(field, models.AutoField):
continue
else:
print field.name + ': ' + field.value_to_string(self)
Setting.objects.create(domain=self.domain,
name=field.name, value=field.value_to_string(self)
)
该代理具有的一切,我想在我的ModelFom显示并存储为在我的模型键值对的领域。现在,如果我需要添加更多的字段,我可以简单地修改这个抽象模型,而不必编辑实际模型本身。现在,我有一个模型,我可以简单地在其上构建的ModelForm像这样:
class SettingsForm(forms.ModelForm):
class Meta:
model = SettingProxy
exclude = ('domain',)
def save(self, domain, *args, **kwargs):
print self.cleaned_data
commit = kwargs.get('commit', True)
kwargs['commit'] = False
setting = super(SettingsForm, self).save(*args, **kwargs)
setting.domain = domain
if commit:
setting.save()
return setting
我希望这有助于。它需要通过API文档进行大量挖掘才能弄清楚。